MICRO COMPUTER SPECIALISTS, INC.
Contents
1. r SANS ode Section 2 System Description Processor AG D AA System Memory DRAM nn 32 222820 AA AN AAA SAS Aan las aa DMA Controller Clock Calendar and COM OS RAM s ts Ess Keyboard POr e E TE Mous amp Bolt N aa di Speaker POr E NEE g karene kos Reset Switch menanda Tani AN AAA Dana a dann Lian A AAA Tedi Pinter A AN AAA AAA GA AAA ASAL AA ai Serial Ports mois da a Bares Floppy Disk Port aaa een An BS La nn AB ine Enhanced IDE Hard Disk 01 Optional PROMDISK Chip Disk 01 SVGA Display Porter ses ANA Bean an RR d nie a Wateh Dog Times nn anne ea daa Section 3 Setup Section 4 Using the PROMDISK Chip Disk Emulator Using ROM DOS and Other Disk Operating 5 8 5 PROMDISK L w Level Formatii nei rea Section 5 Installation Installing the SIMMS tt di es Installing the CPU AA Alana an na ieinn oh Installing the PROMDISK Chi pes nn nn lahan nun lana nan ann nana naco redondos Completing the Installation Ss ann en A adan2. Pin Signal Pin Signal 5 ipene 6 7 IDEDS 8 IDEDIO 9 IDED4 10 IDEDI1 14 CND Printer Interface Connector Pin Signal Pin Signal 6 PDAT4 19 anD 8 PDAT6 21 GND 9 PDAT7 22 GND CN10 Serial Port 1 9 pin Sub D Connector Pin Signal Name 6 DATASETREADYH 8 CLEARTOSEND 1 9 RINGINDICATOR 1 CN6 Serial Port 2 10 pin Header Connector Pin Signal Name 7 6 CLEARTOSEND 2 8 RINGINDICATOR 2 9 i O CN11 Keyboard Connector PS2 type Pin Signal 6 Inc CN12 Reset Header Connector 16 1 RESET Connect to switch ground this pin to reset CN2 Speaker Port Header Connector Pin Signal Name Description 2 ne es CN3 IDE LED Header Connector Pin Signal Name 5VDC Connect to IDE LED anode IDE LED Connect to IDE LED cathode CN9 PS2 Mouse Connector Pin Signal 6 wo CN13 Auxiliary Power Connector Pin Signal Name CN15 Keylock Header Connector Pin Signal Name LED POWER 4 Connect to anode of power LED N C Ke N C Ke Connect to cathode of power LED KBLOCK Connect to ground to inhibit keyboard APPENDIX E CONFIGURATION JUMPERS JP14 CPU Power Selection Jumper 3 45VDC JP2 10 CPU Selection Jumpers Cyrix TI SGS DX2 DX4 486DX DX2 DX4 AMD DX2 SV8B 5 6 JP11 AMD DX4 SV8B Cache Control
3. Jumper JP13 JP15 amp JP16 CPU Clock Speed Selection Jumpers CPU Clock Note DX2 DX4 100 amp 5x86 100 use 33MHz CPU Clock DX2 80 DX4 120 amp 5x86 120 use 40MHz CPU clock AMD 5x86 133 use 33MHz CPU clock JP18 PS 2 Mouse Enable Jumper JP19 WatchDog Timer Control Jumper Generates NMI IOCHRDY when time out occurs JP17 WatchDog Timer Time out Period Jumper Time 12 34 56 78 JP20 PROMDISK Chip Address Selection Jumper Special Do Not Use APPENDIX F BIOS ERROR BEEP CODES During the POST Power On Self Test routines which are performed each time the system is powered on errors may occur Nonfatal errors are those which in most cases allow the system to continue the boot up process The error messages normally appear on the screen Fatal errors are those which will not allow the system to continue the boot up procedure If a fatal error occurs you should consult with MCSI Customer Service for possible repairs These fatal errors are communicated through a series of audible beeps The numbers on the fatal error list below correspond to the number of beeps for the corresponding error All errors listed with the exception of number eight are fatal errors No of Beeps Error Message 1 Refresh Failure The memory refresh circuitry is faulty 2 Parity Error A parity error was detected in the first 64K block of system memory 3 Base 64KB Memory Failure A memory failure occurred wi
4. saving the changes The PgUp and PgDn keys are used to scroll through the selections for a given setting PgUp is also used to increase the setting and PgDn to decrease the setting In addition you may also enter the setup utility directly by pressing the Cntrl Alt Esc simultaneously After making the desired selections from the various setup menus you can save your selections by pressing the F10 key or by selecting the appropriate selection from the MAIN SETUP MENU Notes 1 The user should be aware that improper selection of certain values in the BIOS FEATURES SETUP UTILITY may cause unpredictable results If this occurs select the MAIN SETUP MENU and then select the LOAD BIOS DEFAULTS to load the BIOS default values SECTION 4 USING THE PROMDISK CHIP Disk EMULATOR The PROMDISK Chip Disk Emulator operates as a Read Write fixed disk drive The paragraphs that follow describe how to use the optional PROMDISK Chip USING ROM DOS AND OTHER DISK OPERATING SYSTEMS The PROMDISK Chip has been pre configured at the factory with the latest version of the Datalight ROM DOS disk operating system In addition a current copy of the operating system is supplied on a floppy diskette If the operating system is accidentally erased from the PROMDISK Chip it may be restored using the SYS command The DOS format utility should not be used to restore the operating system To change the operating system version or type you should simply use the equiva
5. the following procedure to install the PROMDISK Chip 1 Align pin one white dot on the PROMDISK Chip with pin one of socket U7 on the CPU board 2 Push the PROMDISK Chip into the socket carefully until it is fully seated 3 Check to make sure the PROMDISK Chip is installed securely and there are no bent pins To remove the PROMDISK Chip insert a small screwdriver between the PROMDISK Chip and the socket and gently pry around the edge until the PROMDISK Chip is released from the socket COMPLETING THE INSTALLATION To complete the installation the following steps should be followed 1 Set the configuration jumpers in accordance with Appendix E 2 Install the IHV 486 5x86 SBC into one of the I O slots in a passive backplane 3 Connect the applicable I O cables and peripherals i e floppy disk IDE hard disk monitor keyboard power supply etc 4 Connect an IBM PC compatible keyboard 5 Turn power on to the display monitor 6 Turn power on to the backplane power supply 7 After the BIOS sign on message is displayed press the Del key to enter the Setup Utility 8 Reconfigure the IHV 486 5x86 CMOS using the internal SETUP 9 Boot the system APPENDIX A SPECIFICATIONS This appendix lists the specifications for the IHV 486 5x86 All In One Single Board Computer CPU Co processor I O Ports PCI Video Port PROMDISK Supports 486 5x86 DX2 DX4 and AMD Cyrix 5x86 3 3V 3 45V microprocessors up to 133
6. 14 bytes used by the system BIOS Should your CMOS become corrupted i e loss of battery power or accidentally clobbered strange errors may occur while attempting to run your programs Refer to Section 3 0 for instructions on resetting the initial SETUP values KEYBOARD PORT The IHV 486 5x86 SBC contains an IBM PC AT compatible keyboard controller for interfacing to a generic IBM PC AT compatible keyboard The keyboard controller assembles the serial data from the keyboard into bytes and interrupts the CPU via IRQ1 after each byte is ready to be read The IRO1 service routine reads port 60H to get the keyboard scan code and acknowledges by sending a positive pulse to port 61H to clear the interrupt for the next byte Refer to Appendix D for the keyboard connector location and pin assignments MOUSE PORT The IHV 486 5x86 SBC contains an IBM PS2 compatible mouse port for interfacing to a generic serial mouse The mouse port controller assembles the serial data from the mouse into bytes and interrupts the CPU via IRQ1 after each byte is ready to be read The IRQ1 service routine reads port 60H to get the scan code and acknowledges by sending a positive pulse to port 61H to clear the interrupt for the next byte Refer to Appendix D for the mouse port connector location and pin assignments SPEAKER PORT The IHV 486 5x86 SBC contains an on board sub miniature audio speaker to provide audio interface to the user Because of the small size of the spea
7. IHV 486 5x86 Single Board Computer User s Manual For MCSI PART NO 88000 IHV 486 5x86 All In One Single Board Computers For Industrial Embedded Systems Applications MICRO COMPUTER SPECIALISTS INC The Embedded PC Specialists 2598 Fortune Way Vista CA 92083 US A Voice 760 598 2177 Fax 760 598 2450 Technical Support BBS 760 598 2179 Revised April 6 1999 Revision 1 5 Changes are made periodically to the information contained herein these changes will be incorporated into new editions of this document Requests for copies of this publication or the product s which it describes should be made to MCSI While every effort has been made to insure that this document and its accompanying product s are free from defects MCSI its distributors representatives and employees shall not be responsible for any loss of profit or any other commercial damage including but not limited to special incidental consequential or other damages occasioned by the use of this product s In the event of defect the buyer s sole recourse is to receive a refund or replacement unit at MCSI s discretion if notified within the time period covered by the product warranty 1996 MCSI Micro Computer Specialists Inc All Rights Reserved PROMDISK is a registered trademark of Micro Computer Specialists Inc CARDTRICK is a register trademark of Datalight Inc ROM DOS is a register trademark of Datalight Inc IBM is a registered trademar
8. MHz Internal to the 486 5x86 Chip System Memory Expandable to 64M bytes Supports 512Kx36 1Mx36 2Mx36 4Mx36 or 8Mx36 SIMMs using two 72 pin SIMM sockets Both standard and high performance EDO DRAM is supported Internal 8K byte Data and 8K byte Instruction Cache Memory 128K High Speed Cache Memory AWARD BIOS with Internal SETUP and ROM defaults PC AT Compatible with internal Lithium battery back up IBM PC AT Compatible 98 pin Edge Connector 7 Channels 4 8 bit amp 3 16 bit 3 Programmable Controlled by on board power detector with provisions for external reset switch at header CN12 2 RS 232 Serial Ports COM1 at rear connector CN10 and COM2 at header CN6 1 Parallel Printer Port at header CN5 1 PS2 Keyboard Port at header CN7 and at rear PS2 type connector CN11 1 On board Speaker with Speaker Port at header CN2 1 Dual 3 5 5 25 Floppy Disk Port at header CN4 1 Enhanced IDE Hard Disk Port at header CN1 1 WatchDog Timer 1 PS2 Mouse Port at rear connector CN9 1 PCI SVGA Video Port at rear connector CN8 Chipset Cirrus Logic CL GD54M40 VRAM 1M byte Resolution 1024x768 256 Colors 1280x1024 16 Colors 1 32pin socket U7 supports MCSI 4M 8M 16M or 32M PROMDISK Chip 25 133MHz jumper selectable Lithium for Clock Calendar amp CMOS RAM ten years typical LANDMARK v2 0 444MHz for 133MHz AMD5x86 P75 Half Size AT board 7 1 L X 4 8 H 12 Oz 5VDC O 2 5A 11 APPENDIX B BOARD OUTLINE T Uld SP
9. ORT 6ND 8ND 0 AYDIASIAWOHd O 8Id LId HND s el std 9Id Ce vid f o SR o TId fa OTa f Pos 6af le T 8d kl ENDZIND Lal sdf val eal zaf es Ce 07 078078 maung o 9d 0708 TNO 12 APPENDIX C MEMORY AND YO MAPS The following is the memory map for the IHV 486 5x86 SBC The addresses are fully PC AT compatible unless otherwise specified IHV 486 5x86 SBC Memory Map Address Used For External to the LHV 486 5x86 The following is the I O map for the IHV 486 5x86 SBC I O addresses are fully PC AT compatible unless otherwise specified IHV 486 5x86 SBC I O Map Adress Function CC System Timers IDE Hard Disk 3F8H 3FFH Serial Port COM1 443H WatchDog Timer APPENDIX D CONNECTORS CN7 Keyboard Header Connector Pin Signal CN4 Floppy Disk Port Connector Pin SignalName 6 NotUsed 3 INDEX All odd numbered pins are GND CN1 Enhanced IDE Hard Disk Port Connector
10. RE Ea E E Aa EE AEREE RE E E REESE RE REEE EE Appendix A Specifications Appendix B Board Outline Appendix C Memory and I O Maps Appendix D Connectors Appendix E Configuration Jumpers Appendix F BIOS Error Beep Codes 11 12 13 14 17 19 SECTION I INTRODUCTION The IHV 486 5x86 All In One Single Board Computer SBC is a high performance system board that provides the primary elements for building an IBM PC AT compatible computer for a wide variety of embedded systems applications The IHV 486 5x86 SBC contains all the basic elements found in a standard IBM PC AT compatible desktop computer system plus some unique features which make it ideally suited for industrial applications The most outstanding features include an on board SVGA display controller a WatchDog timer an optional PROMDISK Chip Disk Emulator single 5VDC operation and a compact half size form factor The optional PROMDISK disk emulator comes complete with the ROM DOS version 6 22 operating system and emulates a bootable hard disk drive with capacities up to 32M bytes The WatchDog timer and PROMDISK Chip makes the board ideally suited for controlling critical processes where unattended operation is essential The compact half size form factor makes it ideally suited for embedded applications The IHV 486 5x86 SBC is fully compatible with the IBM PC AT ISA Bus which means virtually all the software written for
11. apacities and comes complete with ROM DOS version 6 22 installed The PROMDISK Chip occupies a 32K block of memory space above 640K whose starting address is selected by jumper JP20 The PROMDISK Chip uses the Datalight CardTrick VBF integrated Flash File System and boot utilities The CardTrick Variable Block Flash VBF File System and ROM DOS allow the PROMDISK Chip to operate as a non volatile Read Write disk drive This means that you can list directories copy files and read and write the Flash memory on PROMDISK Chip through standard DOS interrupts and commands SVGA DISPLAY PORT The IHV 486 5x86 SBC includes a Cirrus Logic CL GD54M40 Super VGA graphic accelorator and display controller which interfaces directly to the local on board PCI bus The SVGA display port is fully compatible with IBM VGA EGA CGA and MDA display adapters and provides improved performance and additional functionality The board includes 1M bytes of high speed video SRAM The SVGA display controller supports the following display resolutions 1024x768 256 Colors 1M VRAM 1280x1024 16 Colors 1M VRAM WATCHDOG TIMER The IHV 486 5x86 SBC includes a WatchDog Timer circuit The WatchDog Timer ensures that if an application program gets lost or bombs the system will reset or a non maskable interrupt will be issued to the CPU The WatchDog Timer is enabled by reading I O port 443H Once enabled the WatchDog Timer must be triggered by reading I O port 443H with
12. d video memory The cache memory will significantly increase system performance over that of a conventional non cached system DMA CONTROLLER The IHV 486 5x86 SBC memory refresh and DMA functions are included in the System Controller chip which includes the equivalence of two 82C37 DMA controllers The two DMA controllers are 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 for the two DMA devices thereby maintaining IBM PC AT compatibility The DMA channel assignments are listed below DMA Channel 0 Not Used 8 bit DMA Channel 1 Alternate for Multi mode Parallel Port 8 bit DMA Channel 2 Floppy Disk 8 bit DMA Channel 3 Multi mode Parallel Port 8 bit DMA Channel 5 Not Used 16 bit DMA Channel 6 Not Used 16 bit DMA Channel 7 Not Used 16 bit The DMA request DROx and acknowledge DACKx lines are available on the P1 98 pin edge connector INTERRUPT C ONTROLLER The IHV 486 5x86 SBC has the equivalence of two 82C59A interrupt controllers included in the System Controller chip The controllers accept requests from peripherals resolve priorities on pending interrupts and interrupts in service interrupt the CPU and provide the vector address of the interrupt service routine The two interrupt controllers are cascaded in a fashion compatible with the IBM PC AT The interru
13. ial ports use an enhanced RS 232 interface chip which provides 15KV ESD protection The data rates are independently programmable up to 115 2K baud Refer to Appendix D for the connector location and pin assignments FLOPPY DISK PORT The IHV 486 5x86 SBC contains an IBM PC AT compatible dual floppy disk port with the equivalence of an NEC PD72056B Floppy Disk Controller an on chip digital data separator and an IBM PC AT compatible floppy disk adapter bus interface circuit The Floppy Disk Port can be disabled by using the CMOS Setup utility An on chip digital data separator provides optimum performance with the following disk drive types 5 25 360K Double Sided 3 5 720K High Capacity 5 25 1 2M High Capacity 3 5 1 44M High Density 3 5 2 88M High Density Refer to Appendix D for the connector location and pin assignments ENHANCED IDE HARD Disk PORT The IHV 486 5x86 SBC contains a PCI Extended Integrated Drive Electronics IDE Port which directly interfaces to two hard disk drives with embedded controllers The IDE Disk Port can be disabled using the CMOS Setup utility Refer to Appendix D for the connector location and pin assignments OPTIONAL PRO MDISK CHIP Disk EMULATOR The IHV 486 5x86 includes a 32 pin socket designed to accept the MCSI PROMDISK Chip The PROMDISK Chip Disk Emulator is a unique Flash Memory array which emulates a bootable read write hard disk drive The PROMDISK Chip is offered in 4M 8M 16 and 32M byte c
14. in the time out period otherwise the WatchDog Timer will force a hardware reset or activate the IOCHCK line generating a non maskable interrupt NMI The WatchDog Timer can be disabled by reading I O port 43H A jumper is provided to select the time out period and to enable the WatchDog Timer circuit Refer to Appendix E for the WatchDog Timer configuration jumpers SECTION 3 SETUP The IHV 486 5x86 SBC uses the latest AWARD BIOS which contains an internal Setup Utility for configuring the system The system configuration settings are stored in the on board CMOS memory which is backed up by a Lithium battery Should your CMOS become corrupted i e loss of battery power or accidentally clobbered strange errors may occur while attempting to run your programs If this occurs select the LOAD BIOS DEFAULTS from the MAIN SETUP MENU or use the Del key The Setup Utility can be invoked by first causing a cold boot reset or a warm boot Cntrl Alt Del and pressing the Del key when instructed This will cause the memory diagnostics to be aborted and the Setup Utility to display the MAIN SETUP MENU Using the gt TJ lt cursor keys move the highlighted bar to the option you wish to modify and then press Enter to select it When in the MAIN SETUP MENU the F2 key is used to select the colors used in the setup screens and the F10 key is used to save the changes before exiting the Setup Utility The Esc key may be used to exit the Setup Utility without
15. k of International Business Machines Corporation PC XT amp PC AT are registered trademarks of International Business Machines Corporation MS DOS is a registered trademark of Microsoft Corporation All other trademarks are the properties of their respective holders PREFACE This manual provides information about the MCSI IHV 486 5x86 All In One Single Board Computer This information is intended for users who must implement IBM PC AT compatible computer solutions to a wide variety of applications which cannot be satisfied using conventional desktop computers This manual assumes that the reader has a good understanding of MS DOS and the standard IBM PC AT compatible architecture For more information on the IBM PC compatible hardware and software architecture refer to any of the many books available on the subject A few suggestions are listed below e Advanced MS DOS Programming Microsoft Press Programmers Guide to the IBM PC Microsoft Press eProgramming the 80386 Sybex eUndocumented DOS Addison Wesley INVENTO RY C HEC KLIST The complete IHV 486 5x86 All In One Single Board Computer package consists of the following IHV 486 5x86 All In One Single Board Computer 3 Diskette containing VGA Video Drivers PROMDISK Chip Software Utilities with ROM DOS ver 6 22 optional This Manual If any of the above is missing or appears to be damaged inform MCSI immediately Table of Contents Section 1 Introduction OUT AP a A Dera A
16. ker the sound output is much reduced over that of the larger speaker found in most desktop computers A connector is provided to connect an external speaker if the sound output is not sufficient Refer to Appendix D for the speaker port connector location and pin assignments RESET SWITCH The IHV 486 5x86 SBC includes an on board power detector and power on reset circuit to reset the computer after power is applied and to hold the computer reset during low power brown out conditions In addition there are provisions for connecting an external normally open push button reset switch Refer to Appendix D for the reset switch connector location and pin assignments PRINTER PORT The IHV 486 5x86 SBC contains a multimode parallel port which has the equivalence of an IBM PC AT Parallel Printer Port The multimode parallel printer port supports the PS 2 type bi directional parallel port SPP the enhanced parallel port EPP and the extended capabilities port ECP parallel port modes The port can be configured as a standard IBM PC AT compatible LPT1 LPT2 or LPT3 printer port or disabled completely using the CMOS Setup utility Refer to Appendix D for the connector location and pin assignments SERIAL PORTS The IHV 486 5x86 SBC has the equivalence of two NC16C550 UARTs The two UARTs can be configured as standard IBM PC AT RS 232C compatible COM1 COM2 COM3 or COMA serial ports or individually disabled using the CMOS Setup utility The ser
17. lent DOS SYS command to transfer the operating system PROM DISK Low LEVEL FORMAT The Flash memory contained on the PROMDISK Chip board was initialized with the Datalight CardTrick low level format at the factory During normal operation the Flash memory should never require reformatting unless there is a serious hardware or software malfunction In the event it has been determined that the low level format is corrupted proceed as follows 1 At the DOS prompt run the PROMDISK Chip low level format utility PDCFMT EXE located on the distribution diskette in the PDCHIP subdirectory 2 Install a bootable floppy diskette in drive A and boot the system 3 At the DOS prompt type SYS C to transfer a bootable copy of DOS to PROMDISK Chip 4 Remove the floppy diskette from drive A and reboot the system from PROMDISK Chip CAUTION Do Not use the DOS Fdisk utilities on the PROMDISK Chip SECTION 5 INSTALLATION This section describes the procedures for installing the IHV 486 5x86 All In One Single Board Computer into your system The following is a list of typical peripherals required to build a minimum system Passive Backplane and Power Supply IBM PC AT Type Keyboard Display Monitor Floppy or Hard Disk with MS DOS ROM DOS or PROMDISK Disk Emulator INSTALLING THE SIMMs When installing or removing the DRAM SIMMs be sure to first touch a grounded surface to discharge any static electricity from your body Use the following proced
18. pt priority and assignments are shown below in descending order of priority Highest IOCHCK Parity Check Non maskable IRQO System Timer Not Available IRQ1 Keyboard Not Available IRQ8 Real Time Clock Not Available IRQ9 SVGA Controller IRQ10 Not Used IRQ11 Alternate for Serial Port 2 IRQ12 Alternate for Serial Port 1 IRQ13 Co processor Not Available IRQ14 Not Used IRQ15 Not Used IRQ3 Serial Port 2 IRQ4 Serial Port 1 IRQ5 Alternate for Parallel Port IRQ6 Floppy Disk Controller Lowest IRQ7 Parallel Port The interrupt request lines IRQx and IOCHCK are available on the 98 pin edge connector except as noted on the previous page TIMERS The IHV 486 5x86 SBC has the equivalence of an 82C54 Programmable Timer included in the System Controller chip The 82C54 is a three channel Programmable Counter Timer chip The three timers are driven by a 1 19MHz clock source derived from the on board 14 31818MHz crystal oscillator The three timers are used as follows TIMER Channel 0 System Timer TIMER Channel 1 Timer for DRAM refresh TIMER Channel 2 Tone Generation for Audio CLOCK CALENDARAND CMOS RAM The IHV 486 5x86 SBC uses a Dallas DS12887 which is the equivalence of an MC146818 real time clock calendar with 128 bytes of CMOS RAM An internal lithium battery provides power to the RTC chip for at least ten years when the system power is off The 128 byte CMOS RAM consists of 14 bytes used by the clock calendar and 1
19. the IBM PC AT will run on the IHV 486 5x86 SBC FEATURES A complete list of features is listed below IBM PC AT Compatible Plug in Computer e Supports 3 3V 3 45V 486 5x86 DX2 DX4 and AMD Cyrix Microprocessors to 133Mhz e Super VGA PCI Local Bus Video Controller with 1M byte Video Memory ALI Chip Set e AWARD BIOS e Optional PROMDISK Chip Disk Emulator includes ROM DOS 6 22 Operating System e Passive Backplane Architecture 64M Byte Standard or EDO DRAM System Memory 2 72pin SIMMs e 128K High Speed Secondary Cache Memory e PS2 AT Compatible Keyboard Port e PS2 Compatible Mouse Port e Two High Speed 16C550 Compatible RS 232 Serial Ports with 15KV ESD Protection e Multimode Bi directional Parallel Printer Port e Clock Calendar with Battery Back up e Low Power CMOS Design e Half Size AT Plug in Multilayer Board for Low EMI and High Reliability e WatchDog Timer and Power Monitor e Dual Floppy Disk Port Supports Two 3 5 or 5 25 Drives up to 2 88M bytes e PCI Extended IDE Hard Disk Port e On board Mini Speaker e Optional External Reset SECTION 2 SYSTEM DESCRIPTION The following sections describe the major system features of the IHV 486 5x86 All In One Single Board Computer PROCESSOR The IHV 486 5x86 SBC supports high performance low voltage 3 3 3 45V 486 5x86 DX2 DX4 microprocessors from 25MHz to 100mhz and up to 133MHz AMD Cyrix 5x86 microprocessors The 486 5x86 microprocessor includes an on chip 8K b
20. thin the first 64KB of memory 4 Timer Not Operational Timer 1 has failed to function properly 5 Processor Error The CPU chip has generated an error 6 8042 Gate A20 Failure The keyboard controller 8042 contains the Gate A20 switch which allows the CPU to operate in virtual mode This error message means that the BIOS is not able to switch the CPU into protected mode 7 Processor Exception Interrupt Error The CPU chip has generated an exception interrupt 8 Display Memory Read Write Error The video adapter is either missing or the video memory is faulty PLEASE NOTE This is not a fatal error 9 ROM Checksum Error The ROM checksum value does not match the value encoded in the BIOS 10 CMOS Shutdown Register Read Write Error The shutdown register for the CMOS memory has failed 11 Cache Memory Read Write Error A Cache Memory failure occurred do not enable the Cache Memory to resume operation
21. ure to install the SIMMs 1 Insert the first SIMM edge connector at a slight angle into either the SIMM1 or SIMM2 socket Note that the SIMMs are keyed and will only go in one way 2 Push the SIMM back into the connector carefully until it snaps into place 3 Check to make sure the SIMM is inserted securely 4 If required insert the second SIMM edge connector at a slight angle into the remaining SIMM socket To remove a SIMM use a small screw driver to pull back the holding clip on each side of the SIMM and lift the SIMM from the connector INSTALLING THE CPU When installing or removing the CPU be sure to first touch a grounded surface to discharge any static electricity from your body Use the following procedure to install the CPU 1 Align pin one white dot or beveled edge on the CPU chip with pin one of the of the CPU socket Note pin 1 of the CPU socket is located on the top left corner To complete the installation gently press the CPU chip into place 2 Double check the insertion and orientation of the chip before applying power Improper installation will result in permanent damage to the chip To remove the CPU chip insert a small screwdriver between the CPU and the socket and gently pry around the edge until the CPU is released from the socket INSTALLING THE PROM DISK CHIP When installing or removing the PROMDISK Chip be sure to first touch a grounded surface to discharge any static electricity from your body Use
22. yte unified instruction cache an 8K byte data cache an internal high performance math co processor and an enhanced 64 bit data bus The on board jumper selectable clock generator makes upgrading to a higher performance CPU easy Some of the distinctive features of the processors include e 64 bit External Data Bus e 32 bit Internal Architecture e 128M byte Directly Addressable Memory Space e Internal 14 Word by 32 bit Register Set Separate 8K byte Data and Cache Memories e On chip Pipelined Floating Point Processor e Integrated Memory Manager SYSTEM Memory DRAM The IHV 486 5x86 SBC can support up to 64M bytes of dynamic random access memory DRAM organized as two banks of 8Mx72 including eight parity bits The board will support either standard or high performance EDO DRAM The memory is configured using two single in line memory module sockets which will accept 72 pin single in line memory modules SIMMs organized as 1MB 2MB 4MB 8MB 16MB or 32MB with a maximum access time of 70ns The following table demonstrates some of the most common memory configurations pical Memory Configurations T im sxs NI ST2Kx36 1Mx36 2 4Mx36 8Mx36 Bank 0 SIMM 1 Bank 2 SIMM 2 Note SIMMs may be installed in either Bank first 2Mx36 CACHE MEMORY The IHV 486 5x86 SBC includes 128K bytes of cache memory for high speed access to blocks of data most recently read from main memory including buffered data from the disk an
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