CH-486-33A User`s Manual
Contents
1. 3 6 AUTO CONFIGURATION WITH POWER ON DEFAULTS When you enter AUTO CONFIGURATION WITH POWER ON DEFAULTS the screen will be as follows BIOS SETUP PROGRAM AMI BIOS SETUP UTILITIES C 1990 American Megatrends Inc All Rights Reserved STANDARD CMOS SETUP ADVANCED CMOS SETUP AUTO CONFIGURATION WITH BIOS DEFAULTS AUTO CONFIGURATION WITH POWER ON DEFAULTS Load Power On Default Values from ROM Table Y N N Load Power On Default Values for Advanced CMOS and Advanced CHIPSET Setup I aE l l Sel F2 F3 Color F10 Save amp Exi Press or N to change ADVANCED CMOS SETUP and ADVANCED CHIPSET SETUP with Power on default values Note The Power On default values setup chipset register for mainboard running low performance 3 16 BIOS SETUP 3 9 WRITE TO CMOS AND EXIT The options set in the Standard Setup Advanced Setup Advanced Chip set Setup and the New Password if it has been changed are stored in the CMOS The CMOS checksum is calculated and written into the CMOS After that control is passed back to the BIOS 3 10 DO NOT WRITE TO CMOS AND EXIT Control is passed back to the BIOS without writing to the CMOS BIOS SETUP 3 172. BIOS SETUP 3 11 3 4 ADVANCED CHIPSET SETUP The ADVANCED CHIPSET SETUP option is used to change the register values for the chipset registers The chipset registers control most of the system options in the computer Explanation keys ESC Exit to previous screen Arrow keys Cursor movement PageUp PageDown Ctrl PageUp Ctrl PageDown Modify the value of the option by 1 1 10 10 If the option has less than 10 available answers then lt Ctrl PageUp gt is same as lt PageUp gt and lt CtrlPageDown gt is same as lt PageDown gt F1 Help for the option F2 F3 Change Color FS Get the old values These are the values with the user starting from the current session If the CMOS was good then the old values are the CMOS values hence they are the BIOS Setup default values F6 This will load all the Options in the Advanced CMOS Setup Advanced Chipset Setup with the BIOS Setup defaults F7 This will load all the Options in the Advanced CMOS Setup Advanced Chipset Setup with the Power On defaults 3 12 BIOS SETUP BIOS Setup Program AMI BIOS Utilities C 1990 American Megatrends Inc All Rights Reserved er nee as a Non Cacheable Block 1 Size Disabled Non Cacheable Block Base OKB Non Cacheable Block 2 Size Disabled Non Cacheable Block 2 Base OKB Cacheable RAM Address Range 8MB Video BIOS Area Cacheable Yes L J ESC Exit f Sel Ctrl Pu Pd Modify F1
3. On chip Cache Memory The 8KB on chip cache is a 4 way set associative write through code and data cache memory Individual pages can be designated as cacheable or non cacheable by software or hardware The cache can also be enabled and disabled by software or hardware Hardware Description 2 1 4167 Floating point Coprocessor The WEITEK 4167 is a high performance single chip floating point coprocessor for 80486 microprocessor It is upwardly binary compatible with the WEITEK 3167 coprocessor The 4167 coprocessor is a memory mapped peripheral that communicates with the 80486 over the same address bus that connects the main memory to CPU The coprocessor will respond to memory addresses COQVQQOQ00H through CIFFFFFFH Writing to this address space will cause the 4 167 to execute this fractions and reading from it will cause the coprocessor to drive the data bus 2 2 Connector and Jumper Settings This chapter describes the CH 486 33A main board s jumpers and connectors The system layout are shown on the next page 2 2 Hardware Description 2 3 Hardware Description SW1 Hardware Reset switch Connector swe Hardware Turbo Switch Connector Jt Keyboard Connector J10 External Battery Connector J11 J12 Power Connector J23 Keylock and Power LED Connector J24 Speaker Connector JP12 Turbo LED Connector 9 4 Hardware Description Jumper Description Setting JP1 Monitor Type Selecta
4. 1 bit U33 u47 U49 U51 U55 Note If you want to change second level cache size you must change the SRA M and TAG RAM size and Jumper Setting Hardware Description 2 7 3 BIOS SETUP 3 1 BIOS OVERVIEW The SETUP program is used to configure the system These system options are stored in the CMOS If the CMOS is good the system is configured with the values stored in the CMOS If the CMOS is bad the system is configured with the default values stored in the ROM file There are two 2 sets of BIOS values stored in the ROM file a The BIOS Setup default values a The Power On default values The BIOS Setup default values are the default values which are supposed to give optimum performance for the system They are the best case default values The Power On default values are the default values for the table values for the system They are the worst case default values BIOS SETUP 3 l There are two ways to enter the BIOS setup program 1 Whenever BIOS detects any equipment error or the CMOS contents are not consistent with the equipment 2 After the power on memory test the screen will show Hit lt DEL gt If you want to run setup Press the DEL key to get the following screen 3 2 BIOS SETUP BIOS SETUP PROGRAM AMI BIO S SETUP UTILITIES 1990 American Megatrends Inc Alll Rights Reserved STANDARD CMOS SETUP ADVANCED CMOS SETUP ADVANCED CHIPSET SETUP AUTO CONFIGURATION WITH BIOS DEFAU
5. either state Eg Daylight Savings Enable Daylight Savings Disable On the last Sunday of April the time increments from 1 59 59 am to 3 00 00 am On the last Sunday in October when the time first reaches 1 59 59 am it is rolled back to 1 00 00 am BIOS SETUP 3 7 3 8 3 3 ADVANCE CMOS SETUP The ADVANCED CMOS SETUP option is used to set the various system options for the user The user can get various options some of which are listed below Weitek Processor External Cache Memory Internal Cache Memory Adaptor ROM Shadow Shadow RAM anann BIOS SETUP BIOS SETUP PROGRAM ADVANCED CMOS SETUP C 1990 American Megalrends Inc All Rights Reserved ef Al eee ae ere ee i Weitek Processor Absent External Cache Memory Enabled Internal Cache Memory Enabled Adaptor ROM Shadow C800 16K Disabled Adaptor ROM Shadow CCOO 16K Disabled Adaptor ROM Shadow DOOO 16K Disabled Adaptor ROM Shadow 0400 16K Disabled Adaptor ROM Shadow 0800 16K Disabled Adaptor ROM Shadow 0CO0 16K Disabled Adaptor ROM Shadow EOOO 16K Disabled Adaplor ROM Shadow E400 16K Disabled Adaptor ROM Shadow E800 16K Disabled Adaptor ROM Shadow ECOO 16K Disabled Shadow RAM Option Disabled sats J J 1 Sel Ctrl Pu Pd Modify F 1 Help F2 F3 Color F6 BIOS Setup Defaults F7 Power On Defaults BIOS SETUP 3 9 Explanation of
6. keys ESC Exit to previous screen Arrow keys Cursor movement PageUp PageDown Ctrl PageUp Ctrl PageDown Modify the value of the option by 1 1 10 10 If the option has less than 10 available answers then lt Ctrl PageUP gt is the same as lt PageUP gt and lt Ctrl PageDown gt isthesameas lt PageDown gt FI Opiton for Help F2 F3 Change Color F5 Get the old values These are the values with the user starting from the current session If the CMOS was good then the old values are the CMOS values hense they are the BIOS Setup default values F6 This will load all the Options in the Advanced CMOS Setup Advanced Chipset Setup with the BIOS Setup defaults F7 This will load all the Options in the Advanced CMOS Setup Advanced Chipset Setup with the Power On defaults WEITEK Processor WEITEK coprocessor insert in socket preset is set When not inserted in socket absent is set 3 10 BIOS SETUP External Cache Memory This function can be setup enable disable External Cache second leave cache 64 256KB Internal Cache Memory This function can be setup enable disable CPU Internal cache 8 KB Adaptor RAM Shadow Adaptor Shadow RAM address range from C8000H to EFFFFH each Block size at 16KB for enable or disable Shadow RAM There are four function that can be selected Video Video shadow C0000 C7FFFH Main Main BIOS shadow F0000 FFFFFH both Video and Main BIOS Shadow Disable Disable shadow
7. 990 U S RT 3E en CH 486 33A Manual User s TRN TO ASE RETUR PLEAS pv TECH LIBRARY 1st Edition June 1991 The information contained in this manual is subject to change without notice IBM PC XT AT PS 2 are registered trademarks of International Business Machines Corporation AMIis a trademark of American Megatrends inc 486 is a trademark of Intel Corporation Other brand and product name or trademarks and or registered trademarks of respective companies Table Of Contents 1 Introduction 2 Hardware Description 21 System Description 2 2 Connector and Jumper Settings 2 3 DRAM Bank Configuration 2 4 SRAM Configuration 3 BIOS Setup 34 BIOS Overview 3 2 Standard CMOS Setup 3 3 Advanced CMOS Setup 3 4 Advanced Chipset Setup 3 5 Auto Configuration with BIOS Defaults 3 6 Auto Configuration with Power On Defaults 3 7 Write To CMOS and Exit 38 Do Not Write To CMOS and Exit 1 Introduction The CH 486 33A is a three chip solution offering optional performance for high end 486 based AT systems The CH 486 33A is designed for INTEL 80486DX running 33 MHz or INTEL 80486SX running for 20 25MHz combines three major functions n The 82C493 System Controller sysc n The 82C392 Data Buffer Contrdler DBC n The 82C206 Integrated Peripheral Controller IPC l I CH 486 33A Mainboard Specification a 33 MHz INTEL 80486 DX CPU OR 20 25 MHz INTEL 80486 SX CPU a ISA architect
8. Help 2 F3 Color F5 Old Values F6 BIOS Setup Defaults F7 Power On Defaults BIOS SETUP 3 13 Non Cacheable Block Size This setup for set Non Cacheable block size of 64 128 256 5 12K Disable Non Cacheable Block Base This setup for set Non Cacheable Block Starting address for example if a 512KB non cacheable block is selected its starting address is a multiple of 512KB Cacheable RAM Address Range This Cacheable DRAM size you can select from range 1 64MB Video BIOS Area Cacheable Enable or Disable Video BIOS Cacheable Please check your VGA card If OAK VGA card slow speed this function must disable 3 1 4 BIOS SETUP 3 5 AUTO CONFIGURATION WITH BIOS DEFAULTS When you enter AUTO CONFIGURATION WITH BIOS DEFAULTS the screen will be as follows BIOS SETUP PROGRAM AMI BIOS SETUP UTILITIES C 1990 American Megatrends Inc All Rights Reserved STANDARD CMOS SETUP ADVANCED CMOS SETUP AUTO CONFIGURATION WITH BIOS DEFAULTS AUTO CONFIGURATION WITH POWER ON DEFAULTS Load BIOS Setup Default Values from ROM Table Y N 2 N Load BIOS Setup Defaullt Values for Advanced CMOS and Advanced CHIPSET Setup ESC Exit Sel F2 F3 Color F10 Save amp Exit Press Y or N to change ADVANCED CMOS SETUP and ADVANCED CHIPSET SETUP with BIOS default values Note The BIOS default values setup chipset register for mainboard running high performance BIOS SETUP
9. LTS AUTO CONFIGURATION WITH POWER ON DEFAULTS 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 Sel F2 F3 Color F10 Save amp Exit L eres Explanation of keys ESC Exit to setup program Arrow keys Cursor movement F2 F3 Change Color F10 Save Setup values amp Exit to setup program BIOS SETUP 3 3 The user is given a warning message before he is allowed to change any of the setup parameters The warning message is shown as following l BIOS SETUP PROGRAM WARNING INFORMATION 1990 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 Figure 3 BIOS Setup Warning Message Explanation of keys Esc Exit to previous screen Any keys Continue choose setup program 3 4 BIOS SETUP 3 2 STANDARD CMOS SETUP This option is used to configure the following options so W o D e E e BIOS SETUP Date Month Date and Year Time Hour Minute and Second Daylight Saving Disabled or Enabled Hard Disk C and Hard Disk D The user can choose any of the st
10. andard hard disk types from 1 to 46 or he can choose type 47 which is the user defineable type The user must enter the hard disk parameters if he wants to choose the user definable hard disk type per drive i e type 47 may be different for drive C and for drive D Floppy drive A and Floppy drive B 360KB 5 25 1 2MB 5 25 720KB 3 5 1 44MB 3 5 Not Installed Primary Display Monochrome Color 40 x 25 VGA PGA EGA Color 80x25 Not Installed Keyboard Installed or Not Installed BIOS SETUP PROGRAM STANDARD CMOS SETUP C 1990 American Megatrends Inc All Rights Reserved Date mm date year Wed Jun 05 1991 Base memory 640 KB lime hour min sec 5 35 50 Ext memory 7168 KB Daylight saving Disabled Cyln Head WPcom LZone Sect Size Hard disk C type Not Installed Hard disk D type Not Installed Floppy drive A 1 2 MB 5 25 Floppy drive B Not Installed Primary display VGA PGA EGA Key board Installed Month Jan Feb Dec Date 01 02 03 31 Year 1901 1902 2099 ESC Exit f Select F2 F3 Color PU PD Modify 3 6 BIOS SETUP Note Daylight Saving The RTC has a built in capability to automatically adjust the time on the two daylight savings days of the year If this is desired set the field to Enable Otherwise set field to Disabled Note that in general nothing will be immediately observable by setting the field to
11. ble Short Color Open Monochrome JP2 CMOS power 1 2 Clear CMOS RAM 2 3 Backup CMOS RAM JP4 JP5 CPU selectable CPU selectable 1 2 486 DX 4875X _ 7 486 SX CPU selectable Short 486 DX 487SX Open 486 SX Cache size selectable Short 256K Open 64K JP9 Cache size selectable Short 256K Open 64K JP11 Cache size selectable Short 256K Open 64K NOTE 1 Those enclosed in box are Mainboard Default 2 This Mainboard only support Intel C later stepping of processor Hardware Description 2 5 2 3 DRAM Bank Configuration The CH 486 33A supports 2 banks of page mode local memory DRAM devices are either 256Kb 1Mb or 4Mb large Total memory is between 1MB and 32MB The following table illustrates the configuration supported Bank 1 Use 80ns DRAM 2 6 Hardware Description 2 4 SRAM Configuration The CH 486 33A has a non pipeline mode with a 16 bytes line size copy back Direct mapped cache because this cache controller design two way interleave cache read write so only support 64K or 256K secondary cache size The following table shows the TAG RAM size cache RAM size and cacheable main memory size supported by CH 486 33A Cache size KB TAG RAM size Cache Cacheable main RAM size memory 8K x 8bit U34 8K x 8bit 16MB 64K x 1bit U33 u47 U49 U51 U55 32K x 8bit U34 32K x 8bit 64K x
12. ure Copy Back Direct Mapped Cache with size of 64KB or 256 KB selectable Up to 32 MB of local high speed page mode DRAM memory space DRAM TYPE support 256K 1M 4MB Control of two non cacheable regions Shadow RAM support Optional Cacheable of shadow video BIOS Turbo slow speed selectable for hardware and software controller bef a annann Introduction WEITEK 4167 coprocessor socket on board On board rechargeable battery back up for CMOS configuration and real time dock Optimized for OS 2 window 386 window 3 0 XENIX UNIX software operation Baby AT size with XT AT mounting hole Introduction 2 Hardware Description 2 1 System Description 80486 Microprocessor The 80486 is a high performance 32 bit microprocessor with on chip memory management floating point and cache memory units It is binary compatible with members of the 86 architectural family The 486 CPU contains all the features of the 386 CPU with enhancements to increase performance On chip Floating Point Control Unit The operation of the 486 microprocessor s on chip floating point control unit is exactly the same as the 387 math coprocessor Software written for the 387 math coprocessor will run on the on chip floating point unit without any modification It occupies I O address range of 800000FOH 800000FFH and operates in parallel with the arithmetic and logic unit and provides arithmetic instructions for a variety of numeric data types
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