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SYSTEM SCHEMATICS

A2091

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DECEMBER, 1989 PN-314674-01

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SYSTEM SCHEMATICS

A2091

DECEMBER, 1989 PN-314674-01

INTERNATIONAL EDITION

COMMODORE “INTERNATIONAL EDITION” SERVICE MANUALS CON
TAIN PART NUMBER INFORMATION WHICH MAY VARY ACCORDING TO
COUNTRY. SOME PARTS MAY NOT BE AVAILABLE IN ALL COUNTRIES.

Commodore Business Machines, Inc.

1200 Wilson Drive, West Chester, Pennsylvania 19380 U.S. A.

Commodore makes no expressed or implied war
ranties with regard to the information contained
herein. The information is made available solely on
an as is basis, and the entire risk as to quality and
accuracy is with the user. Commodore shall not be
liable for any consequential or incidental damages
in connection with the use of the information con
tained herein. The listing of any available replace
ment part herein does not constitute in any case
a recommendation, warranty or guaranty as to
quality or suitability of such replacement part.
Reproduction or use without expressed permission,
of editorial or pictorial content, in any matter is
prohibited.

This manual contains copyrighted and proprietary information. 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 permis
sion of Commodore Electronics Limited.

Copyright © 1989 by Commodore Electronics Limited.
All rights reserved.

A2091 SYSTEM SCHEMATICS

TABLE OF CONTENTS

• SPECIFICATIONS

• PARTS LISTS

• SCHEMATICS

NOTE

PLEASE REFERENCE A2091 USER MANUAL
PN-363227-02 FOR DETAILED OPERATIONS.

A2091 SYSTEM SCHEMATICS

A2091-40 SPECIFICATIONS

DESCRIPTION

This specification describes the Functional Requirements for an A2091-40 hard disk upgrade kit.

CONTENTS

The A2091-40 hard disk upgrade kit contains the following items:

A. A2091 Hard disk controller board
B. Cables for card-mounting hard disk drive
C. Quantum pro-drive 40S hard disk drive
D. Cable for mounting hard drive in drive bay

An A2091-40 upgrades an A2000 to an A2000HD.

E. Shock mounts for hard drive
F. Stiffening rod for A2000
G. Foam pad for A2000
H. A2000HD sticker for front panel of A2000

PARAMETERS

Dimensions:
Weight:
Power requirements:

PCB:
Hard drive:

Hard drive features:

PCB 13.25 inches; Hard drive 6 inches by 4.25 inches by 2 inches
5 lbs.

+ 12V 0.0A, +5V 1.0A
+ 12V 1.6A, +5V 0.7A Power up; + 12V 0.8A, + 5V 0.6A Normal operation

42 MB formatted capacity; 19 ms seek time; supports disconnect/reselect; 64K byte look
ahead cache; 1:1 interleave

A2091 SPECIFICATIONS

DESCRIPTION

This specification describes the Functional Requirements for an A2091 hard disk controller assembly.

PARAMETERS

Dimensions: PCB 13.25 inches by 5 inches
Weight: 1 lb.
Power Requirements:

Without a hard drive mounted to card:

+ 12V 0.0 A
+ 5V 1.0 A

With hard drive mounted to card:

+ 12V 2.5 A max startup, 0.9 A max continuous
+ 5V 2.5 A continuous

Features: Hard disk controller for SCSI or XT style drives; Sockets for up to 2 MByte fast RAM;

Auto-boot ROMs; Boots directly into Fast File System; Rear socket permits connection
of Macintosh style SCSI expansion devices; Space on card to mount user’s own 3.5" hard
drive

1

A2091 SYSTEM SCHEMATICS

JUMPERS

JP1 is used to set the amount of memory on the board. It has 4 positions that represent no memory, 512K, 1M and
2M of memory.

JP2 is used to enable and disable the auto-boot ROMs. The ROMs must be disabled when the board is installed in
an A2000 with KS1.2 ROMs. The position marked “ AUTO” enables the auto-boot ROMs and the position marked

“ D1S” disables the autoboot ROMs.
JP3 determines the interrupt level that the board generates and is not user adjustable. It is factory wired to INT2.
JP5 is a software readable set of 3 jumpers. The function depends on the driver software, but with V4.4 of the driver

the function is as follows:

Jumper 1: Enable Multiple LUNs
Jumper 2: Enable long boot timeout, disable parity check
Jumper 4: Undefined

JP201 determines the clock rate fed into the WD33C93 SCSI controller IC. It is factory wired for a 7 MHz clock
rate and is not user adjustable. If an end user would like to replace the standard WD33C93 with a high speed version
of the part, the trace between the upper 2 pins of JP201 can be cut, and the lower 2 pins wired together. This would
result in a 14 MHz clock rate which would effectively double SCSI throughput given a hard drive that can operate
at that speed.

Factory settings are as follows:

JP1

OK (no memory)

JP2

DIS (Autoboot disabled)

JP3

INT2

JP5 ALL 3 functions disabled
JP201

7 MHz

CONNECTORS

CN1 (Not labeled on board) 100 pin Amiga edge card connector
Designed to plug into a standard A2000 100 pin Amiga slot.

CN2 XT LED
This is designed to accept the plug from the hard disk LED on the front panel of the A2000 if the user is using an
XT drive. This connector will light the front panel LED whenever the XT drive is accessed.

CN3 SCSI LED
This is designed to accept the plug from the hard disk LED on the front panel of the A2000 if the user is using a
SCSI drive. This connector will light the front panel LED whenever any SCSI device is accessed.

CN4 XT drive connector
This 40 pin connector is designed to attach to a ribbon cable that connects to an XT hard drive.

CN5 External SCSI connector
This DB25 connector is designed to connect the A2091 to external SCSI devices. It uses a pinout identical to the Apple
Macintosh (R) SCSI connector and has the capability of connecting to any peripheral that is designed to connect to
the Macintosh (R). Up to 7 external devices may be connected by daisy-chaining.

CN6 Internal SCSI connector

This 50 pin header is designed to attach to 1 or more (up to 7) internal SCSI devices. Multiple devices are connected

by crimping multiple connectors onto 1 ribbon cable.
CN7 Power connector

This 4 pin molex connector supplies power to a 3.5" hard drive that the user may install on the A2091. The maximum
power that may be drawn from this connector is as follows:

+ 12V: 2.5A max startup (8 sec), 0.9A max continuous; +5V: 1.5A max continuous

MOUNTING OF HARD DRIVE

Space is provided on the A2091 for the end user to mount a 3.5 inch hard drive. Mounting hardware is not included,
and a cable is required to allow the hard drive to draw its power from the A2091, CPN 312646-01.

2

A2091 SYSTEM SCHEMATICS

313441-01

A2091 MAJOR PARTS LIST

A2091-40 SHIPPING ASSEMBLY-U.S.
313441-02 A2091-40 SHIPPING ASSEMBLY-GERMANY
313441-03

A2091-40 SHIPPING ASSEMBLY-EF1GS.
313441-04 A2091-40 SHIPPING ASSEMBLY-SCANDI.
313441-05

A2091-40 SHIPPING ASSEMBLY-CANADA
313441-06

A2091-40 SHIPPING ASSEMBLY-AUSTRALIA
363243-01

BULK PACKING BOX
363242-02

PACKING BOX
318900-01

WARRANTY CARD U.S.
318882-01

WARRANTY CARD CANADA
318884-01

WARRANTY CARD AUSTRALIA
314877-02 SERVICE CENTER LIST U.S.
363033-01 A2091 USER MANUAL - EFIGS
363034-01

A2091 USER MANUAL - SCANDI
363227-02 C A2091 USER MANUAL - ENGLISH
252253-12 PLASTIC BAG

317806-01 C

DISKETTE - INSTALL (US)

317807-01 c DISKETTE - INSTALL (GER)

318896-01

SOFTWARE LICENSE U.S. & CANADA
312341-02 DISKETTE REPLACEMENT CARD (US)
318556-02 DISKETTE REPLACEMENT CARD (CANADA)
312773-01 A2091 MAIN ASSEMBLY
312778-01

BRACKET, MOUNTING (ON MAIN ASSY)

906610-01 SCREW PHILIPS 6-32 (QTY =4, MAIN ASSY)

905970-04 c

NUT, KEPS 6-32 (QTY = 8, 4 ON MAIN ASSY, 4 FOR HD MOUNT)
316754-01 UPC LABEL

312646-01 c CABLE, POWER
312573-01 c

CABLE, DATA 50P SHORT

313439-01 c

CABLE, DATA 50P LONG

313440-01 c

DRIVE, HARD 40MB SCSI QUANTUM
312713-01

c TIE BAR

312748-01

c

ISOLATOR, VIBRATION

311554-01 c

NAMEPLATE (AMIGA 2000HD STICKER)

312749-01 c

FOAM SUPPORT

907272-02 c

WASHER, FLAT
905960-04

c

NUT, HEX M3

312769-01 c

A2091 PCB ASSEMBLY - REV 4

312770-01

SCHEMATIC - PCB REV 4

312771-01

FABRICATION - PCB REV 4

312772-01

ARTWORK - PCB REV 4

3

A2091 SYSTEM SCHEMATICS

COMPONENT PARTS LIST
PCB ASSEMBLY #314386-03

Commodore part numbers are provided for reference only and do not indicate the availability of parts from Commodore.

Industry standard parts (Resistors, Capacitors, Connectors) should be secured locally. Approved cross-references for TTL chips,

Transistors, etc. are available in manual form through the Service Department, order #314000-01.

IC COMPONENTS

390333-03

16L 8 A R A M C O N T R O L L E R

U5 P R O G R A M M E D
IN T O P / N 390071-02

390332-01

74 F158A

U8 ,U 9

901521-46

74 LS2 4 5 U2,U 3
390563-02 D M A C U1
390206-01

W D 3 3 C 9 3

U4

901522-30

7407 U7

390617-01

74ALS32

U l l

901521-03

74L S08 U10
901521-32 7 4 LS86 U6

390509-02 EP R O M P R O G R A M M E D , O D D D R I V E R

U1 2 P R O G R A M M E D
IN T O P / N 380204-01

390508-02 EP R O M P R O G R A M M E D , E V E N U13 P R O G R A M M E D

D R I V E R IN T O P /N B 380204-01

MISCELLANEOUS

904150-08

S O C K E T 20 P I N I C U5 ,U 14-29
904150-05

S O C K E T 28 P I N 1C

U 12,U 13
904150-06 S O C K E T 40 PIN I C U4
390185-01 S O C K E T 84 P IN I C

U1
251842-02 F I L T E R S E M I lOOpF

EM I 16

390017-01 D I O D E 1N914 D1
390331-01 C ON N P O W E R 4 P IN CN 7
316755-01 L A B E L , F C C ID A2091

RESISTORS

901550-105 33 O H M 1/4W R 1,3,9-11
901550-01 1 K O H M 1/4W R2,4 ,6,8,101
901 5 5049

100 O HM 1/4W

R12

901550-131 56 O HM 1/4W

R7

380388-04

220/33 0 O H M /10 P I N /8 E L E M E N T S / S IP

RN 1 ,RN 3

380388-01

220/33 0 O H M /6 P IN /4 E L E M E N T S / S I P

RN2

390227-04

33 O H M / l O P IN /9 E L E M E N T /S IP RN6-R N8

902410-08

4.7 K / 1 0 PIN /9 E L E M E N T / S IP RN 4 ,R N 5

902410-06

3.3 K /1 0PIN / 9 E L E M E N T /S I P

RN201

CAPACITORS

900020-09 .33u F , R A D IA L L E A D , Z 5 U C3-5,7 - 16,1 9,20,23 ,24,

27,28,31

251894-24 E L E C T R A D I A L L E A D 22uF 16V C3 2 ,3 3

CONNECTORS

903345-25

50 P IN , D IL CN 6

903345-20 40 P IN , D I L

CN 4

903332-03

3 P IN , S I L

C N 3,J P 2

390241-05

25 P IN “ D ” SU B , R I G H T A N G L E

CN 5
903345-04 H E A D E R 2 B Y 4 JP1
903345-03

H E A D E R 2 BY 3 JP5

390333-01 J U M P E R

4

SEE NOTE 1

SEE NOTE 3

NOTES: (UNLESS OTHERWISE SPECIFIED)

1) SET ONE JUMPER ON JP1 IN “OK” POSITION.

2) SET ONE JUMPER ON JP2 IN “AUTO” POSITION.

3) SET THREE JUMPERS ON JP5 BUT ONLY ON 1 PIN.

PCB Assembly #314386-03

A2091 SYSTEM SCHEMATICS

Schematic #312770

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A2091 SYSTEM SCHEMATICS

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8

r

o Commodore

Computer Systems Division

1200 Wilson Drive

West Chester, PA 19380

V.

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