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Octek HAWK 486 Manual

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  • Page 1 H A W K 4 8 6...
  • Page 2 The material in this manual is for information only and is subject to change without notice. REVISION: 1.0 IBM, IBM PC/XT/AT, PC-DOS, MS-DOS, OS/2, INTEL, WEITEK, PHOENIX ARE THE TRADEMARKS OR REGISTERED TRADEMARKS OF THEIR RESPECTIVE OWNERS.
  • Page 3 RADIO FREQUENCY INTERFERENCE STATEMENT This equipment generates and uses radio frequency energy and if not installed and used properly, that is, in strict accordance with the manufacturer's instructions, may cause interference with radio and television reception. If this equipment does cause interference to radio or TV reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:...
  • Page 4 Note Electronic components are sensitive to dust and dirt. Do inspect and clean the computer system regularly. Turn off the power whenever you install or remove any connector, memory module and add-on card. Before turning on the power, make sure that all the connectors, memory modules and add-on cards are secured.
  • Page 5 In this manual, there are 4 chapters. Chapter 1 contains a brief introduction and specification of OCTEK HAWK-486 motherboard. In the Chapter 2, the functions of OCTEK HAWK-486 are explained. It also outlines many advanced features of the CPU and the system architecture.

  • Page 6: Table Of Contents

    CONTENT Chapter 1 INTRODUCTION Chapter 2 GENERAL FEATURES Specification Processor Memory System Dual Bus Design System Functions 2-10 Chapter 3 INSTALLING COMPONENTS Installing RAM Modules Installing External Battery Configuration of Memory DRAM Configuration Control of System Speed Reset CMOS Setup Information System Board Jumper Setting System Board Connectors...
  • Page 7 Chapter 4 TECHNICAL INFORMATION Memory Mapping I/O Address Map System Timers System Interrupts Direct Memory Access (DMA) Real Time Clock and CMOS CMOS RAM Address Map Real Time Clock Information 4-10 System Expansion Bus 4-11 APPENDIX A SYSTEM BIOS Setup Utility Description Prompt-Line Prompts Esoteric Prompts Setup Section...
  • Page 8 APPENDIX C TROUBLESHOOTING Main Memory Error Improper Setting of Wait State APPENDIX D SYSTEM BOARD LAYOUT...

  • Page 9: Chapter 1 Introduction

    Chapter 1 Introduction _______________________________ OCTEK HAWK-486 consists of 32-bit 80486 microprocessor, a large cache memory and highly integrated chipsets to provide high performance, reliability and compatibility. OCTEK HAWK-486 is a perfect choice for CAD/CAM workstation and file server and supports sophisticated 32-bit computing applications and multi-user operating systems.
  • Page 10 INTRODUCTION __________________________________ THIS PAGE IS INTENTIONALLY LEFT BLANK...

  • Page 11: General Features

    Chapter 2 General Features _______________________________ SPECIFICATION Processor : Intel 80486DX, 80486SX and 80487SX CPU Speed : Turbo/normal speed Software/hardware selectable I/O Slot : Compatible to standard AT bus Two 8-bit and six 16-bit slots Programmable wait state for AT cycle Programmable AT Bus speed Memory : Shadow RAM for System BIOS and Video BIOS...
  • Page 12 GENERAL FEATURES __________________________________ System Support Functions : 8-Channel DMA (Direct Memory Access) 16-level interrupt 3 programmable timers CMOS RAM for system configuration Real time clock with battery backup Other Features : On board POWERGOOD generation On board battery backup CMOS data External battery connector Hardware / Software turbo switch...

  • Page 13: Processor

    It is fully binary compatible with 80386 and 80387. All existing software for PC XT/AT can be used on OCTEK HAWK-486. However, due to the new internal architecture, the performance of 80486 is two to four times of 80386.
  • Page 14 GENERAL FEATURES __________________________________...
  • Page 15 GENERAL FEATURES __________________________________ The cache memory is a 8K bytes, 16 bytes line size, four-way set associative configuration. The hit rate of this configuration is much better than 32K bytes two-way set associative external cache because a four-way set associative architecture provides better performance in a multitasking and multi-processor environment.
  • Page 16 GENERAL FEATURES __________________________________ By eliminating the access to external bus, operations with the internal cache can be completed in a single cycle. 80386 at least needs two cycles for an operation. To further increase the rate of data transfer inside the CPU, the internal bus of the cache memory is increased to 128 bits, which is four times of the external bus.
  • Page 17 GENERAL FEATURES __________________________________ Internal memory management unit provides a flexible addressing scheme for the next generation operation system. Multitasking, concurrent operation and manipulating huge data base can be accomplished with excellent performance. Paging mechanism is employed to allow powerful operating system to implement virtual memory.

  • Page 18: Memory System

    GENERAL FEATURES __________________________________ MEMORY SYSTEM Two banks of DRAMs can be installed on motherboard and 256K, 1MB and 4MB DRAM SIMM modules are support. One bank of DRAM refers to four pieces of SIMM modules. The maximum memory size is 32MB when using 4MB DRAM for all banks. The DRAM should be fast-page mode DRAM with CAS# before RAS# refresh capability.

  • Page 19: Dual Bus Design

    GENERAL FEATURES __________________________________ DUAL BUS DESIGN It is very important that a high speed system should be compatible with existing peripherals without lowering the performance. To be compatible, the I/O slot should run at 8MHz or slower. On the other hand, the rest of the system are running at full speed. A dual bus design is employed.
  • Page 20 GENERAL FEATURES __________________________________ │ └───┬───┘ └───────┘ │ │ ┌──┴───┐ ┌───┴───┐ │ │ │ │ │ │ │ │ └──────┘ └───────┘ 2-10...

  • Page 21: System Functions

    - I/O channel control All system functions are 100% compatible to AT standard. I/O channel of OCTEK HAWK-486 is designed to be compatible with standard AT bus. All the expansion cards conformed to the standard AT bus can be used in OCTEK HAWK-486 without problem.

  • Page 23: Installing Components

    Important Note : Turn off the power before installing or replacing any component. INSTALLING RAM MODULES OCTEK HAWK-486 has eight sockets for SIMM modules. Whenever adding memory modules to the motherboard, install four modules at the same time. Also make sure that the chips on the modules face toward the memory expansion slot as shown in the next page.
  • Page 24 INSTALLING COMPONENTS __________________________________ If the BIOS reports an memory error or parity error, drag out the modules and insert them again. If the locking latches are damaged, contact your dealer to replace the socket. Installing RAM Modules...

  • Page 25: Installing External Battery

    INSTALLING COMPONENTS __________________________________ INSTALLING EXTERNAL BATTERY To back up the information stored in CMOS RAM, an external battery is needed to provide power after the system is turned off. The connector (P8) for the battery is located beside the keyboard connector on the rear of the board.

  • Page 26: Configuration Of Memory

    INSTALLING COMPONENTS __________________________________ CONFIGURATION OF MEMORY The configuration of the memory is very flexible. It can install 256KB , 1MB or 4MB SIMM modules are acceptable. There are several combinations of DRAM types you may consider. So, a basic system can be equipped with fewer memory and the system can be upgraded by installing the extended memory.

  • Page 27: Dram Configuration

    INSTALLING COMPONENTS __________________________________ The number of wait state is assigned in the BIOS setup. Improper setting may cause the system malfunction. In this case, reset the CMOS setup using JP3. Then reset the system and go through the system setup again. DRAM CONFIGURATION Bank 0 SIMM Bank 1 SIMM...

  • Page 28: Control Of System Speed

    INSTALLING COMPONENTS __________________________________ CONTROL OF SYSTEM SPEED System speed can be controlled by hardware switch and keyboard. Connector P4 is connected to the turbo switch of the case. When the system speed is fast, the turbo LED of the case should be turned on.

  • Page 29: System Board Jumper Setting

    INSTALLING COMPONENTS __________________________________ SYSTEM BOARD JUMPER SETTING There are several options which allow user to select by hardware switches. Security Selection Enable OPEN Disable * CPU Type 486DX 486SX 487SX * 1-2 OPEN * 1-2 OPEN * 1-2 Note : * factory setting...

  • Page 30: System Board Connectors

    INSTALLING COMPONENTS __________________________________ SYSTEM BOARD CONNECTORS Under typical conditions, these connectors should be connected to the indicators and switches of the system unit. Connector Function Hardware reset connector Speaker connector Turbo switch connector Turbo LED connector Power LED & Ext-Lock connector P6, P7 Power supply connector External battery connector...
  • Page 31 INSTALLING COMPONENTS __________________________________ P 5 - Speaker Connector Assignment Data out +5 Vdc Ground +5 Vdc P 4 - Turbo Switch Connector Assignment Selection Pin Ground P 3 - Turbo LED Connector Assignment +5 Vdc LED signal...
  • Page 32 INSTALLING COMPONENTS __________________________________ P 1 - Power LED & Ext-Lock Connector Assignment +5 Vdc Ground Keyboard inhibit Ground P6, P7 - Power Supply Connector Assignment POWERGOOD +5 Vdc +12 Vdc -12 Vdc Ground Ground Assignment Ground Ground -5 Vdc +5 Vdc +5 Vdc +5 Vdc 3-10...
  • Page 33 INSTALLING COMPONENTS __________________________________ P 8 - External Battery Connector Assignment + Vdc not used Ground Ground KB 1 - Keyboard Connector Assignment Keyboard clock Keyboard data Spare Ground +5 Vdc 3-11...
  • Page 34 INSTALLING COMPONENTS __________________________________ THIS PAGE IS INTENTIONALLY LEFT BLANK 3-12...

  • Page 35: Technical Information

    Chapter 4 Technical Information _______________________________ This section provides technical information about OCTEK HAWK-486 and is intended for advanced users interested in the basic design and operation of OCTEK HAWK-486. MEMORY MAPPING Address Range Function 000000- 000K-512K System Board Memory 7FFFFF...

  • Page 36: I/O Address Map

    TECHNICAL INFORMATION __________________________________ I/O ADDRESS MAP I/O Address Map on System Board I/O address hex 000 to 0FF are reserved for the system board I/O. ADDRESS DEVICE (HEX) 000-01F DMA Controller 1, 8237 020-03F Interrupt Controller 1, 8259, Master 040-05F Timer, 8254 060-06F Keyboard Controller...
  • Page 37 TECHNICAL INFORMATION __________________________________ I/O address hex 100 to 3FF are available on the I/O channel. ADDRESS DEVICE (HEX) 1F0-1F8 Fixed Disk 200-207 Game I/O 278-27F Parallel Printer Port 2 2F8-2FF Serial Port 2 300-31F Prototype Card 360-36F Reserved 378-37F Parallel Printer Port 1 380-38F SDLC, bisynchronous 2 3A0-3AF...

  • Page 38: System Timers

    TECHNICAL INFORMATION __________________________________ SYSTEM TIMERS OCTEK HAWK-486 has three programmable timer/counters controlled by 82C206 and they are defined as channels 0 through 2 : Channel 0 System Timer Gate 0 Tied on Clk in 0 1.190 Mhz OSC Clk out 0...
  • Page 39 TECHNICAL INFORMATION __________________________________ Channel 2 Tone Generation of Speaker Gate 2 Controlled by bit 0 of port hex 61 PPI bit Clk in 2 1.190 Mhz OSC Clk out 2 Used to drive the speaker Note :Channel 1 is programmed to generate a 15-micro-second period signal. The 8254 Timer/Counters are treated by system programs as an arrangement of four programmable external I/O ports.

  • Page 40: System Interrupts

    TECHNICAL INFORMATION __________________________________ SYSTEM INTERRUPTS Sixteen levels of system interrupts are provided OCTEK HAWK-486. The following shows the interrupt-level assignments in decreasing priority. ┌──────────────────────────────────────┐ Level Function Microprocessor NMI Parity or I/O Channel Check Interrupt Controllers CTLR 1 CTLR 2 IRQ0...
  • Page 41 TECHNICAL INFORMATION __________________________________ ╞══════════════════════════════════════╡ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ─┐ │ │ │ ┌─ │ │ │ │ │ │ │ │ │ │ │ │ │ │ └─┤ │ │...

  • Page 42: Direct Memory Access (Dma)

    TECHNICAL INFORMATION __________________________________ DIRECT MEMORY ACCESS (DMA) OCTEK HAWK-486 supports seven DMA channels. Channel Function Spare (8 bit transfer) SDLC (8 bit transfer) Floppy Disk (8 bit transfer) Spare (8 bit transfer) Cascade for DMA Controller 1 Spare (16 bit transfer)

  • Page 43: Real Time Clock And Cmos

    TECHNICAL INFORMATION __________________________________ The following shows the addresses for the page register. Page Register I/O Address (HEX) DMA Channel 0 0087 DMA Channel 1 0083 DMA Channel 2 0081 DMA Channel 3 0082 DMA Channel 5 008B DMA Channel 6 0089 DMA Channel 7 008A...

  • Page 44: Cmos Ram Address Map

    TECHNICAL INFORMATION __________________________________ CMOS RAM ADDRESS MAP Addresses Description 00-0D * Real-time clock information * Diagnostic status byte * Shutdown status byte Diskette drive type byte - drives A and B Reserved Fixed disk type byte - drives C and D Reserved Equipment byte Low base memory byte...

  • Page 45: Real Time Clock Information

    TECHNICAL INFORMATION __________________________________ REAL TIME CLOCK INFORMATION The following table describes real-time clock bytes and specifies their addresses. Byte Function Address Seconds Second alarm Minutes Minute alarm Hours Hour alarm Day of week Date of month Month Year Status Register A Status Register B Status Register C Status Register D...

  • Page 46: System Expansion Bus

    TECHNICAL INFORMATION __________________________________ SYSTEM EXPANSION BUS OCTEK HAWK-486 provides seven 16-bit slots. The I/O channel supports: I/O address space from hex 100 to hex 3FF Selection of data access (either 8 or 16 bit) 24 bit memory addresses (16MB) Interrupts...
  • Page 47 TECHNICAL INFORMATION __________________________________ The following figure shows the pin numbering for I/O channel connectors JA1 to JA7. 4-13...
  • Page 48 TECHNICAL INFORMATION __________________________________ The following figure shows the pin numbering for I/O channel connectors JB1-JB7. 4-14...
  • Page 49 TECHNICAL INFORMATION __________________________________ The following tables summarize pin assignments for the I/O channel connectors. I/O Channel (A-Side) I/O Pin Signal Name -I/O CH CK -I/O CH RDY SA19 SA18 SA17 SA16 SA15 SA14 SA13 SA12 SA11 SA10 4-15...
  • Page 50 TECHNICAL INFORMATION __________________________________ I/O Channel (B-Side) I/O Pin Signal Name Ground RESET DRV +5 Vdc Power IRQ9 -5 Vdc Power DRQ2 -12 Vdc Power +12 Vdc Power Ground -SMEMW -SMEMR -IOW -IOR -DACK3 DRQ3 -DACK1 DRQ1 -Refresh IRQ7 IRQ6 IRQ5 IRQ4 IRQ3 -DACK2...
  • Page 51 TECHNICAL INFORMATION __________________________________ I/O Channel (C-Side) I/O Pin Signal Name SBHE LA23 LA22 LA21 LA20 LA19 LA18 LA17 -MEMR -MEMW SD10 SD11 SD12 SD13 SD14 SD15 4-17...
  • Page 52 TECHNICAL INFORMATION __________________________________ I/O Channel (D-Side) I/O Pin Signal Name -MEM CS16 -I/O CS16 IRQ10 IRQ11 IRQ12 IRQ15 IRQ14 -DACK0 DRQ0 -DACK5 DRQ5 -DACK6 DRQ6 -DACK7 DRQ7 +5 Vdc Power -MASTER Ground 4-18...
  • Page 53 TECHNICAL INFORMATION __________________________________ THIS PAGE IS INTENTIONALLY LEFT BLANK 4-19...

  • Page 55: Appendix Asystem Bios

    Appendix A System BIOS _______________________________ The system BIOS provides an interface for the software to control the hardware and is recorded in a ROM (Read Only Memory) chip. Upon power-up, it will also carry out a thorough diagnostic test to make sure the system is functional.

  • Page 56: Setup Utility Description

    SYSTEM BIOS __________________________________ SETUP UTILITY DESCRIPTION A Setup Utility is incorporated into the BIOS which allows the user to change the system configuration, and to select a variety of options. You may enter the Setup Utility in three ways: (1)A configuration change detected, or (2)ESC is pressed during cold-boot, or (3)CTRL+ALT+ESC is pressed to warm-boot into Setup.
  • Page 57 SYSTEM BIOS __________________________________ The main screen format of setup utility consists of these four fields: Copyright/Version On the top two lines on the screen, the BIOS version number is shown. Menu Line A list of setup section names appears on this line, from which a specific section may be selected.
  • Page 58 SYSTEM BIOS __________________________________ The main Setup Menu is shown as below when the Setup Utility is invoked. MR BIOS (tm) Copyright (c) 1991, Microid Research Ver 1.26 Port OPTI435 Summary Clock Video Floppy Fixed Boot-Seq Keyboard More--> CPU Type ......80486DX Floppy 0 ......
  • Page 59 SYSTEM BIOS __________________________________ PROMPT-LINE TEXT The purpose of this section is to further explain the meanings of the keystroke prompts. They are somewhat abbreviated due to screen space limitations. F10 TO RECORD AND EXIT Press F10 to record the new configuration to CMOS, and terminate the Setup session.
  • Page 60 SYSTEM BIOS __________________________________ ESC FOR MENU When the cursor is currently in the Edit-Page, press ESC (or PgUp) to return to Menu-Line. (UP/DOWN/LEFT/RIGHT ARROWS) MOVES CURSOR The cursor is currently illuminating a field within an Edit-Page. It may be moved to another field via these cursor keys. (ENTER) TO EDIT The cursor is currently illuminating a field within Edit-Page.
  • Page 61 SYSTEM BIOS __________________________________ +-SCROLLS CHOICES SPACEBAR +- TO CHANGE SPACEBAR +- SCROLLS CHOICES The cursor is currently illuminating a field within the Edit-Page which may be changed. Press SpaceBar or "+" to change to other available options. The options are rolled through a list in the forward direction.

  • Page 62: Esoteric Prompts

    SYSTEM BIOS __________________________________ ESOTERIC PROMPTS A few special-case prompts also exist. Generally, they specify a range of numbers or a particular set of AlphaNumeric characters that will be accepted in the field. For example, the CLOCK Time-Of-Day subfield accepts Alphabetic "a" and "p" to indicate am and pm. The SECURITY utility requires pressing ENTER after selecting a new configuration.

  • Page 63: Setup Section

    SYSTEM BIOS __________________________________ SETUP SECTION There are currently 13 sections contained in BIOS Setup. As the cursor is moved across the Menu Line, Page for the respective Setup Section appears in the Edit. A quick summary of the utilities is given below.

  • Page 64: Math Unit

    SYSTEM BIOS __________________________________ MATH UNIT Numeric-Coprocessor-Extension type found in the system. Description Built-in internal cache RAM CACHE It indicates status of internal cache. RAM CACHE Disable disable internal cache Enable enable internal cache SHADOW RAM Indicates if any part of the (384K) ROM space is mapped to shadow RAM.

  • Page 65: Memory-Base

    SYSTEM BIOS __________________________________ MEMORY-BASE Indicates the amount of base memory (below 1 Megabyte boundary). Possible range is 64K to 640K. MEMORY-EXTENDED Indicates the amount of extended memory (above 1 Megabyte boundary). Possible range is 0K to 15360K. For example, Memory-Extended ..1024K MEMORY-SYSTEM Indicates the amount of special OEM memory found to be in working order.

  • Page 66: Com1

    SYSTEM BIOS __________________________________ COM1, COM2, COM3, COM4 Indicates if RS232 serial port COM1 is present, and its I/O address. For example, COM1 ..n/a COM1 ..3F8 COM1 ..2F8 LPT1, LPT2, LPT3 and LPT4 Indicates if parallel (printer) port LPT1 is present, and its I/O address.

  • Page 67: Fixed 80 (C:)

    SYSTEM BIOS __________________________________ FIXED 80 (C:), FIXED 81 (D:) Indicates fixed disk type, step rate encoding and if "Translation Mode" is in effect. If the "Translation Mode" is enabled for this disk a letter "T" will be shown. the step rate will be shown if set to non-zero. Fixed 80 (C:) Description Fixed controller card not present...

  • Page 68: Anti-Virus

    SYSTEM BIOS __________________________________ ANTI-VIRUS The Anti-Virus is provided in two options: enable disable SECURITY The state of password-Security is shown in this field. For example, Security ..Enable Security ..Disable KEYBOARD The keyboard type is shown in this field. Eg, Keyboard ...

  • Page 69: Numlock

    SYSTEM BIOS __________________________________ NUMLOCK The programmable powerup NumLock state is shown in this field. Note: This is only meaningful for AT-type keyboards. For example, NumLock ..Off NumLock ..On TYPEMATIC The programmable powerup "typematic" repeat rate is shown here. Note: This is only meaningful for AT-type keyboards.

  • Page 70: Video-Primary

    SYSTEM BIOS __________________________________ VIDEO-PRIMARY Indicates the video adaptor which will be in use when the system boots. Video-Primary Description None Special Support, see VIDEO menu Monochrome B/W card CGA - Snow CGA, slow access due to "snow" CGA - Fast CGA, "snow"...
  • Page 71 SYSTEM BIOS __________________________________ CLOCK CONFIGURATION The battery backed Real-Time-Clock (RTC) time, date, and daylight savings feature are programmed through this utility. TIME The time field is shown in 12 hour format, followed by a time-of-day indicator "a" or "p" (am/pm). Enter the time directly. After entering the second, the cursor moves the right most of the field, press `a' for am or`p' for pm.
  • Page 72 SYSTEM BIOS __________________________________ DAYLIGHT SAVINGS The RTC has a built-in capability to automatically adjust the time on the two daylight savings days of the year. If enable, on the last Sunday in April, the time increments from 1:59:59 am to 3:00:00 am. On the last Sunday in October, when the time reaches 1:59:59 am, it is rolled-back to 1:00:00 am.
  • Page 73 SYSTEM BIOS __________________________________ VIDEO CONFIGURATION The primary video adaptor is declared through this utility. A "primary" adaptor is defined to be the video card which will be recognized by the operation system. If there are two video cards present, the other one becomes the "secondary" video adaptor. The secondary adaptor is placed into a standby state and can only be activated by specialized software.
  • Page 74 SYSTEM BIOS __________________________________ FLOPPY DISK CONFIGURATION This utility setups the floppy drive subsystem, drives A:, B:, C: and D:. The BIOS supports the following types of floppy disk drives: 5.25 inch, 360K bytes drive; 5.25 inch, 1.2M bytes drive; 3.5 inch, 720k bytes drive; 3.5 inch, 1.4M bytes drive;...
  • Page 75 SYSTEM BIOS __________________________________ (5)FIXED DISK CONFIGURATION / LOW LEVEL FORMAT This utility configures the fixed disk subsystem, drives C: and The type of fixed disks may be selected from standard fixed disk table or defined as user-defined type 46 and 47. The drive parameter tables are comprised of these entries: Number of Cylinders Number of Heads...
  • Page 76 SYSTEM BIOS __________________________________ To support the translate mode, a Low-level-Format utility is supported by the BIOS. Press CTRL-F to enter Low-level Format utility. Enter the range of cylinders to be formatted. The sequence may be increasing or decreasing order. If the final cylinder is greater than the start cylinder, it is in increasing order.
  • Page 77 SYSTEM BIOS __________________________________ (6)BOOT SEQUENCE CONFIGURATION BOOT SEQUENCE In a typical BIOS implementation, whenever CTRL ALT DEL is pressed or cold-boot, an attempt to boot from drive A: always occurs first. If the drive is found to be empty, drive C: is booted. However, hard disk is always used as the boot device in the computer system, and drive A: is only used to transfer files.
  • Page 78 SYSTEM BIOS __________________________________ MEMORY PRIMING Memory test will be carried out after cold-boot. When there is a lot of memory installed, the test will take some time. To speed up the test, you may change from "Full test" to "Quick scan". The BIOS will only perform a simple memory test which will just need a few seconds.
  • Page 79 SYSTEM BIOS __________________________________ KEYBOARD CONFIGURATION NUMLOCK 84-key AT-style keyboards, lacks a dedicated cursor-control keypad. The NumLock control key is used on these keyboards to toggle the Numeric Keypad from numeric operation to cursor functions. In the original AT system, Numlock is always on after booting and thus the keypad is in numeric mode.
  • Page 80 SYSTEM BIOS __________________________________ Repeat Rate of 30.0 cps. If the keyboard fails to function properly when overriding the default typematic state, disable the "Typematic Override" field. The Delay and Rate fields will display "Default" in response to this selection. In this way, no typematic parameters will be issued to the keyboard. A-26...
  • Page 81 SYSTEM BIOS __________________________________ FIRST AID The setup utility "First Aid" provides some measures to solve many problems in AT design. The first one is the keyboard problem with Novell environment in high speed system. keyboard may not be respond very well because Novell program is running at very fast speed but the keyboard is a slow speed device.
  • Page 82 SYSTEM BIOS __________________________________ CACHE CONFIGURATION You can enable the internal cache of CPU and no external secondary cache supported in this system. The internal cache is by default enabled. A-28...
  • Page 83 SYSTEM BIOS __________________________________ (10)SHADOW RAM CONFIGURATION In this section, the BIOS allows you to select "shadow RAM" function for the address in 640K to 1M region. The BIOS will detect which address is occupied by adapter ROM and video ROM. The address range of C0000H to CFFFFH, which is usually used by VGA and EGA BIOS, is divided into four 16K blocks.
  • Page 84 SYSTEM BIOS __________________________________ ranges and hence there are more spaces available in the 640KB range. If a particular memory block in D0000H to DFFFFH and E0000H to EFFFFH are set to "RW-Shadow", 256KB remapped function is not enabled. A-30...
  • Page 85 SYSTEM BIOS __________________________________ (11) DMA PARAMETER DMA timings may be adjusted to adapt to your EtherNet, SCSI and other Bus-Master peripherals, to achieve optimal performance. However care should be taken when setting these parameters so that it won't violate the specification. The default values are recommended for reliable operation.
  • Page 86 SYSTEM BIOS __________________________________ MEMR# SIGNAL / MEMW# SIGNAL Setting to the option "Normal" is compatible to standard AT design. The option "Early" allows the faster generation of control signal MEMR# and MEMW#. Since it is reliable to use the option "Normal", it is rarely necessary to choose the other one.
  • Page 87 SYSTEM BIOS __________________________________ (12) CHIPSET This section provides a means to define some parameters for the system, such as memory wait state and the AT-bus speed. The default settings are proper for normal usage. Changing the setting may lead to better performance, but make sure your system is still reliable and compatible with the peripherals.
  • Page 88 SYSTEM BIOS __________________________________ AT BUS CLOCK Bus clock is used by pripherals on the motherboard and slot, such display and DMA Bus clock is generated from CPU clock-in and the speed of Bus clock is shown below. CPU Speed (MHz) AT CLK CLKIN/4 * 8.4...
  • Page 89 SYSTEM BIOS __________________________________ (13) SECURITY CONFIGURATION This utility is used to enable or disable Password Security. In order to use this feature, place a jumper on JP2. This Security feature offers a measure of protection against unauthorized use of the computer, by requiring a password when the computer is first being powered up.
  • Page 90 SYSTEM BIOS __________________________________ Once the password has been defined, it may subsequently be changed using this utility. To accomplish this, toggle the "Security" field entry from "Enable" to "Change Code", and press ENTER. procedure is identical to initially installing the password. The password entry feature may also be set to "Disable"...
  • Page 91 SYSTEM BIOS __________________________________ THIS PAGE IS INTENTIONALLY LEFT BLANK A-37...
  • Page 93 Appendix B Operation and Maintenance _______________________________ STATIC ELECTRICITY When installing or removing any add-on card, DRAM module or coprocessor, you should discharge the static electricity on your body. Static electricity is dangerous to electronic device and can build-up on your body. When you touch the add-on card or motherboard, it is likely to damage the device.
  • Page 94 OPERATION AND MAINTENANCE __________________________________ CLEANING THE "GOLDEN FINGER" Whenever inserting an add-on card to the motherboard, make sure that there is no dirt on the "golden finger" of the add-on card. If not, the contact between the "golden finger" and the slot may be poor and thus the add-on card may not work properly.
  • Page 95 Appendix C Troubleshooting _______________________________ MAIN MEMORY ERROR After power up, the monitor remains blank, and there are beep sounds indicating a main memory failure. In this case, turn off the power and remove all SIMM modules. Carefully place the modules back to the sockets and make sure that all the modules are locked by the locking latches firmly.
  • Page 96 TROUBLESHOOTING __________________________________ THIS PAGE IS INTENTIONALLY LEFT BLANK...
  • Page 97 Appendix D System Board Layout _______________________________...

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