Adaptec AHA-2742A, AHA-2742A-TWIN User Manual

AHA-2740/2742

Single-Channel

AHA-2740T/2742T

TwinChannel EISA-to-Fast SCS I Host Adapters

User’s Manual

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page A-1) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93

Adaptec, Inc.

691 South Milpitas Boulevard Milpitas, CA 95035

Printed in Singapore

STOCK NO.: 510381-00 Rev. C LL 9/93 Information subject to change without notice.

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page A-2) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93

AHA-2740/2742

Single-Channel

AHA-2740T/2742T

TwinChannel EISA-to-Fast SCS I Host Adapters

User’s Manual

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Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 0-i) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93

Copyright © 1993 Adaptec, Inc. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means; electronic, mechanical, photocopying, recording or otherwise, without the prior written consent of Adaptec, Inc., 691 South Milpitas Blvd., Milpitas, CA 95035.

Trademarks

All product names mentioned below and in this manual are trademarks or registered tradem arks o f th eir re spec tive ow ners .

Adaptec and the Adaptec logo are registered trademarks, and AHA, TwinChannel, and PhaseEngine are trademarks of Adaptec, Inc.

AT&T is a registered trademark of American Telephone and Telegraph Company. Bernoulli is a registered trademark of Iomega Corporation. IBM, OS/2, AT, and Micro Channel are registered trademarks of International Busi-

ness Machines Corporation. MS-DOS is a registered trademark of Microsoft Corporation. NetWare is a registered trademark of Novell, Inc. SCO is a registered trademark of the Santa Cruz Operation, Inc.. UNIX is a registered trademark and USL is a trademark of Unix Systems Laboratories.

Changes

The material in this manual is for information only and is subject to change without notice. While reasonable efforts have been made in the preparation of this manual to assure its accuracy, Adaptec, Inc. assumes no liability resulting from errors or omissions in this manual, or from the use of the information contained herein.

Adaptec reserves the right to make changes in the product design without reservation and without notification to its users.

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 0-ii) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93

FCC Compliance Statement

NOTE: This equipment has be en tested and foun d to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in residential installations. This equipment generates, uses, and can radiate radio frequency energy, and if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation.

If this equipment does cause interference to radio or television equipment reception, which can be determined by turning the equipment off and on, the u ser is encouraged to try to correct the interference by one or more of the following measures:

Reorient or relocate th e receivi ng ant enna

•

Move the equipment aw ay from the rec eiver

•

Plug the equipment into an ou tlet on a circuit differen t from that to

•

which t he re cei ver is pow ere d If necessary, th e user s hou ld cons ult the deal er or an exp eri enc ed

•

radio/television technician for additional suggestions

CAUTION: Only equipment certified to comply with Class B (computer input/output devices, terminals, printers, etc.) should be attached to this equipment, a nd must have shielded interface cables.

Finally, any change or modifications to the equipment by the user not expressly approved by the grantee or manufacturer could void the user’s authority to operate such equipment.

Each AHA-2740 Series host adapter is equipped with an FCC compliance label which shows only the FCC identification number. The full text of the associated label follows:

This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference and (2) this device must accept any interference received, including interference that may cause undesired operation.

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Table of Contents

Preface

Inside This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi

Con v entio n s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii

Advisories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii

Introduction

About This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Ove rv i ew. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1- 3

The AHA-2740 Series of Host Adapters . . . . . . . . . . . . . . . . 1-3

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Fast Data Transfer Rates . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Maximum Off-load ing the Host CPU. . . . . . . . . . . . . . . 1-4

Fully Disk Array Capable. . . . . . . . . . . . . . . . . . . . . . . . 1-5

Advanced Fast SCSI-2 Implementa tion. . . . . . . . . . . . . 1-5

Multiple Device and Application s Suppor t . . . . . . . . . . 1-5

Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Default Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

The On-board Floppy Contr oller

(AHA-2742/2742T Only) . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Unp ackin g an d Inspectio n. . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Adaptec Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

Getting Started

About This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

The Host Adapter and the SCSI Bus . . . . . . . . . . . . . . . . . . 2-4

Quick Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Prepare Your SCSI Devic es . . . . . . . . . . . . . . . . . . . . . . 2-5

Install Your Host Adapter and Peripherals. . . . . . . . . . 2-6

Configure the Host Adapter . . . . . . . . . . . . . . . . . . . . . . 2-7

Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Termination on the SCSI Bus. . . . . . . . . . . . . . . . . . . . . 2-9

SCSI ID Sett i n g. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2- 12

Board Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

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AHA-2740 Series User’s Manual

SCSI Bus Activity LED Con n ecto r . . . . . . . . . . . . . . . 2-14

Con n ectin g Periphera ls . . . . . . . . . . . . . . . . . . . . . . . . 2-15

Before Re-booting Your System. . . . . . . . . . . . . . . . . . 2-23

Reassemble the System . . . . . . . . . . . . . . . . . . . . . . . . 2-23

Configuring the Host Adapter

About This Chapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

The EISA Configuration Utility. . . . . . . . . . . . . . . . . . . . . . 3-3

Run the EISA Configuration Utility . . . . . . . . . . . . . . . 3-4

Copy Configur ation and Ove rlay Files . . . . . . . . . . . . . 3-4

Select the Host Adapter . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Configure the Host Adapter Parameters . . . . . . . . . . . 3-5

BIOS and Device Config u ration. . . . . . . . . . . . . . . . . . 3-1 2

Exit the EISA Configuration Utility . . . . . . . . . . . . . . 3-19

Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19

Disk Format Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20

Host Adapter Diagnostic Utility . . . . . . . . . . . . . . . . . 3-21

Troubleshooting

About This Chapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

SCSI Troubleshooting Checklist . . . . . . . . . . . . . . . . . . . . . 4-3

Problems and Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Conflicts With Other Option s. . . . . . . . . . . . . . . . . . . . . . . . 4-7

APPENDICES

Specifications

About This Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Technical Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3

Product Specific ations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3

Extended In dustr y- Standar d Ar chitec tur e Inter fac e . . . . . A-4

SCSI Interfac e. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Electrical Inte rface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Floppy Disk Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8

Standard Electro nic and Physical Inter fac e . . . . . . . . . A-8

Con n ector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8

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I/O Operating Environment

About This Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Host Adapter Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

DOS/Win d ows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

Optimizing Performance

About This Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

Performance Tips. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3

Enabling Synchronou s Negotiation . . . . . . . . . . . . . . . . C-3

Disabling the Host Adapter BIOS . . . . . . . . . . . . . . . . . C-3

Enabling SCSI Bus Parity . . . . . . . . . . . . . . . . . . . . . . . C-4

Setting Enable Disconnection. . . . . . . . . . . . . . . . . . . . . C-4

Send Start Unit Command . . . . . . . . . . . . . . . . . . . . . . . C-4

DOS/Window s Perf or manc e . . . . . . . . . . . . . . . . . . . . . . C-5

Table of Cont ent s

Disk Drives Over 1 Gigabyte

About This Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1

Extended Translation (Using DOS 5.0) . . . . . . . . . . . . . . . . D-3

The DOS 1 Gigabyte Limit . . . . . . . . . . . . . . . . . . . . . . . . . . D-3

When to Use Extended Translation . . . . . . . . . . . . . . . . . . . D-4

With DOS Version 5 Only. . . . . . . . . . . . . . . . . . . . . . . . D-4

Drives With Mixed Partition s. . . . . . . . . . . . . . . . . . . . . D-4

Using Fdisk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-4

Questions and Answers About Exten de d Translation. . . . . D-5

Glossary

About This Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . Glossary-1

Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Glossary-3

Index

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Index-1

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AHA-2740 Series User’s Manual

List of Figures

Figure 1-1. Host Adapter Board Layou t . . . . . . . . . . . . . . . . 1-6

Figure 2-1. Connec tor s on the Host Adapter . . . . . . . . . . . . . 2-8

Figure 2-2. Inter n al and Ex tern al De vice s . . . . . . . . . . . . . . 2-9

Figure 2-3. Inter n al Dev ic es On ly. . . . . . . . . . . . . . . . . . . . 2-10

Figure 2-4. Exter n al Dev ic es On ly. . . . . . . . . . . . . . . . . . . . 2-10

Figure 2-5. SCSI LED Conn ector. . . . . . . . . . . . . . . . . . . . . 2-14

Figure 2-6. Connec tin g Cable to Internal Conn ector . . . . . 2-17

Figure 2-7. Connec tin g Cable to SCSI Device. . . . . . . . . . . 2-17

Figure 2-8. Connec tin g a Second In ter nal SC SI Devic e. . . 2-18 Figure 2-9. Connectin g Extern al Cable to Host Adapter. . 2-19 Figure 2-10. Connectin g External Cable to SC SI Device. . 2-19 Figure 2-11. Connec tin g Multiple Exter nal SC SI Devic es. 2-20 Figure 2-12. Connecting Floppy Cable to Host Adapter. . . 2-21 Figure 2-13. Connec tin g Floppy Cable to Floppy Driv e. . . 2-22

Figure 2-14. Connec tin g a Second Floppy Drive. . . . . . . . . 2-22

Figure 3-1. Host Adapter Parameter s. . . . . . . . . . . . . . . . . . 3-5

Figure 3-2. Selectin g Interr up t Level . . . . . . . . . . . . . . . . . . 3-6

Figure 3-3. Selectin g Bus Relea se Time . . . . . . . . . . . . . . . . 3-7

Figure 3-4. Selectin g Data FIFO Thresh old . . . . . . . . . . . . . 3-7

Figure 3-5. Selecting Host Adapter BIOS Base Addres s . . . 3-8

Figure 3-6. Selectin g Hos t Adapter SCSI ID . . . . . . . . . . . . 3-9

Figure 3-7. Selectin g SCSI Bus Parity . . . . . . . . . . . . . . . . 3-10

Figure 3-8. Selectin g SCSI Selection Timeout . . . . . . . . . . 3-11

Figure 3-9. Selectin g SCSI Bus Reset at Power-on . . . . . . 3-11

Figure 3-10. Conf igur in g SCSI Bus Termin ation. . . . . . . . 3-12

Figure 3-11. BIOS and Device Conf igur ation. . . . . . . . . . . 3-12

Figure 3-12. BIOS Con fig ur ation Selection . . . . . . . . . . . . . 3-1 3

Figure 3-13. SCSI Device Con figu ration. . . . . . . . . . . . . . . 3-15

Figure 3-14. Exiting SCSI Devic e Configur ation . . . . . . . . 3-1 9

Figure 3-15. Utility Selection. . . . . . . . . . . . . . . . . . . . . . . . 3-20

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List of Tables

Table 1-1. Host Adapter Components . . . . . . . . . . . . . . . . . . 1-7

Table 1-2. Host Adapter Default Settings. . . . . . . . . . . . . . . 1-7

Table 2-1. SCSI Device and AHA Configu r ation . . . . . . . . . 2-9

Table A-1. Standard EISA Bus Electronic and

Physical Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Table A-2. Output Signals . . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Table A-3. Input Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5

Table A-4. Internal Connector Pin Assignmen ts . . . . . . . . A-6

Table A-5. External Connec tor Pin Assignme nts. . . . . . . . A-7

Table A-6. Output and Input Signals . . . . . . . . . . . . . . . . . A-8

Table of Cont ent s

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 0-ix) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 0-x) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93

Preface

Inside This Manual

This manual provides complete in stru ction s on how to install and use the Adaptec AHA-2740 Series of EISA-to-Fast SCSI Host Adapters.

Chapter 1, Introdu c tion, provid es gener al in fo rmation about the Adaptec AHA-2740 Series of host adapters. The features, board layout, and default settings are inclu ded. It also tells you how to contact Adaptec Technical Support.

Chapter 2, Getting Started, has the information needed to install the host adapter and SCSI devices.

Chapter 3, Configuring the Host Adapter, describes the EISA Configuration utility and how it is used to configu re your host adapter. The chapter also describes the utilities available through the EISA Configuration utility.

Chapter 4, Trouble s h ooting, has information to assist you in troubleshooting pro blems th at may occu r dur ing installation and configuration.

Appendi x A, Specifications, lists technical spec ific ation s of the host adapter and its connecto rs, which may be of use to the advanced user or technic ian .

Appendi x B, I/O O pe ra tin g Env ir on men t , prov ides info rmation on using your host adapter with variou s opera ting sys tems, such as DOS/Windows. A brief discussion on Adaptec’s EZ-SCSI I/O Operating Env ironment Softwar e is a lso inc luded.

Appendi x C, Op timizing Performan ce , has various tips on maximizing the performan c e of your host adapter.

Appendi x D, Disk Driv e s Ove r 1 Giga byte , describes Adaptec’s extended translation feature which allows you to bypass the DOS 1024 cylinder lim it, and supp orts disk drive s up to 8 Gigaby tes (GBytes) in size.

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 0-xi) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93

AHA-2740 Series User’s Manual

The Glossary has definitions of spec ial terms used in this manu al and in SCSI literature in general.

The In de x h elps you locate specific information qu ickly.

Conventions

The following typog raph ic c on ventions are used throu ghou t this User’s Manual.

bold

Used for keystrokes (.. press the Enter key ..) and screen selection fields (.. select Backup Device and ..).

Helvetica

Used for operator entry that must be typed exac tly as shown ( .. device=c:\adaptec\aspidos.s ys ..) and for screen messages (..Enter Password ..).

Helvetica Italics

Used as a place holder for text you must determine and type in

(..

enter nn for number ..). Also used for program and file names

in body text (.. the

autoexec.bat

file ..).

Italics

Used for emphasis (.. is only supported ..) and docu men t r eference (.. refer to Chapter 2, Setting Up ..).

ALL CAPITALS Used for acronyms, such as SCSI and CD-ROM.

Hexadecimal Numbers Are followed by an ‘h’ , e.g., 330h.

Numbered Step Marker The

➤ symbol marks the first in a series of numbered steps.

End Mark The

❒ symbol marks the end of the text for each chapter.

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Preface

Advisories

Advisories are quick notes that stress an importan t point or warn of a potential hazard to the system, data, and/or the user. This manual uses three types of advisor ies whic h are as follows:

Note

Text set off in this way presents reminder, tips, or suggestions which may simplify the assembly an d use of the host adapter.

Caution

Failure to observe this type of advisory could result in damage to your system, devices, and/or data.

WARNING

This type of advisory is a visual alarm. Failure to observe this type of advisory could result in injury to the user.

❒

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Introduction

About This Chapter

Read this chapter to find out:

An overview of the AHA-2740 Series of EISA-to-Fast

•

SCSI host adapters The features of the AHA-2740 Series

•

The layout of the host adapter and all its major

•

components The default settings of the host adapter and how to

•

disable or enable the on-board floppy controller How to get help from Adaptec Technical Suppor t

•

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 1-1) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93

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Overview

This user’s manual prov ides info rmation on how to install and configure the AHA-2740 and AHA-2742 single-ch annel, and the AHA-2740T and AHA-2742T TwinChannel EISA-to-Fast SCSI host adapters in an EISA comp uter system.

The AHA-2740 and AHA-2742 support a single SCSI channel (SCSI Channel A), while the AHA-2740T and AHA-2742T support Adaptec’s TwinCh an n el (SCSI Channel A and S CSI Chan nel B) architecture. Procedures for all adapters are the same except when regarding the on-board flop py controller on both the AHA-2742 and AHA-2742T .

In this manual, the AHA-2740 and AHA-2742 are referred to jointly as the AHA-2740/2742 host adapter; the AHA-2740T and AHA-2742T are referred to jointly as the AHA-2740T/2742T ho st adapter. Cumulatively, all four host adapters are referred to as the AHA-2740 Series.

The AHA-2740 Series of Host Adapters

The AHA-2740 Series provides a high performanc e c onne ction between the EISA (Extended Industry Standar d Architec tur e) bus and the SCSI (Small Computer System Interface) bus. The AHA-2740 Series is a bus master device that transfers data into host memory at burst rates of 33 MBytes/sec. These transfers are generally 32 bits wide, except when transfe rrin g data into 8- or 16-bit memory.

Bus mastering minimizes host CPU overhead, since the AHA2740 Series has an on-board sequencer (SCSI PhaseEngin e) that allows it to independently manag e data transfer between SCSI devices and the comp uter system me mor y, with ou t requiring the involvement of the CPU. This is the highest performance type of data transfer available for the EISA bus in multi-tasking operating systems.

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AHA-2740 Series User’s Manual

The AHA-2740 Series supports only sing le-en ded SCSI devic es. Most of the SCSI drives on the market today are of this type.

Like all EISA I/O cards, the AHA-2740 Series does not have jumpers to change various EISA configur ation options. These options are changed via the EISA Configuration utility provided with every EISA system; however, the AHA-2742/2742T does have a single jumper (J4) that is used to enable or disable the on-board floppy controller.

Features

Fast Data Transfer Rates

Up to 33 MBytes/sec on EISA bus

•

2.0 MBytes/sec asynch ro nous SCSI data rate

•

5.0 MBytes/sec synch rono us SCSI data rate

•

10.0 MBytes/sec synchrono us Fast SCSI data rate

•

Maximum Off-loading the Host CPU

On-board sequencer (SCSI PhaseEngine) automates all SCSI

•

protocol Low SCSI processing overhe ad

•

Bus master DMA implementation

•

Task scheduling and message-based co mmunic ation

•

Programmable interrupts

•

32-, 16-, and 8-bit host bus d ata transfer

•

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Fully Disk Array Capable

Able to boot from any drive on the SCSI bus

•

Background processing permits smooth error recovery

•

Extensive supp or t from leading disk array ven dor s

•

Advanced Fast SCSI-2 Implementation

Concurrent support of Fast SCSI, synchronous and

•

async h ronous devic e s Concurrent support of both standard and Fast SCSI devices

•

Scatter/Gather operation

•

Simultaneous Target/Initiator

•

Fully multitasking/multithreading

•

Uses the superior SCSI-2 (Alternative 1) external connector

•

and standard intern al ribbon connec tor

Introduction

Tagged queuing support

•

Programmable active SCSI termination

•

Multiple LUN support

•

Parity handling in Da ta, Message, and Command phases

•

Multiple Device and Applications Support

The AHA-2740/2742 can be used to install up to seven SCSI

•

devic e s The AHA-2740T/2742T can be used to install up to 14 SCSI

•

devic e s The AHA-2742/2742T can be used to install up to two floppy

•

diskette drives

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AHA-2740 Series User’s Manual

The AHA-2740 Series BIOS fully suppor ts the extended par ti-

•

tioning capabilities of DOS 3.3 for up to two drives and DOS

5.0 and above for up to seven drives per host adapter, eight total

The AHA-2740 Series supports both fixed and remov able

•

media devices with capacities above 1 Gigabyte (GByte) Managers and devic e modu le softwar e av ailable for all major

•

operating systems

Board Layout

Figure 1-1 shows the location of the major compon ent s on the host adapter; Table 1-1 provides a description of each compon ent.

J2J1 J4 J3U2U1 U5

1-6

PIN 1

Figure 1-1. Host Adapter Bo ard Lay out

PIN 1

U10U9 J6J5

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Introduction

Table 1-1. Host Adapte r Comp o nents

Location Description

J1 External LED Connector J2 Floppy Connector (AHA-2742/2742T only) J3 SCSI Channel A Internal Connec tor J4 Floppy Enable Jumper (AHA-2 742/2742T only) J5 SCSI Channel B Internal Connec tor

J6 SCSI Channel A External Connec tor U1 Floppy Controller (AHA-2742/2742T only) U2 RAM U5 Host Adapter BIOS U9 AIC-7770 Bus Master SCSI Chip U10 AIC-701 Configuration Chip

(AHA-2740T/2742T only)

Default Settings

Your host adapter i s already con fig u r ed for th e ma jority of EISA class computers. Table 1-2 lists the default settings of your host adapter. Refer to Chapter 3, Configuring the Host Adapter for information on changing any of the settings.

Table 1-2. Host Adapter Default Settings

Description Default Setting

Interrupt Level IRQ 11, Level

Bus Release Time 60 BCLKS Data FIFO Threshold 100% Host Adapter BIOS Base Address D8000h Host Adapter SCSI ID Device ID 7 SCSI Bus Parity Check Enabled SCSI Selection Time out 256 milli secon ds SCSI Bus Reset at Power- on Enabled SCSI Bus Termina tion Enabled Extended Trans lat ion for Drives > 1 GByte Enabled Suppor t More Than Tw o Dri ves Disabled Support Removable Disks as Fixed Disks Boot Device Only

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Sensitive

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AHA-2740 Series User’s Manual

The On-board Floppy Controller (AHA-2742/2742T Only)

The on-board floppy controller on the AHA-2742/2742T is enabled by default and is controlled by Jumper J4.

If your floppy diskette drives are alr eady runnin g under

•

another contro ller , disable the on-board flopp y controlle r by removing the jumper shunt on Jumper J4

To use the on-board floppy controller, leave the jumper

•

shunt installed on Jumper J4 and then disable your existing floppy controlle r; refer to your compu ter or floppy controller user documentation

Unpacking and Inspection

Your host adapter should be undamaged when you receive it. Th e carrier or distributor where you purc hased the host adapter is responsible for any damage incur red durin g storag e or shipmen t.

In case of damage, return the host adapter to your distribu tor ; if the host adapter was delivered to you directly, have the carr ier note the damage on both the delivery receipt and the freigh t bill, then notify the freight company representative so that the necessary insuranc e claims can be initiated.

Caution

The host ada pter is extrem ely sensiti ve to stati c electr ici ty ; even a mild shock can destroy a component on the board. Keep the host adapter in its conductive wrapping until you are ready to install it in your system. Before handling the host adapter, always ground you rself b y touchi ng the s ystem chas sis of your computer.

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Introduction

Adaptec Technical Support

The AHA-2740 Series has been specifically developed for easy installation and use. We hope that our manuals, and the onscreen instru ction s and help available in both the host adapter Configuration Softwar e and Ad aptec I/O Operatin g En vironmen t Software installation programs, are complete and clear enough to meet your needs. If you need furthe r help, plea se contact us.

The Adaptec Electronic Bulletin Board Ser vice (BBS)

•

provides infor mation on software upg rad es, new releases, technical adv ice , and other topics. The BBS can be reached 24 hours a day at 408-945-7727; 1200/2 400/9 6 00 baud, 8 data bits, 1 stop bi t, no parity.

The Adaptec Technical Suppo rt Hot Lin e can be reach ed

•

at 800-959-SCSI (7274) or 408-945-2550, M-Th: 6:00 a.m. to 5:00 p.m., F: 6:00 a.m. to 3:00 p.m., PST .

The Adaptec Technical Suppo rt FAX can be reac hed 24

•

hours a day at 408-945-6776.

❒

Adaptec software can be ordered by calling 800-442-7274,

•

M-F: 5:00 a.m. to 6:00 p.m. , PST. Additional documentation for Adaptec products can be

•

requested by calling 800-934-2766, M-F: 5:00 a.m. to 6:00 p.m., PST, or you can write to:

Adaptec, Inc. Literature Depar tmen t 691 South Milpitas Blvd. Milpitas, CA 95035

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Getting Started

About This Chapter

Read this chapter to find out:

An overview of the steps involved in installing your host

•

adapter A brief discussion on your host adapter and the SCSI bus

•

The instructions an experienced user can use to quickly

•

install the host adapter The instructions a user who is new to SCSI, or has lim-

•

ited experience, can use to install the host adapter and SCSI devices

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Installation Overview

This chapter provide s instr uction s that gu ide you thr oug h preparing SCSI device s for installation on the SCSI bus, installing the host adapter in the EISA system, connecting the devices to the SCSI bus, cabling and re-assembling the system.

For experien ced user s wh o are already familiar with SC SI and SCSI installation, refer to the Qu ick In st all ati on section in this chapter for instructions that allow you to get your host adapter up and running quickly.

If you are new to SCSI peripherals, or if you have limited experience installing option bo ard s in your compu ter, refer to the mo re comprehensive ins tructio ns and illustration s found in the Installation section o f t hi s chapter.

For a brief discussion on how your host adapter wor ks with other SCSI devices on the SCSI bus, refer to the following section The Host Adapte r and the SCSI Bus.

Installing your host adapter involves the following:

Terminating the S C SI bus

•

Setting the SCSI ID

•

Installing the host adapter board in the EISA system

•

Connecting cables and devices

•

Reassembling the system

•

Configuring the host adapter with the EISA Con f i guration

•

utility (described in Chapter 3)

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AHA-2740 Series User’s Manual

The Host Adapter and the SCSI Bus

The AHA-2740 Series acts on your computer’s behalf as the host to your suite of SCSI devices. Each chain of SCSI periph er al devices and their host adapter work together, and is referr ed to as a SCSI bus. When connecting SCSI device s to the SCSI bus, consider the following:

Each AHA-2740/2742 installed in your system can be

•

used to form a SCSI bus consisting of up to seven internal and external SCSI device s on its single-chan n el (SCSI Channel A).

Each AHA-2740T/2742T installed in your system can be

•

used to form two SCSI busses using its TwinCh an ne l architectu re (SCSI Channel A and SCSI Chann el B). SCSI Channel A can control u p to seven inter nal an d external SCSI devices, while SCSI Chann el B can contr ol up to seven internal SCSI devices only.

The number of host adapters installed in your system is

•

limited only by the number of available EISA slots that support bus master functions.

2-4

As with any standard bus, the wires in a SCSI cable

•

resemble transmission lines which can generate undesirable effects such as, signal reflec tion and uneven loadin g of the line drivers. To reduce the se effect s, the SCSI bus must be properly termin ated. (Ter mination on the SCSI bus is discussed in detail later in this chapter.)

To identify each SCSI device’s add ress, and to determine

•

its priority on the SCSI bus, each SC SI device (in c lud ing the host adapter) located on the SCSI bus mus t be set to a unique SCSI ID (0-7). (SCSI ID setting is discussed in detail later in this chapter.)

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Getting Start ed

Quick Installation

The following ins tallation procedu r es are inten de d to help exper ienced users quic kly install the AHA-2740 Series of host adapters into an EISA computer system.

If you are new to com p uter per iph er al installation or would like more inform atio n, ref er to the more co mpr ehen sive in str uctions and illustrations found in the Installation section of this chapter.

Prepare Your SCSI Devices

Before you physically install the host adapter and connect the SCSI devices, you must prepare your SCSI de vices for installation on the SCSI bus:

1 Terminate the endpoints of the SCSI bus.

➤

Identify whic h two SCSI devices (inc lu din g the host adapter) will form the physical endpoints of your SCSI bus. These devices at the ends of the SCSI bus must have a set of resistors called terminators either installed or enabled. All other SCSI devices installed between the ends of the SCSI bus must have their terminators either re mov ed or disabled.

Enabling or disabling host adapter termination is software selectable only. The factory installed bus terminators on the AHA-2740 Series are enabled by default.

To disable termin ation on the ho st adapter, refer to Chapter 3, Configuring the Host Adapter for instructions. Refer to the SCSI device documen t ation for infor m ation on enabling or disabling SCSI termination on other SCSI devices.

2 Verify that each SCSI device located on the SCSI bus is set to

a unique SCSI ID (0-7). The default value for your host adapter is SCSI ID 7. Refer to

Chapter 3, Configuring the Ho st Adapter for instruc tion s on changing the SCSI ID for the host adapter. Refer to the SCSI device documentation for info rmation on changin g the SCSI ID on other SCSI devices.

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AHA-2740 Series User’s Manual

Install Your Host Adapter and Peripherals

Once the SCSI bus is properly termin ated and each SCSI devic e is set to a uniqu e SCSI ID, you can physically install your host adapter and SCSI devices:

WARNING

Turn OFF and disconnect power to the system and external equipment before removing t he chassis cover or attempting any motherboard modifications.

1 Turn power off, unplu g your computer and r emov e the c over .

➤

2 Install the host adapter in an available EISA slot which

supports bus master operations (refer to the host system documentation for details).

3 For internal SCSI devic es, co nnec t one end of the 50-pin SC SI

ribbon cable to the internal connector on the host adapter; connect the oth er end to the conn ec tor on the inter nal SC SI device. Make sure to align Pin 1 of the cable with Pin 1 of the connectors on the host adapter and intern al SCSI device .

4 To connect a second intern al SCSI device, plu g the middle con-

nector of the SCSI ribbon cable to the conne ctor on the secon d internal SCSI device.

To connect additional intern al SCSI devices to a SCSI bus, you will need to obtain a 50-pin SCSI ribbon cable with enough connector s to acco mmodate all of your inter nal SC SI devices.

5 For external SCSI dev ic es, con ne ct on e end of the 50-pin

shielded cable to the external conn ector on the host adapter; connect the other end to one of the SCSI connectors of the external SCSI device. Extern al cable co nnector s are keyed and can only be plugged in one way.

To connect subsequent extern al SCSI devices, you will need to obtain additional shielded cables to chain the devices together.

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Getting Start ed

6 If you are using the floppy controller on the AHA-2742/2742T,

connect one end of the 34-pin floppy ribbon cable to the floppy connector on the host adapter; conn ect the othe r end to the connector on the first floppy drive (Drive A).

To connect a second floppy driv e, plug the middle conn ector of the floppy ribbon cable to the connector on the second flop py drive (Drive B).

7 Reinstall your cover and reco nnect all system and perip heral

power cables.

Configure the Host Adapter

All EISA computer systems are shipped with a software prog ram generally known as the EISA Configuration utility. Run the utility to configure your host adapter for operation in your EISA computer system. Chapter 3, Configuring your Host Adapter provides a comprehensiv e description of how the utility works; however, the basic steps inv olv ed inclu de the follow ing:

1 Run the EISA Configuration utility as instructed by the EISA

➤

system vendor.

2 Copy the

!adp7771.cfg

configuration file and

adp7770.ovl

overlay file needed to configure your host adapter with your EISA system from the diskette that came with your host adapter to either the bootable EISA Configuration diskette or to the directory on your hard disk where the utility is located.

3 Select the option in the utility that allows you configure the

EISA slot in which the host adapter is installed.

4 Configure the host adapter parameters.

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AHA-2740 Series User’s Manual

Installation

This section is intended primarily for users who are new to SCSI peripherals, or have limited experience in installing an option board in their computer system.

Note

Experienced users may want to refer to the Quick Installation section described earlier in this chapter.

The comprehen sive in str uction s in this section guide y ou thro ugh terminating the SCSI bus, setting the SCSI ID, installing the host adapter, and connecting peripherals and cables.

Once the host adapter is properly installed in your EISA system, you will have to configure it as explained in Chapter 3, Configuring the Host Adapter.

To assist you with installation, Figure 2-1 shows the location of all the connectors on the host adapter.

2-8

EXTERNAL LED

CONNECTOR

SCSI CHANNEL B INTERNAL CONNECTOR

(AHA-2740T/2742T ONLY)

FLOPPY CONNECTOR (AHA-2740T/2742T ONLY)

PIN 1

Figure 2-1. Connectors on the Ho st Adapte r

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PIN 1

SCSI CHANNEL A INTERNAL CONNECTOR

SCSI CHANNEL A

EXTERNAL CONNECTOR

Getting Start ed

Termination on the SCSI Bus

To reduce signal reflections on the SCSI bus, the first and last physical SCSI devices on the ends of the SCSI bus must hav e a set of resistors called terminat ors either installed or enabled. All other SCSI devices installed between the ends of the SCSI bus must have their terminators either removed or disabled. Improper termination of the SCSI bus results in erratic device operation or general bu s failure. Table 2-1 describes the three possible SCSI device and Adaptec Host Adapter (AHA) configurations.

Table 2-1. SCSI D ev ice and AH A Conf igu rati on

Devices Conne cte d To Host A dapter AHA Terminatio n

Internal and External devices (AHA in betw een ) Removed/Disabled Internal device s only (AH A at end of cable) Installed/ Enabl ed External device s only (AH A at end of cable) Installed/Enabled

Internal and External Device s

When both intern al and exter nal S C SI devices are conn ec ted to the host adapter, the last external device and the last internal device should be te rmin ated, as shown in Figur e 2-2.

INTERNAL DEVICE

TERMINATION

HOST ADAPTER

NO TERMINATION

EXTERNAL DEVICE

NO TERMINATION

INTERNAL DEVICE

NO TERMINATION

EXTERNAL DEVICE

NO TERMINATION

Figure 2-2. Internal and External Devic es

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ENABLED

EXTERNAL DEVICE

TERMINATION

ENABLED

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AHA-2740 Series User’s Manual

Internal Devices Only

When only internal devices are connected to the host adapter, the last device connected to the SCSI ribbon cable and the host adapter itself should be terminated, as shown in Figure 2-3.

INTERNAL DEVICE

TERMINATION

ENABLED

HOST ADAPTER

TERMINATION ENABLED

INTERNAL DEVICE

NO TERMINATION

Figure 2-3. Internal Devices Only

External Devices Only

When only external devices are connec ted to the host adapter, both the last device on the external chain of dev ic es and the hos t adapter itself should be terminated, as shown in Figure 2-4.

2-10

HOST ADAPTER

TERMINATION

ENABLED

EXTERNAL DEVICE

NO TERMINATION

EXTERNAL DEVICE

NO TERMINATION

EXTERNAL DEVICE

Figure 2-4. External Devices Only

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TERMINATION

ENABLED

Getting Start ed

Terminating the Host Adapte r

The factory installed bus terminators on the host adapter are enabled by defau l t. Host adapter termination should be di sabled only if you attach SCSI devic es to both inter nal an d exter n al connectors, since the host adapter would then be in the middle of the SCSI bus.

Enabling or disabling host adapter termination is software selectable only, and is done through your computer’s EISA Configuration utility . To disable termination on the host adapter, refer to Chapter 3, Configurin g the Ho st Adapt e r for instructions.

Terminating Other SCSI Periphera l Devic es

Most SCSI devices use a jumper or a switch located clo se to their SCSI connecto r(s) . On some SCSI devic es, you will hav e to phy sically remove resistor modu le(s). Refer to the manufactu r er’s doc u mentation for instructions on enabling or disablin g SCSI bus termination on your SCSI peripheral device(s).

Note

Some drives allow for the option of supplying termination power to their resis tor modules from the SCSI bus instead of from the drives power suppl y. This option is acceptable since the AHA-2740 Series of host adapters always supplies termination power on the SCSI bus.

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AHA-2740 Series User’s Manual

SCSI ID Setting

Each SCSI device located on the SCSI bus must be set to a unique SCSI ID (0-7). Th e SCSI ID serves two purposes: it uniquely defines eac h SC SI devic e’s addr es s, and it determin e s the device’s prio rity on the bus durin g arb itration phase. The arbitration phase determin es wh ic h device w ill own the bus when two or more devices simultaneou sly requ e st to use it. SCSI ID 7 has the highest priori ty, and SCSI ID 0 has the lowest. When selecting the SCSI ID, consider the following :

The default value for your host adapter is SCSI ID 7

•

You only need to change a device’s SCSI ID if it conflicts

•

with the SCSI ID of another dev ic e or anoth er host adapter (assuming they are on the same SCSI bus)

If you are installing more than one SCSI host adapter,

•

each host adapter may be set to the same SCSI ID (assuming they are on separ a te SCSI busses)

SCSI IDs 0 and 1 are best reserved for SC SI hard di sk

•

drive s SCSI ID 0 is best reserved for the SCSI hard disk drive

•

that will be used as you computer’s boot device SCSI ID 1 is best reserved for a second hard disk drive

•

SCSI ID 2 is often used for tape devices

•

Refer to Chapter 3, Configuring the Host Adapter for instructions on changing the SCSI ID for the host adapter.

The SCSI ID on most SCSI devices is typically set with jumpers or with sw itches on the SCSI device. Refer to the SCSI device documentation for info rmation on changin g the SCSI ID on othe r SCSI devices.

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Getting Start ed

Board Installation

To install the host adapter in your EISA system, the chassis cover must be removed and the mother board ex posed . Al ways refer to your EISA system documentation for ins tructio ns on removing the cha ssis cover and add ing option boards, su ch as th e AHA-2740 Series of host adapters.

WARNING

Turn OFF and disconnect power to the system and external equipment before removing t he chassis cover or attempting any motherboard modifications.

To install the AHA-2740 Series of host adapters in your EISA computer system:

1 Remove the cover of your EISA compu ter system to expose

➤

the EISA bus slots on the motherboard.

2 Locate an unused EISA slot in your system which supports

bus master operations (refer to the host computer system documentation for details) and remove the corresponding slot cover.

3 Carefully remove the host adapter from the antistatic bag.

Place the host adapter on top of the bag if you need to set it down.

4 Align and insert the host adapter in the EISA slot. Secure the

host adapter in your system.

Note

EISA boards require firmer seating than typical ISA expansion boards. Make sure the host adapter is fully seated in its slot.

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AHA-2740 Series User’s Manual

SCSI Bus Activity LED Connector

Most computer systems have a disk drive activity ligh t, usually an LED (Light Emitting Diode) on the front panel. If y ou conn ec t your system’s LED cable to the host adapter, the LED will light to indicate data transfer on the SCSI bus.

Note

If you conn ect you r comp uter’ s LED to the h ost adap ter , the LED will no longer indicate non-SCSI disk activity. So yo u may not want to use this featur e i f you are running non-SCSI disk drives.

To connect the SCSI bus LED connector: 1 Refer to your system’s docu men tation to locate and unplug

➤

the LED cable from the connector on the system board.

2 Connect the LED cable to the SCSI activity LED c onne ctor

(J1) on the host adapter as shown in Figure 2-5.

Note

On systems with a two position LED cab le, connect the LED cable to pins 1 and 2 of the LED connector .

LED CABLE

PIN 1

LED CONNECTOR

Figure 2-5. SCSI LE D Con nec tor

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Getting Start ed

Connecting Peripherals

Up to seven SCSI devices can be con nected to the internal and external conne ctor s on the AHA-2740/2742. Up to two floppy diskette drives can be connec ted to the floppy co nnec tor on the AHA 2742/2742T. Always refer to the manufactu re r’s doc ume ntation before connecting and installing y our SCSI device(s) and/or floppy diskette drive(s).

Note

Only Single-End ed SCSI devices are supported by the host adapter. Differential SCSI devices may be damaged if con- nected to the host adapter bus. Most SCSI devices currently produced are Single -Ended SCSI devices. Consult your SCSI device user documentation to verify that your SCSI device is a Single-Ended SCSI device.

SCSI Devices

SCSI devices are either internal SCSI devices or external SCSI devices. In ter nal SC SI devic es usu ally have only a single conn ec tor and can only be cable d to the inter nal c on nector on the host adapter. External SC SI devices usu ally have two connec tor s and can be cabled to either the exter nal con n ector on the hos t adapter or to the external conn ec tor of an othe r exter nal SC SI devic e.

SCSI devi c e s are cabled together in a s in gl e continuous dais y- ch a in of devices. This chain may have no b ran ches, but must r un from device to d evi ce in a continuous ser ies . I f your host adap ter i nclude s both internal and external SCSI devices, the host adapter will be at the junction between the internal and external devices.

The AHA-2740/2742 has a single-chan n el, SC SI Chan nel A, tha t can accommodate a SCSI bus with up to seven SCSI devices connected. The AHA-2740T/2742T uses Adaptec’s TwinChannel architecture an d has two chann els, SCSI Chann el A and SC SI Channel B, that can each accommodate a SCSI bus with up to seven SCSI devices connected.

SCSI Channe l A is comprised of both an inter nal an d exter n al connector , while SCSI Chan nel B is comprised of only an inter n al

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AHA-2740 Series User’s Manual

connector. To connect SCSI devices to SCSI channel A, you will need either an intern al SCSI cable and/o r exter nal SC SI cable. To connect SCSI devices to SCSI Chan nel B, you will need only an internal SCSI cable.

Connecting Internal SCSI Devices

The internal connec tor for your host adapter uses a 50-pin SCSI ribbon cable with a 50-pin header intern al conn ector.

When connecting the 50-pin internal SCSI ribbon cable to both the host adapter and to the internal SCSI device(s), make sure that Pin 1 orientation is maintained throughout the bus. Pin 1 of the SCSI cable is designated by a colored stripe on one edge of the ribbon cable. Pin 1 of the host adapter or S CSI device c onnector is u sually designated by a delta or arrow symbol (▲) on the c onnector.

Note

Refer to the manufacturer’s instructio ns to install and mount internal SCSI devices inside your computer chassis.

To connect internal SCSI devic es: 1 Connect one end of the 50-pin SCSI ribbon c able to the internal

➤

connector on the host adapter, as shown in Figure 2-6.

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COLORED

STRIPE

SCSI RIBBON

CABLE

PIN 1

INTERNAL

SCSI CONNECTOR

Figure 2-6. C onne ctin g C able to Inte rnal Connector

Getting Start ed

2 Connect the other end of the 50-pin SCSI ribbon cable to the

connector on the internal SCSI device, as shown in Figure 2-7.

PIN 1

COLORED STRIPE

INTERNAL

SCSI DEVICE

Figure 2-7. C onne ctin g Cab le to SC SI Devi ce

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3 To connect a second internal SCSI devic e, plug the middle

connector of the SC SI ribbon cable to the connector on the second internal SCSI device, as shown in Figure 2-8.

PIN 1

COLORED STRIPE

INTERNAL

SCSI DEVICE

TO 1ST INTERNAL

SCSI DRIVE

Figure 2-8. Co nne cting a Secon d Inte rna l SCSI Device

TO HOST

ADAPTER

4 To connect three or more internal S C SI devices to a SCSI bus,

obtain a 50-pin SCSI ribbon cable with enough connectors to accommodate all of your internal S CSI devices.

Connecting External SCSI Devi ces

The external connector for SCSI Chan nel A uses a 50-pin shielded cable with a high-de nsity external con n ector. Extern al cable connector s ar e keyed an d can only be plugg ed- in one way ; Pin 1 orientation is automatic.

To connect external SCSI devices: 1 Connect one end of the external cable to the host adapter

➤

external connector, as shown in Figure 2-9.

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Getting Start ed

EXTERNAL

CONNECTOR

SCSI CABLE

Figure 2-9. Co nne cting Exte rna l Cab le to H ost Ada pter

2 Connect the other end of the external cab le to either on e of the

SCSI connectors on the SCSI device, as shown in Figure 2-10.

EXTERNAL SCSI

DEVICE

EXTERNAL SCSI

CABLE

Figure 2-10 . Con nec ting E xternal C ab le to SC SI Dev ice

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3 To connect subsequent external SCSI devices, obtain addi-

tional external cables and c hain eac h devic e to the previo us device until all external S CSI devices hav e been co nnected, as shown in Figure 2-11.

EXTERNAL SCSI

DEVICES

EXTERNAL SCSI

CABLES

Figure 2-11. Connec ting M u ltip le Extern al SCSI Devic es

Floppy Diskette Drives

Floppy diskette drives connected to the floppy connector on the host adapter are not part of the SCSI bus; floppy diskette drives are controlled by the non-SCSI floppy diskette controller on the host adapter.

Connecting Floppy Diskette Drives (AHA-2742/2742T Only)

The floppy connector on the AHA-2742/2742T uses a 34-pin floppy ribbon cable with a 34-pin header connec tor . Make sure to maintain Pin 1 orientation a s described in prev iou s section

Connectin g Inte rn al SCSI D evic es.

Note

If you are not using the flo ppy contr oller on the AHA-2742/2742T, be sure to disable it by removing the jumper shunt on Jumper J4.

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To connect floppy diskette drives: 1 Connect one end of the 34-pin floppy ribbo n cable to the

➤

floppy connector on the host adapter, as shown in Figure 2-12.

COLORED

STRIPE

Getting Start ed

FLOPPY RIBBON

CABLE

PIN 1

FLOPPY

CONNECTOR

Figure 2-12. Connectin g Floppy C able to Hos t Adapte r

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2 Connect the other end of the 34-pin floppy ribbon cable to the

connector on the first floppy drive (Drive A), as s hown in Figure 2-13.

PIN 1

FLOPPY

DISKETTE DRIVE

Figure 2-13. Connectin g Floppy C able to F loppy Drive

COLORED STRIPE

3 To connect a second floppy drive, plug the middle connec tor of

the floppy ribbon cable to the connector on the second flop py drive (Drive B), as shown in Figure 2-14.

PIN 1

COLORED STRIPE

TO HOST

FLOPPY DISKETTE

DRIVE

TO 1ST FLOPPY

DRIVE

ADAPTER

Figure 2-14. Connectin g a Seco nd Floppy Drive

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Getting Start ed

Before Re-booting Your System

Before re-booting your system an d c onfiguring your host adapte r, make sure you have completed the following:

1 The SCSI bus is properly terminated.

➤

2 Each SCSI device on the SCSI bus is set to a unique SCSI ID

between 0 and 7.

3 The host adapter is firmly seated in the host computer ’s EISA

slot.

4 Internal SCSI devic es are connec ted to the host adapter with

the 50-pin SCSI ribbon cable and that proper Pin 1 orientation is maintained.

5 External SCSI devices are properly installed and cabled. 6 If u s in g t h e o n- b o a r d f l op p y c o n t r ol l er o n t h e AHA-2742/2742T,

the floppy diskette drive is conn ected to the host adapter with the 34-pin SCSI ribbon cable and that proper Pin 1 orientation is maintained.

7 All system and power cables are properly connected .

Reassemble the System

Refer to your system and SCSI device documentation to replace the system cover and connect all system and SCSI device power cables.

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Configuring the Host Adapter

About This Chapter

Read this chapter to find out:

The step s involved in conf iguring your ho st a d ap t er with the

•

EISA Configuration utility provided with your EISA system The host adapter parameters that can be configured

•

The options available to configure the host adapter BIOS

•

and the devices connected to the host adapter The two utilities available in the EISA Configuration utility

•

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The EISA Configuration Utility

All EISA machines are shipped with a bootable E ISA Configur ation diskette that contains a software prog ram gen erally known as the EISA Configuration utility. This utility is used to automate the configuration of the motherboard and all option boards installed in your EISA system.

The EISA Configuration utility must be run every time an adapter card is physically added , removed, or moved. The utility operates on the information provided by the files and . board and/or adapter card.

Always refer to the documentation provided with your EISA system for instructions on adding and configuring adapter boards.

Depending on the EISA Config uration utility supplied w ith your system, host adapter configuration will vary; however, the basic steps include:

ovl

(overlay) files that accompany the EISA system

Note

.cfg

(configuration)

Run the EISA Configuration utility

•

Copy the configuration and over lay files

•

Select the host ad apter

•

Configure the host adapter parameters

•

Configure BIOS and SCSI device

•

Exit the EISA Configuration utility

•

Note

The screens displayed in this chapter may vary from the screens displayed by the EISA Configura tion utility su pplied with yo ur system.

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Run the EISA Configuration Utility

Run the EISA Configuration utility as instructed by the EISA system vendor.

Place the bootable EISA configuration diskette in an operative drive and reset the system to boot from this diskette. If you have the Configuration utility installed on your hard disk, reboot your system and run the utility from your hard disk.

After booting with the host adapter installed, ignor e any error that indicates that an unknown board has been detected in the system.

Copy Configuration and Overlay Files

The

!adp7771.cfg

needed to configur e your ho st adapter with your EISA system are located on the diskette that came with your host adapter.

The EISA Configuration utility typic ally allows you to select among a number of options, includin g copyin g new configu ra tion files. Select this option to copy the

adp7770.ovl

bootable EISA configuration diskette or to the directory on your hard disk where the EISA Configura tion utility is located.

configuration file an d

adp7770.ovl

!adp7771.cfg

overlay file

and the

files from the host adapter diskette to either the

If the Configur a tion utility does not prov ide suc h an option , use the DOS Copy command to copy these files.

Select the Host Adapter

Once the configuration and overlay files have been copied, choose the option i n the E ISA C onf i g ur at i on utility that allows yo u t o configure t he EISA slot in whic h t he host adapter is in st a lle d. If necessary, scroll down the screen until you find a screen tha t lists the host adapter and its parameters and looks similar to Figure 3-1.

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Configuring the Host Adapte r

Slot 1 - Adaptec AHA-2470/AHA-2740T SCSI Host Adapter

Host Adapter Interface Definitions

Interrupt Level .........................................

Bus Release Time ...................................

Data FIFO Threshold ...............................

BIOS Definitions

Host Adapter BIOS Base Address ..........

SCSI Channel A Configuration

Host Adapter SCSI ID ...............................

SCSI Bus Parity Check ............................

SCSI Selection Timeout ...........................

SCSI Bus Reset at Power-on ...................

SCSI Bus Termination .............................

BIOS and Device configuration ...................

Utilities ........................................................

Edit=Enter <Edit Resources=F6> <Advanced=F7> <Done=F10>

IRQ 11 60 BCLKS 100%

D8000H

7 Enabled 256 milliseconds Enabled Enabled Press <Enter> to configure Press <Enter> to access

More: PgUp/PgDn

Figure 3-1. Host Adapter Para m eters

Note

If your host adapter is an AHA-2740T/2742T, a set of parameters for SCSI Channel B is displayed and can be configured.

Configure the Host Adapter Parameters

Use the cursor keys and/or fun ction keys as instructed on the screen’s menu to move between each parameter, or to select and configure each parameter.

Interrupt Level

Select Interrup t Level to configure the interrupt channel (IRQ) used by the host adapter. Figu r e 3-2 display s you r choic es. Th e default setting is IRQ 11.

Multiple AHA-2740 Series host adapters installed in your system can share the same IRQ; however, to increase system per formance, you may want to select a different IRQ for each host adapter installed.

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Note

The IRQ cannot be shared with ISA mode SCSI host adapters such as the Adaptec AHA-1540 and AHA-1520 Series adapters. If those adapters are installed in your EISA system, they must be assigned unique IRQs.

Host Adapter Interface Definitions

Interrupt Level

( ) IRQ 11 ( ) IRQ 9 ( ) IRQ 10 ( ) IRQ 12 ( ) IRQ 14 ( ) IRQ 15

Done=F10 <Edit Resources=F6> <Cancel=ESC>

Figure 3-2. Selecting Interrupt Lev el

Bus Release Time

Select Bus Release Time to configur e the amoun t of time, in BCLKS (Bus Clocks), the host adapter will continu e to tran sfer data after being pr e-emp te d in bus m a ster mode. Figu r e 3-3 displays your choices. The default setting is 60 BCLKS.

Normally 60 BCLKS is optimum; however, if multiple bus master cards are installed in the system, you may want to lower the value to free the EISA bus sooner.

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Configuring the Host Adapte r

Host Adapter Interface Definitions

Bus Release Time

( ) 60 BCLKS ( ) 44 BCLKS ( ) 28 BCLKS ( ) 12 BCLKS ( ) 2 BCLKS

Done=F10 <Edit Resources=F6> <Cancel=ESC>

Figure 3-3. Selecti ng Bus R elea se Tim e

Data FIFO Threshold

Select Data FIFO Thr esh old to configure the percentage used by the host adapter. Figure 3-4 displays your choices. The default setting is 100%.

Normally a Data FIFO Threshold of 100% is optimum.

Host Adapter Interface Definitions

Data FIFO Threshold

( ) 100% ( ) 75% ( ) 50% ( ) 0%

Done=F10 <Edit Resources=F6> <Cancel=ESC>

Figure 3-4. Selecting Data FIFO Thr esho ld

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Host Adapter BIOS Base Add ress

Select Host Adapt er B IO S Base Addr ess to configure the BIOS base address for the host adapter, or to disable the host adapter BIOS. Figure 3-5 displays your choic es. The default setting is a base address of D8000h.

When choosing the base address, ver ify that there is no conflict with other devices using the same address–often the C onfiguration utility will notify you if there is a conflic t.

Note

The BIOS must be enabled in order to boot from a SCSI fixed disk drive attached to the host adapter.

Host Adapter BIOS Base Address

Done=F10 <Edit Resources=F6> <Cancel=ESC>

BIOS Definitions

( ) D8000H ( ) CC000H ( ) D0000H ( ) D4000H ( ) DC000H ( ) E0000H ( ) E4000H ( ) E8000H ( ) BIOS disabled

Figure 3-5. Selecting Ho st Adapte r BI OS B as e Addres s

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Configuring the Host Adapte r

Host Adapte r SCSI ID

Select Host Adapt er SC SI ID to configure the SCSI ID (0-7) setting for the host adapter. Figure 3-6 displays your choices. The default setting is 7.

Each installed SCSI device must have a unique SCSI ID. SCSI ID 7 is normally assigned to the host adapter; SCSI IDs 0 and 1 should be reserve d for SCSI hard disk dr ive s.

If two host adapters are installed, each would have its own SCSI bus, thus each host adapter would still be set to SCSI ID 7. Refer to Chapter 2, Getting Started for additional information on SCSI ID.

SCSI Channel A Configuration

Host Adapter SCSI ID

( ) 7 ( ) 6 ( ) 5 ( ) 4 ( ) 3 ( ) 2 ( ) 1 ( ) 0

Done=F10 <Edit Resources=F6> <Cancel=ESC>

Figure 3-6. Selecting Host Adapte r SCSI ID

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SCSI Bus Parity Check

Select SCSI Bu s Pa rity Check to enable or disable SCSI bus parity checkin g on the host adapter. Fig ure 3-7 displays your choices. The default setting is enabled.

The host adapter always generates parity when writing to the SCSI bus. If any attached SCSI devices do not support SCSI parity checkin g, then SCSI Bus Par ity Check should be disabled. Most devices today , however, do support SCSI parity checking.

SCSI Channel A Configuration

SCSI Bus Parity Check

( ) Enabled ( ) Disabled

Done=F10 <Edit Resources=F6> <Cancel=ESC>

Figure 3-7. Selec ting SC SI Bus Par ity

SCSI Selec tion Timeout

Select SCSI Selection Timeout to configure the time, in milliseconds, used by the host adapter during the SCSI selection phase. Figure 3-8 displays your choices. The default setting is 256 milliseconds.

Lowering the SCSI Selection Timeout will speed up SCSI bus scans considerably ; how ever , before lower in g this value, make sure that all the devices on the SCSI bus can respond to the shorter selection time.

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Configuring the Host Adapte r

SCSI Channel A Configuration

SCSI Selection Timeout

( ) 256 milliseconds ( ) 128 milliseconds ( ) 64 milliseconds ( ) 32 milliseconds

Done=F10 <Edit Resources=F6> <Cancel=ESC>

Figure 3-8. Selecting SCSI Selec tion Tim eout

SCSI Bus Reset at Power-on

Select SCSI Bus Reset at Power -on to enable or disable a SCSI bus reset generated by the host adapter during its power-on initialization, and after a hard reset. Figure 3-9 displays your choices. The default setting is enabled.

Normally, SCSI Bus Reset at Power-on should always be enable d.

SCSI Channel A Configuration

SCSI Bus Reset at Power-on

( ) Enabled ( ) Disabled

Done=F10 <Edit Resources=F6> <Cancel=ESC>

Figure 3-9. Selecting SCSI Bus R eset at Powe r-on

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SCSI Bus Termination

Select SCSI Bus Termination to enable or disable SCSI termin ation on the host adapter. Figure 3-10 displays your choices. The default settin g i s enabled.

Host adapter termination should be disabled only if you attach SCSI devices to both intern al and ex ternal co nnec tor s, sinc e the host adapter would then be in the middle of the SCSI bus. Refer to Chapter 2, Getting Started for informa tion on termina tion.

SCSI Channel A Configuration

SCSI Bus Termination

( ) Enabled ( ) Disabled

Done=F10 <Edit Resources=F6> <Cancel=ESC>

Figure 3-10. Confi gur ing SC SI Bus Ter m inati on

BIOS and Device Configuration

Select BIOS and Device Configuration to configure the BIOS and SCSI device options. Figure 3-11 displays your choic es.

BIOS and Device Configuration

( ) BIOS configuration ( ) Device configuration

<ESC>

Figure 3-11. BIOS and Devic e Conf igu rati on

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Configuring the Host Adapte r

BIOS Configuration

BIOS Configuration allows you to configure the host adapter BIOS. Figure 3-12 displays you r choice s. Use the cursor keys to move between options. To toggle values for each option, press the Enter key.

BIOS Configuration

This configuration will affect BIOS only.

( ) Support Removable Disks as Fixed Disk .......Boot Device Only

( ) Extended Translation for Drives > 1 GByte ............... Enabled

( ) Support More than two drives .................................... Disabled

<ESC>

Figure 3-12. BIOS C onfigu rati on Sele ction

Support Removable Disks as Fixed Disk

This option allows you to configur e remov able media drive s supported by the BIOS. The default se tting is Boot Device Only. The following choices are a vailable:

Boot Device Only – Only the removable media drive designated as the boot device will be tr eated as a f ixed disk.

All Devices – All removable media driv es suppor ted by the BIOS will be treated as fixed disk drives.

Disabled – No removable dr ives will be treated a s fixed disks. Software drivers are needed for drives not controlled by the BIOS.

Note

Support for removable drives means only that the BIOS allows for use of a remov able drive as if it we re a f ixe d di sk driv e; it does not mean that the disk media can be removed du r ing oper ation .

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Extended Translat ion for Drives > 1 GByte

This option allows you to enable or disable extended translation for SCSI hard disk s wi th a capac ity g re a ter than 1 G By te. Th e default setting is enabled. Append ix D, Disk Drives Over 1 Gigabyte discusses the extended translation feature in detail.

If this option is enabled, the following translation schemes are used:

SCSI har d d i sks ≤ 1 G Byte use a translation scheme of 64

•

heads, 32 sectors per track SCSI hard disks > 1 GByte use a translation scheme of 255

•

heads, 63 sectors per track

Note

Enabling this option for operating systems that do not need extended translation (e.g., NetWare

386 and UNIX®) can

cause drive failure and/or data loss)

Support More than Two Drives

This option allows you to enable or disable BIOS support for more than two SCSI hard disks (supported by DOS 5.0 and above). The default setting is disabled.

SCSI Device Configuration

SCSI Device Configuration allows you to customize the configuration of each SCSI device connected on the SCSI bus. When this option is selected, a screen similar to Figur e 3-13 is di splaye d. All SCSI IDs are displayed on the screen even if no SCSI device is attached; however , to configu re a specific SCSI device, you will need to know which SCSI ID corr espon ds to tha t SCSI device.

Use the cursor keys to move between option s. To toggle v alue s for each option, press the Enter key.

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Channel A Device ID

Configuring the Host Adapte r

Configuration Setting for SCSI Devices (1x8)

Enable Disconnection Initiate Sync Negotiation Maximum Sync Xfer Rate Include in BIOS Scan Error if Device Not Found Send Start Unit Command

OK <ESC> <DEFAULT>

yes yes

10.0 yes no no

yes yes

10.0 yes no no

yes yes

10.0 yes no no

yes yes

10.0 yes no no

yes yes

10.0 yes no no

yes yes

10.0 yes no no

yes yes

10.0 yes no no

yes yes

10.0 yes no no

Figure 3-13. SCSI Devic e Conf igu rati on

Enable Disconnection

This option is used to determine whether or not the host adapter will allow a SCSI device to disconnect from the SCSI bus (sometimes referred to as disconnect/reconnect). This allows the host adapter to perform other oper ation s on the SCSI bu s while the SCSI device is temporarily disconnected.

When set to yes, the SCSI device may disconnect from the SCSI bus. The SCSI device, howe ver, may choose not to disconnect, even if allowed to by the host adapter (this is usually configurable on the SCSI device). When set to no, the SCSI device will not be allowed to disconnect from the SCSI bus. The default setting is yes.

In general, disconn ec t should be allowed for the most efficien t SCSI bus utilization and highest overall system performance. If only one SCSI device is attached to the SCSI host adapter, disconnects are not required for efficien t SCSI bus utilization sinc e only one SCSI device is using the SCSI bus. A slight performance increase may be realized if disconnec t is not allowed in this case, due to the decreased SCSI overhead. In multi-de vice env ironments, disconnect shou ld normally be enabled to take advantag e of the disconnect/r econ nect featu re.

If a particular SC SI device doe s not suppor t discon nec t/r ec on nec t, then Enable Disconne ction should be disabled (set to no). If a particular SCSI devic e does suppo rt disco nnec t/r econ n ect, then Enable Disconne ction should be en abled (set to yes) . Most SCSI devices today do suppor t disconn ec t/rec onne ct.

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Initiate Sync Negotiat io n

This option determines wh eth er or not the host adapter will initiate synchro nous ne gotiation with the SCSI device.

When set to yes, the host adapter will initiate synchronous negotiation with the SCSI device. When set to no, the host adapter will not initiate synchronous negotiation with the SCSI device. The host adapter, however, will alw ay s respond to synchron ou s negotiation initiated from the SCSI device. The default setting is yes.

If neither the host adapter nor the SCSI peripheral negotiate for synchronous data transfers, all data transfers will be asynchronous.

Note

Some older SCSI-1 devices may have trouble handling synchronous negotiation, which may result in erratic behavior or a hang condition. For these device s, set Initiate Sync Negotiation to no.

Maximum Synch Xf er Rate

This option determines the maximum synchronous transfer rate (MBytes/sec), that the host adapter will support. The host adapter supports rates up to the Fast SCSI maximum of 10 MBy tes/second. The default value is 10.0 MBytes/sec . Valid values are:

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10.0 MBytes/sec

•

8.0 MBytes/sec

•

6.67 MBytes/sec

•

5.7 MBytes/sec

•

5.0 MBytes/sec

•

4.4 MBytes/sec

•

4.0 MBytes/sec

•

3.6 MBytes/sec

•

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Configuring the Host Adapte r

The Fast SCSI synchronous data transfer rates are 10.0, 8.0, 6.67, and 5.7 MBytes/sec. If the host adapter is set not to negotiate for synchronous data transfer (i.e., Initiate Sync Negotiation is set to no), then the value selected here will be the maximu m rate that the host adapter will accept.

In most cases, the maximum value of 10.0 MBytes/sec can be used. If the drive is not a Fast SCSI drive and cannot support the fast data transfer rates, it can negotiate for a slower rate (this is standard SC SI protocol) . Howev er , if a drive cann ot acc ep t value s greater than 5.0 MBytes/sec (the highe st standard syn chr onou s transfer rate), then the Fast data transfer rates should not be used for the device. Older SCSI-1 devices may not accep t the Fast data transfer rates, which may result in erratic behavior or a hang condition.

Include in BIOS Scan

This option determines whether or not the host adapter BIOS supports devices attached to the SCSI bus without the need for device driver s of tw a re.

When set to yes, the host adapter BIOS control s the SCSI device. When set to no, the host adapter BIOS will not search the SCSI ID for devices to contro l; dev ic e driv er so ftwar e is need ed to con trol the SCSI device. The default setting is yes.

Caution

If a removable media SCSI device is controlled by the host adapter BI OS, do not remove the media while the system is powered-on or d ata loss could occur! The host adapter BIOS does not support removability w hile the system is turned on . I f removabilit y is desired while the system is powered-on, the removable media de vice s hould be ins talled with device drivers and not the host adapter BIOS.

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AHA-2740 Series User’s Manual

Error if Device Not Found

This option determines wh ether or not the host adapter BIOS generates an error message when the BIOS is unable to find the device du rin g boot-u p.

When set to yes, the BIOS checks the SCSI ID for a SCSI device; if none is found, an error message is displayed du ring boot-up similar to the following:

Channel A, Target #1 – Devi ce Not Found

When set to no, the BIOS does not attempt to display en error message if the SCSI device is not found. The default setting is no.

Send Start Unit Command

This option, which is suppor ted by some SCSI devic es, determines whether or not the SCSI Start Unit Command (SCSI command 1B) is sent to the SCSI device (most devices do not require this). The Start Unit Command reduces the load on your computer’s power supply by allowing the host adapter to power-up SCSI devices one-at-a-time when you boot your system. Otherw ise, the devices will all power-up at the same time.

When set to yes, the SCSI Start Unit Command is sent to the SCSI device dur ing boot-up. When set to no, the SCSI device will power-up in its normal fashion. The default settin g is no.

If this option is selected for more than one SCSI device, the SCSI device with the lowes t SCSI ID will be sent the SCSI Start Unit Command first. When the firs t device is ready and respon ds to the host adapter, the next highest SCSI ID with a setting of yes is sent the SCSI Start Unit Command. This proce ss continues until all supported devices respon d to the host adapter.

Note

If many drives are set to yes for the SCSI Start Unit Command, system boot time will vary depending on how long each drive takes to spin-up.

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Configuring the Host Adapte r

Exit SCSI Device Configuration

When configu ra tion of SCSI devices i s complete, press Esc to exit SCSI device configuration ; you will be prompted to either save or abandon device configu ration s, as shown in Figure 3-14.

Save/Abandon device configuration

( ) Save device configurations ( ) Abandon device configurations

<ESC>

Figure 3-14. Exiting SC SI D evi ce Con fig ura tion

Exit the EISA Configuration Utility

Once the host adapter and SCSI devices are proper ly config ur ed, save and exit the EISA Configuration utility as instructe d on the screen’s menu. The following section, Utilities, descr ibes the two utilities available in the EISA Configuration utility.

Utilities

Select Utilities from the EISA Configuration utility to access the two SCSI utilities that are available with your host adapter, a s shown in Figure 3-15.

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AIC-7770 Utility Selection Options

( ) Disk Format Utility ( ) Host Adapter Diagnostic Utility

<ESC>

Figure 3-15. Utility Selection

Disk Format Utility

This utility allows you to low-lev el for mat you r SCSI disk and/ or verify disk media for defects.

Note

When migr ating hard disk drives and/or rem o va ble media driv e s from ot her manufacturer s host adapters, the disk format utility should be run to low-level format your drive.

Disk Format

Your fixed disk media must be low-level formatted befor e you can use your opera ting sys tem’s par titionin g and file per par ation commands, such as MS-DOS

fdisk

and

format

Most SCSI disk devices are pre-formatted, and do not need re-formatting. The Adaptec low-lev el for matting utility is compatible with the vast majority of today’s SCSI disk drives.

Caution

All dat a o n the drive wi ll be l ost when p erforming a l ow-level format. Be su re to bac k up your d ata b efo re p erf ormi ng th is op erat ion.

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Disk Verify

Configuring the Host Adapte r

Once your SCSI disk is low-level for ma tted,

disk verify

scans the disk’s media for defec ts. If bad block s are fou nd, you ar e prompted to reassign them.

Host Adapter Diagnostic Utility

This utility runs a diagnostic on your host adapter by doing DMA transfers between the SCSI host adapter and system memory. This test will run indefinitely until Esc is pressed.

❒

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Troubleshooting

About This Chapter

Read this chapter to find out:

How to use the troubleshooting checklist to diagn ose pro b-

•

lems that may occur when you install a host adapter in your sys tem

Problems you may encounter and how to fix them

•

How to resolve conflic ts with other options

•

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SCSI Troubleshooting Checklist

The AHA-2740 Series has been extensively tested for compatibility with popular SCSI periph er al dev ice s acro ss variou s oper ating systems. Most problems that might occur during installation can be traced to errors in prepar in g devic es on the SCSI bus.

The following suggestions should help you to solve any problems that you may encounter. If you need additional help in getting the host adapter running pr oper ly , in formation on contac ting Adaptec Technical Supp ort is included in Chapter 1, Introduction.

If a problem occurs during installation, check these items first: 1 Be sure all SCSI peripheral devices are connec ted to power.

➤

Connect internal periph er als to your compute r’s power supply; plug extern al perip heral pow er cable s into a grounded line power outlet. Follow the instru ctions in the hardw are documen ta tion.

2 Be sure all cables are properly connected. Check both power

and SCSI interface cables. See Inst alla tio n in Chapter 2.

3 Be sure the SCSI devices and host adapter on each SCSI bus

are each set to differen t SCSI ID s. See SC S I I D Se tt in g in Chapter 2.

4 Check SCSI bus termination. The ends of the bus must be

terminated. See Termina tion on the SCSI Bus in Chapter 2.

5 If you have installed more than one SCSI host adapter make

sure that each host adapter is set to a separate BIOS address, or disable the BIOS on all but one of the host adapters. See Configure the Host Adapter Parameters in Chapter 3.

If your problem is still not resolved, contin ue with the next section.

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Problems and Solutions

The screen i s di ffic ul t to read when I run the EI SA Confi g u rat ion utility .

Try pressing F5 to toggle the display between color and monochrome modes. Thi s may enab le you to read the scr e en more easily.

I installed the hos t adapte r, and my com pu ter w ill not boot from th e SCSI disk drive.

If both SCSI and non-SCSI disk drives are installed, then the nonSCSI disk drive is always the boo t devic e. If your system ha s only SCSI disk drives:

1 Make sure your compu ter system’ s CMOS

➤

setup

is set to No

Drives Installed, as is required for SCSI host adapters.

2 Try setting the SC SI boo t drive to SCSI ID 0. Th i s is nor -

mally done by changing jumper s or switch es on the drive. On each SCSI bus, SCSI devices must be set to a unique SCSI ID, which ran ge fro m 0 to 7. See SCSI ID Setting in Chapter

3 Try enabling Include in BIOS Scan in the BI OS and SCSI

Device Configuration option. See Configure BIOS and

SCSI Device in Chapter 3.

4 Make sure the SCSI bus is properly termin ated. See

Terminat ion on the SCSI Bus in Chapter 2.

5 You may need to low-level for mat the SCSI hard drive. If so,

first back up all data on the disk, then run the

format

accessible through the EISA Config uration utility . See Utilitie s in Chapter 3.

Similar formatting utilities for removable media devic es are included in the Adaptec EZ-SCSI software package for the DOS/Windows environment. Refer to Appendix B, I/O Operating Environm ent. These utilities are also available from the Adaptec BBS.

utility

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Troubleshooting

When I tried to use the Unexpected SCSI Comma nd Fai lur e pop-up b o x with a lot of error information. Wha t does this mean?

This probably means that the utility encountered a problem with the disk device or the media and ther efor e cannot run. Th e following information appears in the pop-up win dow :

SCSI target ID of the device

•

SCSI CDB Sent (e.g., 2F 00 00 00 00 00 00 08 00 00)

•

Host Adapter Status (e.g., 11h - Selection timeout)

•

Target Status (e.g., 00h - Good status)

•

Sense Key (e.g., 06h - Unit attention)

•

Additional Sense Code

•

Additional Sense Code Qualifier

•

You can probably determin e from the Sense Ke y information both the cause of the problem and its solution. Here are some of the more common Sense Key values and their meanings:

format/verify

utilit y on a disk device, I go t an

02h - Not ready

The media is not ready to format. Be sure that media is inserted in the drive and that the media is spun-up .

03h - Medium error

The disk media may be defective. If it is a removable media drive, try using a different media. If it is a fixed disk drive, the disk may be physically damaged.

04h - Hardware error

The disk drive may be defective . Con sult the hardw ar e documentation and contact the manufacturer.

05h - Illegal request

The Adaptec formatting utility does not support a low-level format of this device. The device may already be low-level formatted by the manufacturer . (This error rarely occur s.)

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06h - Data protect

The removable media may be write-pr otec ted. Remov e write protection and run the utility again.

The Additional Sense Code field provides more inf orm ation about the error. The meaning of these codes may be li sted in your hardware man ual.

My computer locks up wh e n I press Esc to exit the EISA Confi guratio n utility .

If this happens, tur n your mach ine off and then on to reboot. Any settings you changed before you tried to exit the program have been registered in th e EEPROM and will not be lo st.

One of the SCSI devic es on m y system does not allow term i nat ion to be disabled. How can I attach it to the SCSI bus ?

You might be able to attach this device on the end of the SCSI bus so you do not need to disable termina tion on it. If thi s is not possible, contact the manufacturer about possible work-aro unds.

I installed my host adapter board at IRQ12, and it does not work properly. What is wron g?

Another devic e such as a mouse may be using IRQ12. Ch ang e the adapter board’s IRQ to the default value (11) or to some oth er value. See Configure the Host Adapter Parameters in Chapter 3.

When I insta ll m y host adapter it either does not get autom at i cal l y added by my EI S A Co nfig u rat i on ut ili ty , or an error is repo rted by t h e motherboar d as not being a va lid board , even after runni ng the EISA Configuration utility.

Verify that you are using the correct

.cfg

file and

.ovl

file for the host adapter. Also, other EISA boards and their position on the bus could be causing the board to be mis-iden tified.

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Troubleshooting

Conflicts With Other Options

You will encounter problem s if your host adapter and peripher al devices use overlappin g exten ded BIOS and I/O addresses. To correct this problem:

1 Change the IRQ settings with the EISA Configuration utility.

➤

2 Use the EISA Configuration utility to view BIOS addre sses

for the host adapter and, if necessary, change them.

❒

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Specifications

About This Appendix

Read this appendix to find out:

Technical specific ation s of the AHA-2740 Series host

•

adapter, EISA interface, SCSI interface, and floppy disk interfac e

Pin assignments for the inter nal and ex ternal SCSI

•

connectors

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Technical Inform ation

The basic technical specifications of the host adapter are described below. If you need more detailed information, contact Adaptec’s Literature Department at the address or phone numbers listed in Chapter 1, Introduction.

Product Specif icatio ns

Physical Dimensions

Length: 7.0 inches Width: 0.625 inches Height: 5.0 inches

Standard EISA-compatible form fac tor

Power Requirement s

+5.0 +/- 0.25 Volts at 2.0 Amps maximum

Environmental Requirements

Temperature: 0-55

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C (operating or storage)

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Extended Industry-Standard Architecture Interface

Table A-1. Standard EI SA Bus E lectr onic and Phy sica l Inter fa ce

Driver Output Signals

Receiver Input Sign als

0 volts minimum 0.4 volts maxim um 24 mA

2.4 volts minimu m 5.25 volts maxim um 8 mA

0.8 volts maximum

2.0 volts minimu m

SCSI Interface

Electrical Interface

These are the specifications listed in ANSI X3.131-1986 for single-ended oper ation .

Output Signals

All signals use open collector or three-s tate driver s. Each sign al driven by a SCSI device has the following output char ac teristic s when measured at the SCSI device’s connector :

Table A-2. Output Signals

Signal Definition Characteristics

Low-level out put voltage 0.0 to 0.5 volts DC at 48 mA

sinking (signal assertion)

High-level output voltage 2.5 to 5.25 volts DC (signal

negation)

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Specifications

Input Signals

SCSI inputs meet the following elec trical ch ar acter istics on each signal, inc lud ing both r ec eiv er s an d p a ssive dr ivers:

Table A-3. Input Signals

Signal Definition Characteristics

Low-level input voltage 0.0 to 0.8 volts DC (signal true) High-level input volt age 2.0 to 5.25 volts DC (sign al fa ls e) Low-level input cur re nt -0.4 to 0.0 mA at V1=0.5 volts DC High-level input cur re nt 0.0 to 0.1 mA at V1=2.7 volts DC

Minimum in put hyster esis = 0.2 volts DC. Maximum inp ut capaci tan ce = 25 pF (measured at the device conne ct or closest to the stub, if any, within the devic e).

Internal SCSI Connector

The internal SCSI connector must be an unshrouded 50-pin header, compatible with unshielded Altern ative 1 connec tor , as specified in ANSI X3.131-1986. Table A-4 lists the pin assignment s f or the in te rn a l co nn ec t or .

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Table A-4 . Inte rna l Con nec tor P in As sign m ents

Pin Si gnal N ame Pin Sig nal Nam e

1 Ground 2 -DB(0) 3 Ground 4 -DB(1) 5 Ground 6 -DB(2) 7 Ground 8 -DB(3) 9 Ground 10 -DB(4) 11 G r o un d 12 -D B(5) 13 G r o un d 14 -D B(6) 15 G r o un d 16 -D B(7) 17 Gr oun d 18 -DB(P) 19 Gr oun d 20 Ground 21 Gr oun d 22 Ground 23 Gr oun d 24 Ground 25 Open 26 Term Power (Fused) 27 Ground 28 Ground 29 Ground 30 Ground 31 Ground 32 -ATN 33 Ground 34 Ground 35 Ground 36 -BSY 37 Ground 38 -ACK 39 Ground 40 -RST 41 Ground 42 -MSG 43 Ground 44 -SEL 45 Ground 46 -C/D 47 Ground 48 -REQ 49 Ground 50 -I/O

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Specifications

External SCSI Connect or

The external SCSI connector must be a shielded 50-pin high density (Alternative 1) connector, as specified in proposed ANSI standard X3T9.2/86-109 Rev i sion 10h, Section 4, Figure 5. Table A-5 lists the pin assignments for the external con nec tor.

Table A-5. Exter nal Conne ctor Pin Assi gnm ents

Pin Si gnal N ame Pin Sig nal Nam e

1 Ground 26 -DB(0) 2 Ground 27 -DB(1) 3 Ground 28 -DB(2) 4 Ground 29 -DB(3) 5 Ground 30 -DB(4) 6 Ground 31 -DB(5) 7 Ground 32 -DB(6) 8 Ground 33 -DB(7) 9 Ground 34 -DB(P) 10 Ground 35 Ground 11 Ground 36 Ground 12 Ground 37 Reserved 13 Open 38 Term Power (Fused) 14 Ground 39 Reserved 15 Ground 40 Ground 16 Ground 41 -ATN 17 Ground 42 Ground 18 Ground 43 -BSY 19 Ground 44 -ACK 20 Ground 45 -RST 21 Ground 46 -MSG 22 Ground 47 -SEL 23 Ground 48 -C/D 24 Ground 49 -REQ 25 Ground 50 -I/O

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Floppy Disk Interface

Standard Electronic and Physical Interface

Table A-6. Output and Input Sign als

Driver Output Signals

Receiver Input Sign als

T-

T+

Tied to +5 volt supply through 150 ohm resist ors. Schm itt Trigger wit h

0.8-volt hys teres is .

Connector

0 volts minimum 0.5 volts maxim um Open collector 5.25 volts maximum 60 mA

0.1 mA

1.0 volts maximum

1.4 volts minimu m

The floppy disk interface connec tor should be an unshr ouded 34-pin header.

❒

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I/O Operating Environment

About This Appendix

Read this appendix to find out:

If embedded support for your host adapter is available

•

with your operatin g system Whether or not you need additional softw are for you r host

•

adapter in the DOS/Windows environmen t Information on Adaptec’s EZ-SCSI I/O Operating

•

Environme nt Softwar e that makes driver installation easier than ever before

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Host Adapter Support

You may not need to install additional environment softwar e in order to use your host adapter. Adaptec is working with major operating system supplier s to provide embedd ed supp or t in their operating systems. Please contact Adaptec or your operatin g system vendor for information on the current schedu le for I/O Operating Env ironmen t Software support.

Note

Until embedded support is provided for your particular operating system, host adapter drivers for the AHA-2740 Series may be availabl e from Adaptec. To order Adaptec software, call the number for ordering Adaptec software listed in the Adaptec Techn ic al Su p po rt section found in Chapter 1, Introduction.

DOS/Windows

Under MS-DOS® 5.0 or higher, up to seven SCSI hard disk drives per host adapter (eight total) can be connected without additional software (older versions of DOS support up to two hard disk drives). Additional so ftwar e is requir ed if you desir e to do any of the following:

Support more than two fix ed disk driv es un der version s of

•

DOS prior to MS-DOS 5.0 Support more than eight fix ed disk dr ive s (seven per host

•

adapter) under MS-DOS 5.0 or higher Remove or switch remov able media (for example,

•

Bernoull i Support CD-ROM drives

•

Support devic es other than CD- ROM dr ives and disk

•

drives–for example: SCSI tape drives, scanners, plotters, or worm dr ives

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cartridges) while y ou r compu ter is running

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Adaptec EZ-SCSI

If you are running MS-D OS or MS-D O S with Win dow s, Adaptec EZ-SCSI I/O Operating Environment Software makes driver installation easier than ever before. Adaptec EZ-SCSI is a menu-driven software package that configures your operating environme nt automatically .

Adaptec EZ-SCSI ha s a number of utility prog r a ms including

afdisk

and

scsifmt

, which are used to format and partition SCSI disk devices. Adaptec EZ- SCSI also inc lu des an A SPI device driver called and the

aspicd

aspidisk

that supports most models of CD-ROM drives

device driver, which supports up to 24 fixed- disk

devices. To install support for SCSI devices other than fixed disk devices

and CD-ROM driv es, chec k the hard war e doc umen t atio n for those devices. If the device requires ASPI support, you first need to run Adaptec EZ-SCSI to install an ASPI manager, and then install any other software provided with the device. If the device is designed to interface dir ec tly with the host adapter, the n no ASPI manager is require d. Refer to the Adaptec EZ-SCSI User’s Manual for instructions on installing and running Adaptec EZ-SCSI.

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Optimizing Performance

About This Appendix

Read this appendix to find out:

How to optimize your system’s per for man c e after

•

installing the host adapter

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Performance Tips

Ther AHA-2740 Series is designed to maximize the performance of your SCSI devices and computer . The follow in g tips will help you take full advantage of the host adapter’s advanc ed design features.

Enabling Synchronous Negotiation

Synchronous negotiation is enabled (set to yes) by default on the AHA-2740 Series. You should normally enable this option on the host adapter because most SCSI devices support it and because it allows data to be transferred faster on the bus; however , becau s e a few SCSI devices (e.g., certain CD-RO M driv es) do not suppor t synchronous nego tiation and may malfun ction if they receive a request for it, you may want to disable synchro nous ne gotiation . See Configure BIOS and SCSI Dev ic e in Chapter 3.

Note

Even when synchronous negotiation is disabled on the host adapter, the host adapter will still switch to synchronous mode if it receives a request from the SCSI device.

Disabling the Host Adapter BIOS

Disabling the host adapter BIOS saves you 16 KBytes of memory address space and can also shorten boot-up time by as much as 60 seconds. See Configure the Host Adapter Parameters in Chapter

3. You should disable the host adapter BIOS if the peripherals on

the SCSI bus (for example, CD -RO M driv es) are all contr olled by device drivers and do not require BIOS control.

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Enabling SCSI Bus Parity

Parity check ing is a procedu r e used by the host adapter to verif y the accuracy of data transfer on the SCSI bus. Data verific a tion is a desirable option, so SCSI bus parity checking is normally enabled by default. To use this o ption most effectively, be sure that it is enabled on each SCSI device, as well as on the host adapter. To enable/disable SCSI Bus Parity Check on the host adapter, See Configure the Host Adapter Parameters in Chapter

3. Consult your hardwar e docu men tation for instru c tions on enabling parity che ckin g on periph er als.

Note

The only time when you should disa ble parit y c hecking on the host adapter is when your system includes a SCSI device that does not support this option. Again, consult the hardw are documentation for the device.

Setting Enable Disconnection

In the DOS environment you can increase performance slightly if you set Enable Disconnection to no when there is only a host adapter and a single disk device on the SCSI bus. You should set this option to yes, however, if you have more devices on the SCSI bus. See Configure the BIO S and SCSI D ev ic e in Chapter 3.

Send Start Unit Command

This option, which is suppor ted by some SCSI devic es, reduc es the load on your compu ter’ s pow er supply by allowing the h os t adapter to power-up disk devices and other peripherals one-at-atime when you boot your sys tem. Oth er w ise , the periph er als will all power-up at the same time.

Send Start Unit Command is disabled (set to no) by default. Check your hardwar e doc u men tation before y ou enable (set to yes) this optio n to make sure your dev ic es suppor t it. Then chan g e the switch or jumper settings on the device to enable the option s. To enable/disable Send Start Unit Command, See Configure the BIOS and SCSI Device in Chapter 3.

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Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page C-4) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93

Optimizing Per formance

Try enabling Send Start Unit Command for one peripheral at a time, rebooting each time to make sure each SC SI device wor ks properly. (Some older disk devices do no t sup por t thi s option and may malfunction if they receive the command.)

Note

The Send Start Unit Command has no effect if the host adapter BIOS is disabled.

DOS/Windows Performance

Adaptec’s EZ-SCSI I/O Operating Environment Software is designed not only to simplify installation of device drivers under DOS, but also includes ASPI management software to provide Virtual DMA Services (VDS) support and enhanced Windows support. The drivers that are installed will give DOS users the best performance possible under not only DOS, but Windows.

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Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page C-5) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93

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Disk Drives Over 1 Gigabyte

About This Appendix

Read this appendix to find out:

An overview of extended translation and the D OS 1 G Byte

•

limit When to use the extended translation feature

•

Questions and answers about extended translation

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Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page D-1) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93

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Adaptec AHA-2742A, AHA-2742A-TWIN User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual