Acrosser AR-B9622 User Manual
AR-B9622 User’s Guide
AR-B9622
Half Size All-In-One
386SX CPU BOARD
User’s Guide
Edition: 1.43
Book Number: AR-B9622-05.0615
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AR-B9622 User’s Guide
Table of Contents
0. PREFACE...........................................................................................................................................................0-4
0.1 COPYRIGHT NOTICE AND DISCLAIMER............................................................................................................................0-4
0.2 WELCOME TO THE AR-B9622 CPU BOARD....................................................................................................................... 0-4
0.3 BEFORE YOU USE THIS GUIDE.......................................................................................................................................... 0-4
0.4 RETURNING YOUR BOARD FOR SERVICE ....................................................................................................................... 0-4
0.5 TECHNICAL SUPPORT AND USER COMMENTS............................................................................................................... 0-4
0.6 ORGANIZATION.................................................................................................................................................................... 0-5
0.7 STATIC ELECTRICITY PRECAUTIONS ............................................................................................................................... 0-5
1. OVERVIEW.........................................................................................................................................................1-1
1.1 INTRODUCTION....................................................................................................................................................................1-1
1.2 PACKING LIST....................................................................................................................................................................... 1-1
1.3 FEATURES ............................................................................................................................................................................ 1-1
2. SYSTEM CONTROLLER....................................................................................................................................2-1
2.1 MICROPROCESSOR ............................................................................................................................................................2-1
2.2 DMA CONTROLLER.............................................................................................................................................................. 2-1
2.3 KEYBOARD CONTROLLER..................................................................................................................................................2-2
2.4 INTERRUPT CONTROLLER ................................................................................................................................................. 2-2
2.4.1 I/O Port Address Map..................................................................................................................................................... 2-3
2.4.2 Real-Time Clock and Non-Volatile RAM........................................................................................................................ 2-4
2.4.3 Timer.............................................................................................................................................................................. 2-4
2.5 SERIAL PORT........................................................................................................................................................................ 2-5
2.6 PARALLEL PORT.................................................................................................................................................................. 2-7
3. SETTING UP THE SYSTEM...............................................................................................................................3-1
3.1 OVERVIEW............................................................................................................................................................................ 3-1
3.2 SYSTEM SETTING................................................................................................................................................................ 3-2
3.2.1 Keyboard Connector ...................................................................................................................................................... 3-2
3.2.2 PC/104 Connector.......................................................................................................................................................... 3-3
3.2.3 Hard Disk (IDE) Connector (CN3)..................................................................................................................................3-5
3.2.4 PS/2 Mouse Connector (J2)...........................................................................................................................................3-6
3.2.5 FDD Port Connector (CN7)............................................................................................................................................ 3-6
3.2.6 Reset Header (J3)..........................................................................................................................................................3-6
3.2.7 Parallel Port Connector (CN8 & CN9)............................................................................................................................3-7
3.2.8 Power Connector (J7 & J8)............................................................................................................................................ 3-7
3.2.9 Serial Port....................................................................................................................................................................... 3-8
3.2.10 Compact Flash Connector (CN2).............................................................................................................................3-10
3.2.11 RJ-45 Connector (CN4) ........................................................................................................................................... 3-11
3.2.12 CPU Base Clock Select (JP2).................................................................................................................................. 3-11
3.2.13 D.O.C. Installation (U7)............................................................................................................................................ 3-11
4. CRT/LCD FLAT PANEL DISPLAY.....................................................................................................................4-1
4.1 LCD FLAT PANEL DISPLAY .................................................................................................................................................4-1
4.2 CRT & LCD DISPLAY ............................................................................................................................................................ 4-3
4.2.1 CRT Connector (CN6 & DB1) ........................................................................................................................................ 4-3
4.2.2 LCD Setting.................................................................................................................................................................... 4-3
5. INSTALLATION..................................................................................................................................................5-1
5.1 OVERVIEW............................................................................................................................................................................ 5-1
5.2 UTILITY DISKETTE ............................................................................................................................................................... 5-1
5.2.1 VGA Driver..................................................................................................................................................................... 5-2
5.2.2 BIOS FLASH Utility ........................................................................................................................................................ 5-2
5.2.3 Network Utility ................................................................................................................................................................ 5-2
5.3 WATCHDOG TIMER.............................................................................................................................................................. 5-3
5.3.1 Watchdog Timer Setting................................................................................................................................................. 5-3
5.3.2 Watchdog Enabled/Disabled - INDEX 37H.................................................................................................................... 5-4
5.3.3 Select Watchdog Report Signal - INDEX 38H ............................................................................................................... 5-4
5.3.4 Timeout Status & Reset Watchdog - INDEX 3CH ..................................................................................................................... 5-4
5.3.5 Programming Watchdog - Basic Operation.................................................................................................................... 5-4
6. BIOS CONSOLE.................................................................................................................................................6-1
6.1 BIOS SETUP OVERVIEW ..................................................................................................................................................... 6-1
6.2 STANDARD CMOS SETUP................................................................................................................................................... 6-2
6.3 ADVANCED CMOS SETUP................................................................................................................................................... 6-3
6.4 ADVANCED CHIPSET SETUP.............................................................................................................................................. 6-5
6.5 PERIPHERAL SETUP............................................................................................................................................................ 6-6
6.6 AUTO-DETECT HARD DISKS............................................................................................................................................... 6-7
6.7 PASSWORD SETTING.......................................................................................................................................................... 6-7
6.7.1 Setting Password ........................................................................................................................................................... 6-7
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AR-B9622 User’s Guide
6.7.2 Password Checking........................................................................................................................................................ 6-7
6.8 LOAD DEFAULT SETTING.................................................................................................................................................... 6-7
6.8.1 Auto Configuration with Optimal Setting ........................................................................................................................ 6-7
6.8.2 Auto Configuration with Fail Safe Setting....................................................................................................................... 6-7
6.9 BIOS EXIT.............................................................................................................................................................................. 6-8
6.9.1 Save Settings and Exit................................................................................................................................................... 6-8
6.9.2 Exit Without Saving........................................................................................................................................................ 6-8
6.10 BIOS UPDATE................................................................................................................................................................... 6-8
7. SPECIFICATIONS..............................................................................................................................................7-1
8. PLACEMENT & DIMENSIONS...........................................................................................................................8-1
8.1 PLACEMENT .........................................................................................................................................................................8-1
8.2 DIMENSIONS......................................................................................................................................................................... 8-2
9. PROGRAMMING RS-485 & INDEX....................................................................................................................9-1
9.1 PROGRAMMING RS-485...................................................................................................................................................... 9-1
9.2 INDEX ....................................................................................................................................................................................9-3
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AR-B9622 User’s Guide
0.PREFACE
0.1 COPYRIGHT NOTICE AND DISCLAIMER
December 1998
Acrosser Technology makes no representations or warranties with respect to the contents hereof and s pecifically
disclaims any implied warranties of merchantability or fitness for any particular purpose. Furthermore, Acrosser
Technology reserves the right to revise this publication and to make changes from time to time in the contents
hereof without obligation of Acrosser Technology to notify any person of such revisions or changes.
Possession, use, or copying of the software described in this publication is authorized only pursuant to a valid
written license from Acrosser or an authorized sublicensor.
(C) Copyright 錯誤! 尚未定義書籤。 Acrosser Technology Co., Ltd., 1998. All rights Reserved.
No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval s ystem, or translated
into any language or computer language, in any form or any me ans, electronic, mechanical, magnetic, optical,
chemical, manual or otherwise, without the prior written consent of Acrosser Technology.
Acrosser, AMI, IBM PC/AT, ALI, Windows 3.1, MS-DOS, …are registered trademarks.
All other trademarks and registered trademarks are the property of their respective holders.
This document was produced with Adobe Acrobat 3.01.
0.2 WELCOME TO THE AR-B9622 CPU BOARD
This guide introduces the Acrosser AR-B9622 CPU board.
Use the information describes this card’s functions, features, and how to start, set up and operate your A R-B9622.
You can also find general system information here.
0.3 BEFORE YOU USE THIS GUIDE
If you have not already installed this AR-B9622, refer to the Chapt er 3, “Setting Up the System” in this guide.
Check the packing list, make sure the accessories are in the package.
AR-B9622 diskette provides the latest information about the card. Please refer to the README.DOC file of the
enclosed utility diskette. It contains the modification and hardware & software information, and adding the
description or modification of product function after manual published.
0.4 RETURNING YOUR BOARD FOR SERVICE
If your board requires servicing, contact the dealer from whom you purchased the product for service information.
If you need to ship your board to us for service, be sure it is packed in a protective carton. We recommend that
you keep the original shipping container for this purpose.
You can help assure efficient servicing of your product by following these guidelines:
1. Include your name, address, telephone and facsimile number where you may be reached during the day.
2. A description of the system configuration and/or software at the time of malfunction.
3. A brief description of the symptoms.
0.5 TECHNICAL SUPPORT AND USER COMMENTS
User’s錯誤! 尚未定義書籤。 comments are always welcome as they assist us in improving the usefulness of our
products and the understanding of our publications. They form a ver y important part of the input used for product
enhancement and revision.
We may use and distribute any of the information you supply in any way we believe appropriate without incurring
any obligation. You may, of course, continue to use the information you supply.
If you have suggestions for improving particular sections or if you find any errors, please indicate the manual title
and book number.
Please send your comments to Acrosser Technology Co., Ltd. or your local sales representative.
Internet electronic mail to: webmaster@acrosser.com
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AR-B9622 User’s Guide
0.6 ORGANIZATION
This information for users covers the following topics (see the Table of Contents for a detailed listing):
Chapter 1, “Overview”, provides an overview of the system features and packing list.
Chapter 2, “System Controller” describes the major structure.
Chapter 3, “Setting Up the System”, describes how to adjust the jumper, and the connectors setting.
Chapter 4, “CRT/LCD Flat Panel Display”, describes the configuration and installation procedure usi ng
LCD display.
Chapter 5, “Installation”, describes setup procedures including information on the utility disk ette.
Chapter 6, “BIOS Console”, providing the BIOS options setting.
Chapter 7, Specifications
Chapter 8, Placement & Dimensions
Chapter 9, Programming RS-485 & Index
0.7 STATIC ELECTRICITY PRECAUTIONS
Before removing the board from its anti-static bag, read this section about static electricity precautions.
Static electricity is a constant danger to the computer systems. The charge that can build up in your body may be
more than sufficient to damage integrated circuits on any PC board. It is, therefore, important to observe basic
precautions whenever you use or handle co mputer components. Although areas with humid climates are much
less prone to static build-up, it is always the best to safeguard against accidents which may result in e xpensive
repairs. The following measures should generally be sufficient to protect your equipment from static discharge:
• Touch a grounded metal object to dischar ge the static electricity in your body (or ideally, wear a groun ded
wrist strap).
• When unpacking and handling the board or other s ystem components, place all materials on an antic static
surface.
• Be careful not to touch the components on the board, especially the “golden finger” connectors on the bottom
of every board.
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AR-B9622 User’s Guide
1. OVERVIEW
This chapter provides an overview of your system features and capabilities. The following topics are covered:
Introduction
Packing List
Features
1.1 INTRODUCTION
The AR-B9622 is a new generation half-size, 386SX board. This card offers much greater performance than the
older cards such as support for onboard 4MB DRAM and one RS-232C/485 and three RS-232C p orts and one
socket for the DiskOnChip from 2MB up to 72MB.
The unit also comes with a programmable watch dog timer and other typi cal interfaces. The 386 CPU board is
excellent for embedded systems, MMI’s, work stations, medical applications or POS/POI systems. As well, an
RS-232C/485 port provides the remote control. RS-485 interface is only offered recently on 386 cards.
Especially the AR-B9622’s on-board VGA, offers the most exciting possibilities yet to the industry. The on-board
VGA/LCD controller brings about a whole new dimension of industrial computing. No longer do you have to worry
about adding an extra card to your system. The VGA/LCD unit comes with 1MB V-RAM on board and uses the
C&T 65545 Chipset, to support a wide range of LCD Panels.
1.2 PACKING LIST
The accessories are included with the system. Before you begin installi ng your AR-B9622 board, take a moment
to make sure that the following items have been included inside the AR-B9622 package.
The quick setup manual
1 AR-B9622 all-in-one single CPU board
1 Hard disk drive interface cable
1 VGA 10-pin cable
2 Parallel port interface cables
1 Keyboard adapter
1 PS/2 mouse adapter
4 phone-jack to DB-9 adapters
2 Software utility diskettes
1.3 FEATURES
The system provides a number of special features that enhance its reliabi lit y, ensure its availabil ity, and improve its
expansion capabilities, as well as its hardware structure.
80386SX-33/40 MHz CPU
PC/104 extension bus
On-board CRT and LCD panel display
Supports IDE hard disk drives
Supports floppy disk drives
Supports 2 bi-directional parallel port
PC/AT compatible keyboard
Up to 72MB for one DiskOnChip
Programmable watchdog timer
Flash BIOS
Signal 5V power requirement
Multi-layer PCB for noise reduction
Dimensions : 145mmX142mm
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AR-B9622 User’s Guide
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AR-B9622 User’s Guide
2. SYSTEM CONTROLLER
This chapter describes the major structure of the AR-B9622 CPU board. The following topics are covered:
Microprocessor
DMA Controller
Keyboard Controller
Interrupt Controller
Serial Port
Parallel Port
2.1 MICROPROCESSOR
The AR-B9622 uses the ALI M6117 CPU; it is designed to perform systems like Intel’s 386SX system with deep
green features.
The 386SX core is the same as M1386SX of Acer Labs. Inc. and 1 0 0 % o b j e ct c o d e c o mp a t ib l e w i th t h e I n t e l
38 6S X microprocessor. System manuf acturers can provide 386 CPU based systems optimized for both cost and
size. Instruction pipelining and high bus bandwidth ensure short average instruction execution time and high
system throughput. Furthermore, it can keep the state internally from charge leakage while external clock to the
core is stopped without storing the data in registers. The power consumption here is almost zero until the clock
stops. The internal structure of this core is 32-bit data and address bus with very lo w supply current. Real mode
as well as Protected mode are available and can run MS-DOS /MS-Windows.
2.2 DMA CONTROLLER
The equivalent of two 8237A DMA controllers are implemented in th e AR-B9622 board. Each controller is a fourchannel DMA device that will generate the memory addresses and control signals necessary to transfer
info r mati o n dir ectl y bet ween a peripheral device and memory. This allows high speeding information trans f er wi t h less
CPU intervention. The two DMA controllers are internally cascaded to pr ovide four DMA channels for transfers to
8-bit peripherals (DMA1) and three channels for transfers to 16-bit peripherals (DMA2). DMA2 channel 0 provides
the cascade interconnection between the two DMA devices, thereby maintaining IBM PC/AT compatibility.
The following is the system information of DMA channels:
DMA Controller 1 DMA Controller 2
Channel 0: Spare Channel 4: Cascade for controller 1
Channel 1: IBM SDLC Channel 5: Spare
Channel 2: Diskette adapter Channel 6: Spare
Channel 3: Spare Channel 7: Spare
Table 2-1 DMA Channel Controller
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AR-B9622 User’s Guide
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2.3 KEYBOARD CONTROLLER
The 8042 processor is programmed to support the keyboard serial interface. The keyboard controller receives
serial data from the keyboard, checks its parity, translates scan codes, and presents it to the system as a byte data
in its output buffer. The controller can interrupt the system when data is place d in its output buffer, or wait for the
system to poll its status register to determine when data is available.
Data can be written to the keyboard by writing data to the output buffer of the keyboard controller.
Each byte of data is sent to the keyboard controller in seri es with an odd parity bit automatically inserted. The
keyboard controller is required to acknowledge all data transmissions. Therefore, another byte of data will not be
sent to keyboard controller until acknowledgment is received for the previous byte sent. The “output buffer full”
interruption may be used for both send-and-receive routines.
2.4 INTERRUPT CONTROLLER
The equivalent of two 8259 Programmable Interrupt Controllers (PIC) are included on the AR-B9622 board. They
accept requests from peripherals, resolve priorities on pending interrupts in service, issue interrupt req uests to the
CPU, and provide vectors which are used as acceptance indices by the CP U to determine which interrupt service
routine to execute.
The following is the system information of interrupt levels:
InInterrupt Level
Description
NMI
CTRL1
IRQ 0
IRQ 1
IRQ 2
IRQ 3
IRQ 4
IRQ 5
IRQ 6
IRQ 7
Parity check
CTRL2
System timer interrupt from timer 825
Keyboard output buffer full
Rerouting to IRQ8 to IRQ15
IRQ8 : Real time clock
IRQ9 : Serial port 4
IRQ10 : LAN adapter
IRQ11 : Serial port 3
IRQ12 : Reserved for PS/2 mouse
IRQ13 : Math. coprocessor
IRQ14 : Hard disk adapter
IRQ15 : Reserved for Compact Flash
Serial port 2
Serial port 1
Parallel port 2
Floppy disk adapter
Parallel port 1
Figure 2-1 Interrupt Controller
2-2
2.4.1 I/O Port Address Map
Hex Range Device
000-01F DMA controller 1
020-021 Interrupt controller 1
022-023 ALI M6117 chipset address
040-04F Timer 1
050-05F Timer 2
060-06F 8042 keyboard/controller
070-071 Real-time clock (RTC), non-maskable interrupt (NMI)
080-09F DMA page registers
0A0-0A1 Interrupt controller 2
0C0-0DF DMA controller 2
0F0 Clear Math Co-processor
0F1 Reset Math Co-processor
0F8-0FF Math Co-processor
170-178 Fixed disk 1
1F0-1F8 Fixed disk 0
201 Game port
208-20A EMS register 0
218-21A EMS register 1
278-27F Parallel printer port 2 (LPT 2)
2E8-2EF Serial port 4 (COM 4)
2F8-2FF Serial port 2 (COM 2)
300-31F Prototype card/streaming type adapter
320-33F LAN adapter
378-37F Parallel printer port 1 (LPT 1)
380-38F SDLC, bisynchronous
3A0-3AF Bisynchronous
3B0-3BF Monochrome display and printer port 3 (LPT 3)
3C0-3CF EGA/VGA adapter
3D0-3DF Color/graphics monitor adapter
3E8-3EF Serial port 3 (COM 3)
3F0-3F7 Diskette controller
3F8-3FF Serial port 1 (COM 1)
Table 2-2 I/O Port Address Map
AR-B9622 User’s Guide
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AR-B9622 User’s Guide
2.4.2 Real-Time Clock and Non-Volatile RAM
The AR-B9622 contains a real-time clock compartment that maintains the date and time in addition to storing
configuration information about the computer system. It contains 14 bytes of clock and control registers and 114
bytes of general purpose RAM. Because of the use of CMOS technology, it consumes v er y little power and ca n be
maintained for long periods of time using an internal Lithium battery. The contents of each b yte in the CMOS RAM
are listed below:
Address Description
00 Seconds
01 Second alarm
02 Minutes
03 Minute alarm
04 Hours
05 Hour alarm
06 Day of week
07 Date of month
08 Month
09 Year
0A Status register A
0B Status register B
0C Status register C
0D Status register D
0E Diagnostic status byte
0F Shutdown status byte
10 Diskette drive type byte, drive A and B
11 Fixed disk type byte, drive C
12 Fixed disk type byte, drive D
13 Reserved
14 Equipment byte
15 Low base memory byte
16 High base memory byte
17 Low expansion memory byte
18 High expansion memory byte
19-2D Reserved
2E-2F 2-byte CMOS checksum
30 Low actual expansion memory byte
31 High actual expansion memory byte
32 Date century byte
33 Information flags (set during power on)
34-7F Reserved for system BIOS
Table 2-3 Real-Time Clock & Non-Volatile RAM
2.4.3 Timer
The AR-B9622 provides three programmable timers, each with a timing frequency of 1.19 MHz.
Timer 0 The output of this timer is tied to interrupt request 0. (IRQ 0)
Timer 1 This timer is used to trigger memory refresh cycles.
Timer 2 This timer provides the sp eaker tone.
Application programs can load different counts into this timer to generate various sound frequencies.
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AR-B9622 User’s Guide
2.5 SERIAL PORT
The ACEs (Asynchronous Communication Elements ACE1 to ACE4) are used to convert parallel data to a serial
format on the transmit side and convert serial data to parallel on the rec eiver side. The serial format, in order of
transmission and reception, is a start bit, followed by five to eight data bits, a parity bit (if programmed) and one,
one and half (five-bit format only) or two stop bits. The ACEs are capable of handling divisors of 1 to 65535, and
produce a 16x clock for driving the internal transmitter logic.
Provisions are also included to use this 16x clock to drive the receiver logic. Also included in the ACE a completed
MODEM control capability, and a processor interrupt system that may be software tailored to the computing time
required to handle the communications link.
The following table is a summary of each ACE accessible register
DLAB Port Address Register
Receiver buffer (read) 0 base + 0
Transmitter holding register (write)
0 base + 1 Interrupt enable
X base + 2 Interrupt identification (read only)
X base + 3 Line control
X base + 4 MODEM control
X base + 5 Line status
X base + 6 MODEM status
X base + 7 Scratched register
1 base + 0 Divisor latch (least significant byte)
1 base + 1 Divisor latch (most significant byte)
Table 2-4 ACE Accessible Registers
(1) Receiver Buffer Register (RBR)
Bit 0-7: Received data byte (Read Only)
(2) Transmitter Holding Register (THR)
Bit 0-7: Transmitter holding data byte (Write Only)
(3) Interrupt Enable Register (IER)
Bit 0: Enable Received Data Available Interrupt (ERBFI)
Bit 1: Enable Transmitter Holding Empty Interrupt (ETBEI)
Bit 2: Enable Receiver Line Status Interrupt (ELSI)
Bit 3: Enable MODEM Status Interrupt (EDSSI)
Bit 4: Must be 0
Bit 5: Must be 0
Bit 6: Must be 0
Bit 7: Must be 0
(4) Interrupt Identification Register (IIR)
Bit 0: “0” if Interrupt Pending
Bit 1: Interrupt ID Bit 0
Bit 2: Interrupt ID Bit 1
Bit 3: Must be 0
Bit 4: Must be 0
Bit 5: Must be 0
Bit 6: Must be 0
Bit 7: Must be 0
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AR-B9622 User’s Guide
(5) Line Control Register (LCR)
Bit 0: Word Length Select Bit 0 (WLS0)
Bit 1: Word Length Select Bit 1 (WLS1)
WLS1 WLS0 Word Length
0 0 5 Bits
0 1 6 Bits
1 0 7 Bits
1 1 8 Bits
Bit 2: Number of Stop Bit (STB)
Bit 3: Parity Enable (PEN)
Bit 4: Even Parity Select (EPS)
Bit 5: Stick Parity
Bit 6: Set Break
Bit 7: Divisor Latch Access Bit (DLAB)
(6) MODEM Control Register (MCR)
Bit 0: Data Terminal Ready (DTR)
Bit 1: Request to Send (RTS)
Bit 2: Out 1 (OUT 1)
Bit 3: Out 2 (OUT 2)
Bit 4: Loop
Bit 5: Must be 0
Bit 6: Must be 0
Bit 7: Must be 0
(7) Line Status Register (LSR)
Bit 0: Data Ready (DR)
Bit 1: Overrun Error (OR)
Bit 2: Parity Error (PE)
Bit 3: Framing Error (FE)
Bit 4: Break Interrupt (BI)
Bit 5: Transmitter Holding Register Empty (THRE)
Bit 6: Transmitter Shift Register Empty (TSRE)
Bit 7: Must be 0
(8) MODEM Status Register (MSR)
Bit 0: Delta Clear to Send (DCTS)
Bit 1: Delta Data Set Ready (DDSR)
Bit 2: Training Edge Ring Indicator (TERI)
Bit 3: Delta Receive Line Signal Detect (DSLSD)
Bit 4: Clear to Send (CTS)
Bit 5: Data Set Ready (DSR)
Bit 6: Ring Indicator (RI)
Bit 7: Received Line Signal Detect (RSLD)
2-6
(9) Divisor Latch (LS, MS)
LS MS
Bit 0: Bit 0 Bit 8
Bit 1: Bit 1 Bit 9
Bit 2: Bit 2 Bit 10
Bit 3: Bit 3 Bit 11
Bit 4: Bit 4 Bit 12
Bit 5: Bit 5 Bit 13
Bit 6: Bit 6 Bit 14
Bit 7: Bit 7 Bit 15
Table 2-5 Serial Port Divisor Latch
AR-B9622 User’s Guide
Desired Baud Rate Divisor Used to Generate 16x Clock
300 384
600 192
1200 96
1800 64
2400 48
3600 32
4800 24
9600 12
14400 8
19200 6
28800 4
38400 3
57600 2
115200 1
2.6 PARALLEL PORT
(1) Register Address
Port Address Read/Write Register
base + 0 Write Output data
base + 0 Read Input data
base + 1 Read Printer status buffer
base + 2 Write Printer control latch
Table 2-6 Registers’ Address
(2) Printer Interface Logic
The parallel portion of the SMC37C669 makes the attachment of various devices that accept eight bits of parallel
data at standard TTL level.
(3) Data Swapper
The system microprocessor can read the contents of the printer’s Data Latch through the Data Swapper by reading
the Data Swapper address.
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AR-B9622 User’s Guide
(4) Printer Status Buffer
The system microprocessor can read the printer status by reading the address of the Printer Status Buffer. The bit
definitions are described below:
12345670
XXX
-ERROR
SLCT
PE
-ACK
-BUSY
Figure 2-2 Printer Status Buffer
NOTE: X represents not used.
Bit 7: T his signal may become active during data entry, when the printer is off-line dur ing printing, or when the
print head is changing position or in an error state. When Bit 7 is active, the printer is busy and can not
accept data.
Bit 6: This bit represents the current state of the printer’s ACK signal. A 0 means the printer has received the
character and is ready to accept another. Normally, this signal will be active for approximately 5
microseconds before receiving a BUS Y message stops.
Bit 5: A 1 means the printer has detected the end of the paper.
Bit 4: A 1 means the printer is selected.
Bit 3: A 0 means the printer has encountered an error condition.
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AR-B9622 User’s Guide
(5) Printer Control Latch & Printer Control Swapper
The system microprocessor can read the contents of the printer control latch by reading the address of printer
control swapper. Bit definitions are as follows:
XX
Figure 2-3 Bit’s Definition
NOTE: X represents not used.
Bit 5: Direction control bit. When logic 1, the output buffers in the parallel port are disabled allowing data driven
from external sources to be read; when logic 0, they work as a printer port. This bit is write only.
Bit 4: A 1 in this position allows an interrupt to occur when ACK changes from low state to high state.
Bit 3: A 1 in this bit position selects the printer.
Bit 2: A 0 starts the printer (50 microseconds pulse, minimum).
Bit 1: A 1 causes the printer to line-feed after a line is printed.
Bit 0: A 0.5 microsecond minimum highly active pulse clocks data into the printer. Valid data must be present
for a minimum of 0.5 microseconds before and after the strobe pulse.
12345670
STROBE
AUTO FD XT
INIT
SLDC IN
IRQ ENABLE
DIR(write only)
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