Acrosser Technology AR-B1476 User manual

AR-B1476
INDUSTRIAL GRADE
486DX/DX2/DX4 CPU CARD
User’ s Guide
Edition: 1.52
Book Number: AR-B1476-05.0525

AR-B1476 User’s Guide
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Table of Contents
0. PREFACE...........................................................................................................................................................0-3
0.1 COPYRIGHT NOTICE AND DISCLAIMER............................................................................................................................ 0-3
0.2 WELCOME TO THE AR-B1476 CPU BOARD....................................................................................................................... 0-3
0.3 BEFORE YOU USE THIS GUIDE.......................................................................................................................................... 0-3
0.4 RETURNING YOUR BOARD FOR SERVICE ....................................................................................................................... 0-3
0.5 TECHNICAL SUPPORT AND USER COMMENTS............................................................................................................... 0-3
0.6 ORGANIZATION.................................................................................................................................................................... 0-4
0.7 STATIC ELECTRICITY PRECAUTIONS ............................................................................................................................... 0-4
1. OVERVIEW.........................................................................................................................................................1-1
1.1 INTRODUCTION.................................................................................................................................................................... 1-1
1.2 PACKING LIST....................................................................................................................................................................... 1-2
1.3 FEATURES ............................................................................................................................................................................ 1-2
2. SYSTEM CONTROLLER....................................................................................................................................2-1
2.1 DMA CONTROLLER.............................................................................................................................................................. 2-1
2.2 KEYBOARD CONTROLLER.................................................................................................................................................. 2-1
2.3 INTERRUPT CONTROLLER ................................................................................................................................................. 2-2
2.3.1 I/O Port Address Map..................................................................................................................................................... 2-3
2.3.2 I/O Channel Pin Assignment (Bus1) .............................................................................................................................. 2-3
2.4 REAL-TIME CLOCK AND NON-VOLATILE RAM.................................................................................................................. 2-5
2.5 TIMER.................................................................................................................................................................................... 2-5
2.6 SERIAL PORT........................................................................................................................................................................ 2-6
2.7 PARALLEL PORT.................................................................................................................................................................. 2-8
3. SETTING UP THE SYSTEM...............................................................................................................................3-1
3.1 OVERVIEW............................................................................................................................................................................ 3-1
3.2 SYSTEM SETTING................................................................................................................................................................ 3-2
3.2.1 Hard Disk (IDE) Connector (CN1).................................................................................................................................. 3-2
3.2.2 FDD Port Connector (CN2)............................................................................................................................................ 3-3
3.2.3 Parallel Port Connector (CN4) ....................................................................................................................................... 3-3
3.2.4 PC/104 Connector.......................................................................................................................................................... 3-4
3.2.5 LED Header.................................................................................................................................................................... 3-6
3.2.6 Serial Port....................................................................................................................................................................... 3-7
3.2.7 Keyboard Connector (CN9 & J9) ................................................................................................................................... 3-9
3.2.8 External Speaker Header (J2)........................................................................................................................................ 3-9
3.2.9 Power Connector (J10) .................................................................................................................................................. 3-9
3.2.10 Reset Header (J8).................................................................................................................................................... 3-10
3.2.11 PS/2 Mouse Connector............................................................................................................................................ 3-10
3.2.12 CPU Setting ............................................................................................................................................................. 3-11
3.2.13 Memory Setting........................................................................................................................................................ 3-12
3.2.14 DiskOnChip Installation (SW1)................................................................................................................................. 3-13
4. CRT/LCD FLAT PANEL DISPLAY.....................................................................................................................4-1
4.1 CRT CONNECTOR (DB1) ..................................................................................................................................................... 4-1
4.2 LCD FLAT PANEL DISPLAY ................................................................................................................................................. 4-1
4.2.1 Inverter Board Description ............................................................................................................................................. 4-2
4.2.2 LCD Connector............................................................................................................................................................... 4-2
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 ........................................................................................................................................................ 5-4
5.3 WATCHDOG TIMER.............................................................................................................................................................. 5-5
5.3.1 Watchdog Timer Setting................................................................................................................................................. 5-5
5.3.2 Watchdog Timer Enabled............................................................................................................................................... 5-6
5.3.3 Watchdog Timer Trigger................................................................................................................................................. 5-6
5.3.4 Watchdog Timer Disabled.............................................................................................................................................. 5-6
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.............................................................................................................................................. 6-6
6.5 PERIPHERAL SETUP............................................................................................................................................................ 6-7
6.6 AUTO-DETECT HARD DISKS............................................................................................................................................... 6-7
6.7 PASSWORD SETTING.......................................................................................................................................................... 6-8
6.7.1 Setting Password ........................................................................................................................................................... 6-8
6.7.2 Password Checking........................................................................................................................................................ 6-8

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6.8 LOAD DEFAULT SETTING.................................................................................................................................................... 6-8
6.8.1 Auto Configuration with Optimal Setting ........................................................................................................................ 6-8
6.8.2 Auto Configuration with Fail Safe Setting....................................................................................................................... 6-8
6.9 BIOS EXIT.............................................................................................................................................................................. 6-9
6.9.1 Save Settings and Exit................................................................................................................................................... 6-9
6.9.2 Exit Without Saving........................................................................................................................................................ 6-9
6.10 BIOS UPDATE................................................................................................................................................................... 6-9
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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0.PREFACE
0.1 COPYRIGHT NOTICE AND DISCLAIMER
June 1998
This document is copyrighted, 1998, by Acrosser Technology Co., Ltd. All rights are reserved. No part of this
manual may be reproduced, copied, transcribed, stored in a retrieval system, or translated into any language or
computer language in any form or by any means, such as electronic, mechanical, magnetic, optical, chemical,
manual or other means without the prior written permission of original manufacturer.
Acrosser Technology assumes no responsibility or warranty with respect to the contents in this manual and
specifically disclaims any implied warranty of merchantability or fitness for any particular purpose. Furthermore,
Acrosser Technology reserves the right to make improvements to the products described in this manual at any
times without notice. Such revision will be posted on the Internet (WWW.ACROSSER.COM) as soon as possible.
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 sub licensor.
ACKNOWLEDGEMENTS
Acrosser, ALI, AMI, HMC, IBM PC/AT, Windows 3.1, Windows 95, Windows NT, AMD, Cyrix, Intel…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-B1476 CPU BOARD
This guide introduces the Acrosser AR-B1476 CPU board.
The information provided in this manual describes this card’s functions and features. It also helps you start, set up
and operate your AR-B1476. General system information can also be found in this publication.
0.3 BEFORE YOU USE THIS GUIDE
Please refer to the Chapter 3, “Setting Up the System” in this guide, if you have not already installed this AR-
B1476. Check the packing list before you install and make sure the accessories are completely included.
The AR-B1476 diskette provides the newest information regarding the CPU card. Please refer to the
README.DOC file of the enclosed utility diskette. It contains the modification and hardware & software
information, and it has updated to products functions that may not be mentioned here.
0.4 RETURNING YOUR BOARD FOR SERVICE
If your board requires any services, contact the distributor or sales representative 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 for your product by following these guidelines:
1. Include your name, address, telephone, facsimile number and E-mail.
2. A description of the system configuration and/or software at the time is malfunction.
3. A brief description of the problem occurred.
0.5 TECHNICAL SUPPORT AND USER COMMENTS
User’s comments are always welcome as they assist us in improving the quality of our products and the
readability of our publications. They create a very important part of input used for product enhancement and
revision.
We may use and distribute any of the information you provide in any way appropriate without incurring any
obligation. You may, of course, continue to use the information you provide.
If you have any suggestions for improving particular sections or if you find any errors on it, please send your
comments to Acrosser Technology Co., Ltd. or your local sales representative and indicate the manual title and
book number.
Internet electronic mail to: [e-mail]

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0.6 ORGANIZATION
This information for users covers the following topics (see the Table of Contents for a detailed listing):
zChapter 1, “Overview”, provides an overview of the system features and packing list.
zChapter 2, “System Controller” describes the major structure.
zChapter 3, “Setting Up the System”, describes how to adjust the jumper, and the connectors setting.
zChapter 4, “CRT/LCD Flat Panel Display”, describes the configuration and installation procedure using
the LCD and CRT display.
zChapter 5, “Installation”, describes setup procedures including information on the utility diskette.
zChapter 6, “BIOS Console”, providing the BIOS options setting.
zChapter 7, Specifications
zChapter 8, Placement & Dimensions
zChapter 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 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 computer components. Although areas with humid climates are much
less prone to static build-up, it is always best to safeguard against accidents may result in expensive repairs. The
following measures should generally be sufficient to protect your equipment from static discharge:
•Touch a grounded metal object to discharge the static electricity in your body (or ideally, wear a grounded
wrist strap).
•When unpacking and handling the board or other system component, 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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1. OVERVIEW
This chapter provides an overview of your system features and capabilities. The following topics are covered:
zIntroduction
zPacking List
zFeatures
1.1 INTRODUCTION
The AR-B1476 is a half size industrial grade CPU card that has been designed to withstand continuous operation
in harsh environments. The AR-B1476 supports on-board memory 8MB, and extends to 72MB DRAM for using
one 72-pin SIMM.
The 8 layers PCB CPU card is equipped with an IDE HDD interface, a floppy disk drive adapter, 1 parallel port, 2
serial ports and a watchdog timer. Its dimensions are as compact as 122mmX185mm. It highly condensed
features make it an ideal cost/performance solution for high-end commercial and industrial applications where CPU
speeding and mean time between failure is critical.
The AR-B1476 provides 2 bus interfaces, ISA bus and PC/104 compatible expansion bus. Based on the PC/104
expansion bus, you could easy install thousands of PC/104 module from hundreds venders around the world. You
could also directly connect the power supply to the AR-B1476 on-board power connector in standalone
applications.
A watchdog timer has a software programmable time-out interval, is also provided on this CPU card. It ensures
that the system does not hang-up if a program cannot execute normally.
The AR-B1476 is implemented with M1487 and M1489 chipset incorporate a memory controller, parity generation
and checking, two 8237 DMA controllers, two 8259 interrupt controllers, one 8254 timer/counter, an address buffer
and a data buffer.
A super I/O chip (SMC37C669) is embedded in the AR-B1476 card. It combines functions of a floppy disk drive
adapter, a hard disk drive (IDE) adapter, two serial (with 16C550 UART) adapters and 1 parallel adapter. The I/O
port configurations can be done by set the BIOS setup program.
As an UART, the chip supports serial to parallel conversion on data characters received from a peripheral device
or a MODEM, and parallel to serial conversion on data character received from the CPU. The UART includes a
programmable baud rate generator, complete MODEM control capability and a processor interrupt system. As a
parallel port, the SMC37C669 provides the user with a fully bi-directional parallel centronics-type printer interface.

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1.2 PACKING LIST
The accessories are included with the system. Before you begin installing your AR-B1476 board, take a moment
to make sure that the following items have been included inside the AR-B1476 package.
zThis user’s guide
z1 AR-B1476 CPU card
z1 Hard disk drive interface cable
z1 Floppy disk drive interface cable
z1 Parallel port interface cable & 1 RS-232C interface cable mounted on one bracket
z1 Software utility CD.
1.3 FEATURES
The system provides a number of special features that enhance its reliability, ensure its availability, and improve its
expansion capabilities, as well as its hardware structure.
zAll In One designed 486DX/DX2/DX4 CPU card.
zSupports 3.45V/5V CPU with voltage regulator.
zSupports ISA bus and PC/104 bus.
zSupports 512KB cache on board.
zSupports on-board 8MB and extends one 72-pin DRAM SIMM up to 72MB DRAM on board.
zSupports shadow memory and EMS.
zSupports D.O.C. up to 72MB.
zLegal AMI BIOS.
zIDE hard disk drive interface.
zFloppy disk drive interface.
zBi-direction parallel interface.
z2 serial ports with 16C550 UART.
zProgrammable watchdog timer.
zOn-board built-in buzzer.
z8 layers PCB.

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2. SYSTEM CONTROLLER
This chapter describes the major structure of the AR-B1476 CPU board. The following topics are covered:
zDMA Controller
zKeyboard Controller
zInterrupt Controller
zReal-Time Clock and Non-Volatile RAM
zTimer
zSerial Port
zParallel Port
2.1 DMA CONTROLLER
The equivalent of two 8237A DMA controllers are implemented in the AR-B1476 board. Each controller is a four-
channel DMA device that will generate the memory addresses and control signals necessary to transfer
information directly between a peripheral device and memory. This allows high speeding information transfer with less
CPU intervention. The two DMA controllers are internally cascaded to provide 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.
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
2.2 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 placed 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 series 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.

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2.3 INTERRUPT CONTROLLER
The equivalent of two 8259 Programmable Interrupt Controllers (PIC) are included on the AR-B1476 board. They
accept requests from peripherals, resolve priorities on pending interrupts in service, issue interrupt requests to the
CPU, and provide vectors which are used as acceptance indices by the CPU to determine which interrupt service
routine to execute.
Following is the system information of interrupt levels:
IRQ8 : Real time clock
IRQ9 : Rerouting to INT 0Ah from hardware IRQ2
IRQ10 : spare
IRQ11 : spare
IRQ12 : spare (PS/2 mouse)
IRQ13 : Math. coprocessor
IRQ14 : Hard disk adapter
IRQ15 : spare (Watchdog Timer)
InInterrupt Level
NMI
CTRL1
IRQ 0
IRQ 1
IRQ 2
IRQ 3
IRQ 4
IRQ 5
IRQ 6
IRQ 7
CTRL2
Parity check
Description
Serial port 2
Serial port 1
Parallel port 2
Floppy disk adapter
Parallel port 1
System timer interrupt from timer 8254
Keyboard output buffer full
Figure 2-1 Interrupt Controller

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2.3.1 I/O Port Address Map
Hex Range Device
000-01F DMA controller 1
020-021 Interrupt controller 1
022-023 ALI M1489/M1487
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
2.3.2 I/O Channel Pin Assignment (Bus1)
I/O Pin Signal Name Input/Output I/O Pin Signal Name Input/Output
A1 -IOCHCK Input B1 GND Ground
A2 SD7 Input/Output B2 RSTDRV Output
A3 SD6 Input/Output B3 +5V Power
A4 SD5 Input/Output B4 IRQ9 Input
A5 SD4 Input/Output B5 -5V Power
A6 SD3 Input/Output B6 DRQ2 Input
A7 SD2 Input/Output B7 -12V Power
A8 SD1 Input/Output B8 -ZWS Input
A9 SD0 Input/Output B9 +12V Power
A10 -IOCHRDY Input B10 GND Ground
A11 AEN Output B11 -SMEMW Output
A12 SA19 Input/Output B12 -SMEMR Output
A13 SA18 Input/Output B13 -IOW Input/Output
A14 SA17 Input/Output B14 -IOR Input/Output
A15 SA16 Input/Output B15 -DACK3 Output
A16 SA15 Input/Output B16 DRQ3 Input

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I/O Pin Signal Name Input/Output I/O Pin Signal Name Input/Output
A17 SA14 Input/Output B17 -DACK1 Output
A18 SA13 Input/Output B18 DRQ1 Input
A19 SA12 Input/Output B19 -REFRESH Input/Output
A20 SA11 Input/Output B20 BUSCLK Output
A21 SA10 Input/Output B21 IRQ7 Input
A22 SA9 Input/Output B22 IRQ6 Input
A23 SA8 Input/Output B23 IRQ5 Input
A24 SA7 Input/Output B24 IRQ4 Input
A25 SA6 Input/Output B25 IRQ3 Input
A26 SA5 Input/Output B26 -DACK2 Output
A27 SA4 Input/Output B27 TC Output
A28 SA3 Input/Output B28 BALE Output
A29 SA2 Input/Output B29 +5V Power
A30 SA1 Input/Output B30 OSC Output
A31 SA0 Input/Output B31 GND Ground
Table 2-3 I/O Channel Pin Assignments
I/O Pin Signal Name Input/Output I/O Pin Signal Name Input/Output
C1 -SBHE Input/Output D1 -MEMCS16 Input
C2 LA23 Input/Output D2 -IOCS16 Input
C3 LA22 Input/Output D3 IRQ10 Input
C4 LA21 Input/Output D4 IRQ11 Input
C5 LA20 Input/Output D5 IRQ12 Input
C6 LA19 Input/Output D6 IRQ15 Input
C7 LA18 Input/Output D7 IRQ14 Input
C8 LA17 Input/Output D8 -DACK0 Output
C9 -MRD16 Input/Output D9 DRQ0 Input
C10 -MWR16 Input/Output D10 -DACK5 Output
C11 SD8 Input/Output D11 DRQ5 Input
C12 SD9 Input/Output D12 -DACK6 Output
C13 SD10 Input/Output D13 DRQ6 Input
C14 SD11 Input/Output D14 -DACK7 Output
C15 SD12 Input/Output D15 DRQ7 Input
C16 SD13 Input/Output D16 +5V Power
C17 SD14 Input/Output D17 -MASTER Input
C18 SD15 Input/Output D18 GND Ground
Table 2-4 I/O Channel Pin Assignments

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2.4 REAL-TIME CLOCK AND NON-VOLATILE RAM
The AR-B1476 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 very little power and can be
maintained for long period of time using an internal Lithium battery. The contents of each byte in the CMOS RAM
are listed as follows:
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 2-5 Real-Time Clock & Non-Volatile RAM
2.5 TIMER
The AR-B1476 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 speaker tone.
Application programs can load different counts into this timer to generate various sound frequencies.

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2.6 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 receiver 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 handle the communications link.
The following table is 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 2-6 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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(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)

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(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
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
Table 2-7 Serial Port Divisor Latch
2.7 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 2-8 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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(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 as follows:
XXX
12345670
-ERROR
SLCT
PE
-ACK
-BUSY
Figure 2-2 Printer Status Buffer
NOTE: X presents not used.
Bit 7: This signal may become active during data entry, when the printer is off-line during printing, or when the
print head is changing position or in an error state. When Bit 7 is active, the printer is busy and cannot
accept data.
Bit 6: This bit represents the current state of the printer’s ACK signal. A0 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 BUSY message stops.
Bit 5: A1 means the printer has detected the end of the paper.
Bit 4: A1 means the printer is selected.
Bit 3: A0 means the printer has encountered an error condition.

AR-B1476 User’s Guide
2-10
(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
12345670
STROBE
AUTO FD XT
INIT
SLDC IN
IRQ ENABLE
DIR(write only)
Figure 2-3 Bit’s Definition
NOTE: X presents 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 writing only.
Bit 4: A1 in this position allows an interrupt to occur when ACK changes from low state to high state.
Bit 3: A1 in this bit position selects the printer.
Bit 2: A0 starts the printer (50 microseconds pulse, minimum).
Bit 1: A1 causes the printer to line-feed after a line is printed.
Bit 0: A0.5 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.

AR-B1476 User’s Guide
3-1
3. SETTING UP THE SYSTEM
This section describes pin assignments for system’s external connectors and the jumpers setting.
zOverview
zSystem Setting
3.1 OVERVIEW
The AR-B1476 is a half size industrial grade CPU card that has been designed to withstand continuous operation
in harsh environments. This section provides hardware’s jumpers setting, the connectors’ locations, and the pin
assignment.
Figure 3-1 External System Location

AR-B1476 User’s Guide
3-2
3.2 SYSTEM SETTING
Jumper pins allow you to set specific system parameters. Set them by changing the pin location of jumper blocks.
(A jumper block is a small plastic-encased conductor [shorting plug] that slips over the pins.) To change a jumper
setting, remove the jumper from its current location with your fingers or small needle-nosed pliers. Place the
jumper over the two pins designated for the desired setting. Press the jumper evenly onto the pins. Be careful not
to bend the pins.
We will show the locations of the AR-B1476 jumper pins, and the factory-default setting.
CAUTION: Do not touch any electronic component unless you are safely grounded. Wear a grounded wrist strap
or touch an exposed metal part of the system unit chassis. The static discharges from your fingers can
permanently damage electronic components.
3.2.1 Hard Disk (IDE) Connector (CN1)
A 40-pin header type connector (CN1) is provided to interface with up to two embedded hard disk drives (IDE AT
bus). This interface, through a 40-pin cable, allows the user to connect up to two drives in a “daisy chain” fashion.
To enable or disable the hard disk controller, please use the BIOS Setup program. The following table illustrates
the pin assignments of the hard disk drive’s 40-pin connector.
1
2
Figure 3-2 CN1: Hard Disk (IDE) Connector
Pin Signal Pin Signal
1 -RESET 2 GROUND
3 DATA 7 4 DATA 8
5 DATA 6 6 DATA 9
7 DATA 5 8 DATA 10
9 DATA 4 10 DATA 11
11 DATA 3 12 DATA 12
13 DATA 2 14 DATA 13
15 DATA 1 16 DATA 14
17 DATA 0 18 DATA 15
19 GROUND 20 NOT USED
21 NC 22 GROUND
23 -IOW A 24 GROUND
25 -IOR A 26 GROUND
27 -CHRDY A 28 NOT USED
29 NC 30 GROUND
31 -IRQ A 32 -IO16
33 SA 1 34 NOT USED
35 SA 0 36 SA 2
37 CS 0 38 CS 1
39 HD LED A 40 GROUND
Table 3-1 HDD Pin Assignment