UMC 486DX/486DX2/486SX System Board
Contents
1. lt Pr trate 3 meme 456DX 456DX2 4868 X System Boar User s Manual CONTENTS PAGE lh JINIRODUCIION rcbus 1 1 2 GENERAL SPEGIFICATIONS aaa 2 1 MEMORY CONFIGURATION 3 1 3 1 Memory Bank Configuration 3 1 3 2 Possible Memory Configuration 3 1 4 TING SPEED Sua aaa t iet 4 1 ie punanata Da awa 5 1 6 CONNECTOR PIN ASSIGNMENT I 6 1 J OADDRESSMAPPING ori seri 7 1 3 IEXPAINOGION eade 8 1 9 BIOS SE CIP eig 9 1 Warning usuy ett tte e 9 2 9 2 Standard CMOS SeU Pisca ater tute dei ses 9 3 9 3 Auto Configuration with BIOS Defaults 9 5 9 4 Auto Configuration with Power On Defaults 9 6 Advanced C MOS Sepu y y u e 9 7 Change Password uu u 9 10 10 MAIN BOARD EA EO 10 1 1 INTRODUCTION The manual is prepared for both the users who want to install the 486DX system board in their system and the programmers who want to utilize the 486DX system for special functions The 486DX system board is based on the 80486DX or 80486SX microproces sor and the high performance UMC 82C481B 82C482A 82C206 chipset which includes peripheral controller data address buffer and advanced memory manager2. 1 211 Video or Adaptor ROM Shadow ROM shadow is a procedure in which BIOS code is copied from slower ROM to faster RAM The BIOS is then executed from the RAM Each option allows for a segment of 16KB to be shadowed from ROM to RAM If one of these options is enabled and there is BIOS present in that particular 16KB segment the BIOS will be shadowed System ROM Shadow The same concept applies here as above except that in this case the system BIOS 64KB in length is shadowed 9 6 Change Password The BIOS SETUP program has an optional password feature The system can be configured so that the user is required to enter a password every time the system boots or whenever an attempt is made to enter the setup program This section of the manual deals with changing the user password The password check function is enabled in Advanced CMOS Setup refer to previous The password check function is enabled by choosing either Always or Setup The password which will be stored in the CMOS cannot exceed 6 characters in length A null default password to be used if the CMOS is corrupted is storedin the ROM Thenull password will disable the Password Check option So a user defined password must be entered in the CHANGE PASSWORD option in the main setup screen before the Password Check Option can function To change the user password select the Change Password option from the main Setup screen by using the arrow keys to mov
3. Date Enter in the format Month Date Year Ranges for each value are listed below in prompt box in the lower left corner of the CMOS Setup Screen i Time Enter in the format Hour Minute Second Uses 24 hour clock format 111 lV Vi Vil Hard Disk C and Hard Disk D Hard disk types from 1 to 46 are standard ones If the hard disk in your system which does not belong to any one of the standard types you can choose type 47 for user definable type and enter hard disk parameters Cylinders Heads Write precompensation Landing Zone Floppy Drive A and Floppy Drive B The options are 360KB 5 1 4 1 2MB 5 1 4 720KB 3 1 2 1 44MB 3 1 2 and Not Installed NotInstalled could be used as an option for diskless workstations Primary Display Options are Monochrome Color 40x25 VGA PGA EGA Color 80x25 and Notinstalled The Notinstalled option could be used for network file servers Keyboard Options are Installed or Not Installed Extended Memory If 1MB or more memory is installed 128KB is reduced from the total memory and reserved for BIOS shadow 9 3 Auto Configuration with BIOS Defaults The Auto Configuration with BIOS feature uses the default system values before the user has changed any CMOS values If the CMOS is corrupted the BIOS defaults will automatically loaded The system board will have the optimal performance with the BIOS defaults Usually you need not alter the Advanced CMOS Setup once the BIOS de
4. The system board is fully compatible with the IBM PC AT On board memory can be expandable from 1MB up to 16M bytes or 48MB if HDSIMM RAM modules are installed The cache memory size can be configurable as 64K 128K or 256K 2 GENERAL SPECIFICATIONS The 486 system board has the following general specifications qd D D O D D The 486 system board is based on the 80486DX 33 or 80486SX 25 CPU High performance UMC 82C481B 82C482A 82C206 486 AT compatible chipset is used On board DRAM sub system expandable from 1MB to 16MB or 48MB if HDSIMM are installed Support 256KBX9 1MBX9 or 4MBX9 SIMM memory module X Support shadow for system BIOS and video BIOS AMI AT compatible BIOS is used The CPU speed is selectable by jumper or eyboard control 3 Programmable timer counters 16 Levels of system interrupts 7 Direct Memory Access DMA channels On board battery bac up for CMOS configuration table and real time cloc Six 16 bit expansion slots and two 8 bit expansion slots 3 o 3 2 1 MEMORY CONFIGURATION Memory Ban Configuration Remar X means don t care x N Possible Memory Configuration Jumper Setting JP8 X JP9 1 2 Ban 0 Ban 1 amp 2 SM1 SM4 SM5 Total 256Kx9 x 4 256Kx9 x 4 256Kx36 256Kx9 x 4 512Kx36 1Mx9 x 4 256Kx9 x 4 1Mx36 1Mx9 x 4 1Mx36 256Kx9 x 4 2Mx36 1 9
5. before any changes are allowed to any of the setup parameters BIOS SETUP PROGRAM WARNING INFORMATION C 1991 American Megatrends Inc All Rights Reserved Improper Use of Setup may Cause Problems If System Hangs Reboot System and Enter Setup by Pressing the lt DEL gt key Do any of the following After Entering Setup i Alter Options to make System Work ii Load BIOS Setup Defaults iii Load Power On Defaults Hit lt ESC gt to Stop now Any other key to Continue 9 2 Standard CMOS Setup Standard CMOS Setup is the first option on the main setup menu Press ENTER at the highlighted selection to access this option The screen as below will appear BIOS SETUP PROGRAM STANDARD CMOS SETUP 1991 American Megatrends Inc All Rights Reserved Date mn date year 22 1991 Base memory 640 KB Time hour min sec 10 42 44 Ext memory 0 Head WPcom Lzone Sect Size Hard disk C type 17 977 5 300 977 17 41MB Hard disk D type Not Installed Floppy drive A 12MB 51 4 SunMonlTueWedThu Fri Sat TEE e 3111 12131415 Primary display VGA PGA EGA 2 Keyboard Installed 28 29 30 1 2 3 4 5 08 17 ac 911012 Month Jan Feb Dec Date 01 02 O3 31 Year 1901 1902 2099 ESC Exit VT Select F2 F3 Color PU PD Modify The Standard CMOS Setup utility is used to configure the following features i
6. with the 486 system board The BIOS provides an on screen interactive configura tion setup utility This setup utility allows setting of time date type of floppy drivers type of hard disk type of display adapter CPU speed memory configuration and BIOS shadow memory The SETUP utility is built in with the BIOS It can be invoked by pressing the DEL key as instructed on the screen after the system warmor cold start A main menu will pop up as follows BIOS SETUP PROGRAM AMI BIOS SETUP UTILITIES C 1991 American Megatrends Inc All Ri ADVANCED CMOS SETUP ADVANCED CHIPSET SETUP AUTO CONFIGURATION WITH BIOS DEFAULTS AUTO CONFIGURATION WITH POWER ON DEFAULTS CHANGE PASSWORD HARD DISK UTILITY WRITE TO CMOS AND EXIT DO NOT WRITE TO CMOS AND EXIT Standard CMOS Setup for Changing Time Date Hard Disk Type etc ESC Exit VME 561 F2 F3 Color F10 Save amp Exit Use arrow keys to move cursor to the desired selection For the ease of configuration you can select Auto Configuration With BIOS Defaults first and then go to the Standard CMOS Setup You need not go through the Advanced CMOS Setup or Advanced Chipset Setup unless you have a good technical knowledge of the chipset or want to use some extended features 9 1 Warning Information A warning message shown as below is displayed each time when one of the first three options Standard CMOS Setup Advanced CMOS Setup and Advanced Chipset Setup is selected
7. x 4 2Mx36 4Mx9 x 4 1Mx9 x 4 4Mx36 4Mx9 x 4 4Mx36 1Mx9 x 4 8M x36 4Mx9 x 4 8Mx36 11 11 Jumper Setting JP8 2 3 JP9 2 3 256Kx36 256Kx36 1Mx36 256Kx36 1Mx36 4Mx36 1Mx36 4Mx36 Ban 1 SM1 SM4 Total 256Kx9 x 4 1Mx9 x 4 1Mx9 x 4 4Mx9 x 4 4Mx9 x 4 Jumper Setting JP8 1 2 JP9 2 3 Ban 2 SM1 SM4 Total 256Kx9 x 4 1Mx9 x 4 Ban 0 amp 1 SM5 512Kx36 512Kx36 512Kx36 2Mx36 2Mx36 2Mx36 8Mx36 8Mx36 1 9 x 4 4 9 x 4 4Mx9 x 4 4 CPU OPERATING SPEED The 486 system board can run at either non turbo mode or turbo mode The selection can be done by either a turbo switching button connected to jumper TB SW or using eyboard control Key in Sequence Operating Mode Ctrl_Alt_ Non turbo mode 5 JUMPER SETTING Following are the details specification of jumpers Reset Short Open TBSW Open Short Short Open JP7 Open Short JP2 JP11 2 3 1 2 3 4 Open 2 3 1 2 1 2 3 4 Reset Switch Reset the system Normal Turbo Switch Connector Non turbo mode Turbo mode Display Type Selection CGA Monochrome EGA VGA External Internal Battery Select External Battery Select Internal Battery CPU Type 486DX 486SX 4875 W15 W14 1 2 W17 W16 W10 1 2 1 2 2 3 On 2 3 1 2 On W11 Off Off On W13 W12 Off Off Off On On On Cache
8. RAM 8Kx8 U25 32 8Kx8 U25 U27 U29 U31 32Kx8 U25 U32 Tag RAM 8Kx8 U24 8Kx8 U24 32Kx8 U24 Cache Size 64K 128K 256K Cacheable Size 16MB 32MB 64MB CONNECTOR PIN ASSIGNMENT CN1 WN KB1 Spea er E O N Power Connector Power Good 5V 12V 12V Ground Ground Ground Ground 5V 5V 5V 5V Keyboard Connector Cloc Data Spare Ground 5V Spea er Connector Spea er No Connection Ground Spea er Keyloc WN Keyloc amp Power LED 5V No Connection Ground Keyboard Inhibit Ground Turbo LED LED LED External Battery Connector 3 6V 4 5V No Connection Ground Ground I O ADDRESS MAPPING Hex Range 000 O1F 020 03F 040 OSF 060 06F 070 07F 080 O9F OAO OBF 0C0 ODF OFO 1 OF8 OFF 1F0 1F8 200 207 278 27F 2F8 2FF 300 31F 360 36F 378 37F 380 38F 3A0 3AF 380 3BF 3C0 3CF 3D0 3DF 3F0 3F7 3F8 3FF Devices DMA Controller 1 Interrupt Controller 1 Timer 8042 eyboard Real time cloc NMI mas DMA Page register Interrupt Controller 2 DMA Controller 2 Clear Maths Coprocessor Reset Maths Coprocessor Maths Coprocessor Fixed dis Game I O Parallel printer port 2 Serial port 2 Prototype Card Reserved Parallel printer port 1 SDLC bisynchronous 2 Bisynchronous 1 Monochrome display and printer adap
9. e the cursor to this selection and press ENTER The message Enter CURRENT Password will appear 10 MAIN BOARD LAYOUT KB1 JP7 J6 CN1 JP5 SIMM2 SIMM3 80487SX P23N SPEAKER TB SW 3 1 11 3 KEYLOCK TB LEO RESET W15 W12 C I 1 W13 W11 W10 W16 Wi4 W17 10 1
10. faults have been loaded BIOS SETUP PROGRAM AMI BIOS SETUP UTILITIES C 1991 American Megatrends Inc All Rights Reserved STANDARD CMOS SETUP ADVANCED CMOS SETUP AUTO CONFIGURATION WITH BIOS DEFAULTS Load BIOS Setup Default Values from ROM Table Y N N Load BIOS Setup Defaults Values for Advanced CMOS and Advanced CHIPSET Setup ESC Exit v 2 Sel F2 F3 Color F10 Save Exit If you want to use the BIOS defaults change the promptto Y and press ENTER The following message will appear on the screen Default values loaded Press any key to continue 9 4 Auto Configuration with Power On Defaults This feature uses the default Power On values You may want to use this option as diagnostic aid if your system is behaving erratically BIOS SETUP PROGRAM AMI BIOS SETUP UTILITIES C 1991 American Megatrends Inc All Rights Reserved STANDARD CMOS SETUP ADVANCED CMOS SETUP ADVANCED CHIPSET SETUP AUTO CONFIGURATION WITH BIOS DEFAULTS Load Power On Default Values from ROM Table Y N N Load Power On Defaults Values for Advanced CMOS and Advanced CHIPSET Setup ESC Exit Sel F2 F3 Color F10 Save Exit If you want to use the Power On defaults change the prompt to Y and press ENTER The following message will appear on the screen Default values loaded Press any key to continue 9 5 Adoanced CMOS Setup The Advanced CMOSSetup program is equipped with a series of help screens acces
11. k W4167 coprocessor is installed Floppy Drive Seek At Boot 1X The default for this option is Disabled to allow a fast boot and to decrease the possibility of damage to the heads System Boot up Sequence The AMI BIOS will normally attempt to boot from floppy drive A if present and if unsuccessful it will attempt to boot from hard disk C This sequence can be switched using this option If the option is set to C A the system will attempt to boot from the hard disk C and then the If the option is set to the sequence is reversed Password Check Option The password feature can be used to prevent unauthorized system boot up or unauthorized use of BIOS SETUP The option in the BIOS SETUP only allows the user to enable the password check option every time the system boots or upon entering SETUP only The program allows three attempts to key in the correct password After each incorrect attempt the prompt to enter the current password will appear followed by an X After the third incorrect attempt the system will lock and it will be necessary to re boot The screen will not display the characters entered If the Always option is chosen at Setup each time the system is turned on i e booted the prompt for user password will appear The default option is Setup The password prompt will not appear when the system is turned on but will appear if the user attempts to enter the Setup program
12. own the character appears on the screen and after a delay set by the Typematic Rate Delay it keeps on repeating ata rate set by the Typemetic Rate value When two or more keys are pressed and held down simultaneously only the last key pressed will be repeated at the typematic rate This stops when the last key pressed is released even if other keys are depressed Above 1MB Memory Test This feature when enabled will invoke the POST memory routines on the RAM above the 1MB if present on the system If disabled the BIOS will only check the first 1MB of RAM Memory Test Tick Sound This option will enable or disable the ticking sound during the memory test Memory Parity Error Check If the system board does not have parity RAM you may disable the memory parity error checking routines in the BIOS Hit lt DEL gt Message Display Disabling this option will prevent the message Hit lt DEL gt if you want to run SETUP from appearing on the screen when the system boot up Hard Disk Type 47 Data Area The AMI BIOS SETUP features two user definable hard disk types Normally the data for these disk types are stored at 0 300 in lower system RAM Ifa problem occurs with other software this data can be located at the upper limit of the DOS Shell 640KB If the option is set to DOS 1KB the DOS Shell is shortened to 639KB and the top 1KB is used for the hard disk data storage V11 Weitek Processor This should be enabled if Weite
13. sed by the F1 key which will display the options available for particular configuration feature and special help for some of the options BIOS SETUP PROGRAM ADVANCED CMOS SETUP C 1991 American Megatrends Inc All Rights Reserved Typematic Rate Programming Typematic Rate Delay msec Typematic Rate Chars Sec Above 1 MB Memory Test Memory Test Tick Sound Memory Parity Error Check Hit lt DEL gt Message Display Hard Disk Type 47 RAM Area Wait for lt F1 gt If Any Error System Boot up Num Lock Weitek Processor Floppy Drive Seek At Boot System Boot up Sequence System Boot up CPU Speed Cache Memory Gate A20 Emulation Password Checking Option Video ROM ESC Exit Sel Ctrl Pu Pd Modify F1 Help F2 F3 Color 2 1 F5 Values F6 BIOS Setup Defaults F7 Power On Defaults Disabled 500 15 Disabled Disabled Disabled Disabled 0 300 Disabled Enabled Absent C Enabled High Both Both Setup C000 16K Enabled Adapter ROM Adapter ROM Adaptor ROM Adaptor ROM Adaptor ROM Adaptor ROM Adaptor ROM Adaptor ROM Adaptor ROM Enabled Disabled Disabled Disabled Disabled Disabled Disabled Disabled Enabled 111 Typematic Rate Programming By enabling this option you can adjust the rate at which a keystroke is repeated The options Typemetic Rate Delay and Typematic Rate affect this rate When key is pressed and held d
14. ter Reserved Color Graphics Adapter Floppy dis ette controller Serial port 1 Usage system system system system system system system system system system system I O I O I O I O I O I O I O I O I O I O I O I O I O I O 8 EXPANSION SLOTS 8 1 62 pin YO BUS Signal Pin Rear panel Pin Signal GND Bl Al I OCHCK RESET DRV B2 2 507 5Vdc B3 556 IRQ9 B4 4 505 5Vdc B5 A5 SD4 DRO2 B6 A6 SD3 12Vdc B7 A7 SD2 0 WS B8 8 SD1 12Vdc B9 A9 5 0 GND B10 A10 I OCHRDY SMEMW 11 A11 AEN SMEMR B12 A12 5 19 IOW B13 A13 SA18 IOR B14 A14 5 17 DACK3 B15 A15 SA16 DROS B16 A16 SA15 DACKI B17 A17 SA14 DROI D18 A18 5 13 REFRESH B19 A19 SA12 BUSCLK B20 A20 5 11 IRO7 21 A21 SA10 IRQ6 B22 A22 SA9 IRQ5 B23 A23 SA8 IRQ4 B24 A24 SA7 IRQ3 B25 A25 SA6 DACK2 B26 A26 SAS 176 B27 A27 SA4 BALE B28 A28 SA3 5 29 29 5 2 OSC B30 A30 SA1 GND B31 A31 SAO Po s 5 8 2 36 pin YO BUS Signal Pin Rear panel Pin Signal MEM CS16 D1 Cl SBHE I O CS16 D2 C2 LA23 1 1 0 D3 C3 LA22 IRQ11 D4 C4 LA21 IRQ12 D5 C5 LA20 IRQ15 D6 C6 LA19 IRQ14 D7 C7 LA18 DACKO D8 C8 LA17 DROO D9 C9 MEMR DACK5 D10 C10 MEMW DROS D11 C11 508 DACK6 D12 C12 SD9 DROQ6 D13 C13 SD10 DACK7 D14 C14 SD11 DROZ D15 C15 5012 5Vdc D16 C16 SD13 MASTER D17 C17 5014 GND D18 C18 5015 9 BIOS 5 AMI AT compatible BIOS Basic Input Output System is supplied along
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