Mylex MGI486 User Manual Download

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CPU Type

The following table lists the proper jumper settings of JP3, JP17, JP18,
JP21-JP24, JP27, JP28, RP3~6 and RP30~31 for different CPU models.

CPU Type

JP3

JP17

JP18 JP21

JP22

JP23

JP27

JP28

RP Sel

U5S; 486SX; SL-
Enhanced

2-3

1-2

Open

1-2

Open Open

RP5-RP31

486DX/DX2

2-3

1-2

Open

1-2

Open Open

RP3-RP31

486DX/DX2/DX4/
SL-Enhanced

2-3

1-2

Open

1-2

Open Open

RP3-RP31

486 OverDrive

2-3

1-2

Open

2-3

Open Open

RP3-RP31

P24D (486DX
Write Back)

1-2

2-3

1-2

Open

1-2

2-3

Short

RP4-RP6

Cyrix M7 (5V)

1-2

Open Open

RP3-RP30

Cyrix DX2V-66/80
(4V)

1-2

Open Open

RP3-RP30

AMD
486DXL/DXL2

2-3

Open

1-2

Open

RP3-RP31

AMD 486/DX4

2-3

Open

1-2

Open Open

RP3-RP31

P4S and ODPR486 map to 486DX/DX2/P24S CPU model jumper
settings.

CPU Voltage

Set jumpers JP1, JP2, JP4, and JP24 as shown below for the correct type
of CPU used (see also JP24 in the CPU Type table above).

CPU Type

JP1

JP2

JP4

JP24

3.3V CPU, such as Intel and
AMD DX2/DX4

Open

1-2

4.0V CPU such as Cyrix DX2V

Open

2-3

5.0 V CPU (default)

Short

1-2

Manual No. 771924-D03, Mar. 1995

2-3

System Board Setup

Summary of Contents for MGI486

Page 1: ...MGI486 System Board User s Guide P N 771924 Version D03 March 1995 ...

Page 2: ... to herein including but not limited to any warranty of design merchantability or fitness for a particular purpose even if Mylex has been informed of such purpose P N 771924 Version D03 Copyright 1995 by Mylex Corporation P O Box 5035 Fremont California 94537 5035 Copyright Notice This manual is copyrighted by Mylex Corporation It may not in whole or in part be copied reproduced photocopied transl...

Page 3: ...ent is causing interference to radio or television reception the following suggestion actions may be taken Reorient or relocate the receiving antennae Increase the distance between the antennae and the computer Plug the computer into a different AC outlet so that the two conflicting devices are using a different branch circuit Contact the dealer who sold this equipment and or a reputable radio tel...

Page 4: ...ssed or implied The purchaser bears complete risk of the performance and quality of the software Mylex s sole responsibility and the purchaser s only remedy to any defect in workmanship shall be replacement of the defective medium diskette or ROM All expressed or implied warranties for the MGI486 including but not limited to warranties of merchantability and fitness for a particular purpose are re...

Page 5: ...s 2 Each returned unit will be inspected for damage or other irregularities It a unit is shown to be modified the customer will be notified before any action is taken 3 Mylex will not be responsible for non Mylex products shipped with an RMA unit This includes memory math co processors and other internal and external peripherals Products must be shipped to Mylex with freight paid Upon completion o...

Page 6: ...oving the MGI486 from point to point If Troubles Are Encountered If during the course of installation or operation of the MGI486 the board displays improper operation make sure that all components are seated tightly and configured correctly paying particular attention to the jumper settings and the BIOS setup Then contact your dealer or distributor for additional information Dealers and Distributo...

Page 7: ...wer Management Mode Control JP13 VESA Bus Wait State JP15 VESA Bus Clock JP16 Clear CMOS Data JP11 System Board Connectors Power Connector CN2 Keyboard CN1 Keyboard Lock Switch and Power On LED J2 Speaker J3 External Battery J4 System Reset Switch J5 Turbo Switch J6 Turbo LED J7 System Management Output Port J1 Power Management Green LED D4 Manual No 771924 D03 Mar 1995 V ...

Page 8: ...Mode Typematic Rate Setting Password Control System BIOS Shadow Chipset Features Setup Power Management Setup Power Management Disabled Mode Max Saving Min Saving User Define Monitor Events in Full On Mode PM Control by APM Video Off IRQ 12 15 for PM Load Setup Defaults Password Setting IDE HDD Auto Detection Save and Exit Setup Exit Without Saving VI Manual No 771924 D03 Mar 1995 ...

Page 9: ...s for installing the memory devices on the system board Chapter 4 BIOS Setup explains how to adjust the BIOS setup using the software utility after the board setup has been completed This Guide applies to the MGI486 system board Revision C The Green PC Function The Power Management Unit PMU controls and dramatically reduces overall system power consumption This is accomplished by the activity moni...

Page 10: ...and system clock to a lower frequency 8MHz and turns off the video signal to conserve power to the display monitor SUSPEND mode In this mode the PMU stops the CPU clock slows down the system clock and powers down the external cache The power management setup is described under BIOS Setup in Chapter 3 A Quick Reference diagram showing the location and configuration of all jumpers and connectors is ...

Page 11: ...t SIMMs are acceptable Cache Memory Maximum 64MB on board 64K 128K 256K 512K 8K x 8 32K x 8 64K x 8 DIP I O Slots ISA bus 16 bit x 6 8 bit x 1 VESA Local bus x 3 Master mode x 2 one is in VESA 2 another is either in VESA 1 or VESA 3 It will auto detect and switch by itself without the need to set any of the jumpers Shadow Ram System BIOS Video BIOS and Adapter ROM BIOS Award Green PC Meets EPA Gre...

Page 12: ...1 JP2 JP4 JP24 CPU Power Voltage Setting Jumpers 2 3 JP3 JP17 JP18 JP21 JP22 JP23 JP27 JP28 RP3 6 RP30 31 CPU Type Setting Jumpers 2 3 JP5 JP7 System Clock Setting Jumpers 2 4 JP9 JP20 RP15 RP19 Cache Size Selection Jumpers 3 5 JP11 CMOS Data Clear Jumper 2 5 JP13 Power Saving Green Switch Connector 2 4 JP15 VESA Bus Wait State Setting Jumper 2 5 JP16 VESA Bus Clock Setting Jumper 2 5 RP7 RP10 Mai...

Page 13: ...jumper cap over two pins connects those pins and makes a particular selection If the cap is not placed over two pins the pins are open and a connection is not made This is the general method for storing jumpers when a connection is not required For all of the following jumpers 1 2 indicates that a jumper is to be installed between pins 1 and 2 pin 1 is identified only on connectors with 3 or more ...

Page 14: ...ematic equivalent A Quick Reference to the location and configuration of all connectors and jumpers is provided on a fold out page at the end of this chapter 2 2 Manual No 771924 D03 Mar 1995 MGI486 System Board User s Guide Figure 2 1 Jumper Pin Configuration ...

Page 15: ... Open 1 2 2 3 Short RP4 RP6 Cyrix M7 5V 1 2 1 2 1 2 1 2 1 2 1 2 Open Open RP3 RP30 Cyrix DX2V 66 80 4V 1 2 1 2 1 2 1 2 1 2 1 2 Open Open RP3 RP30 AMD 486DXL DXL2 2 3 2 3 2 3 2 3 Open 1 2 1 2 Open RP3 RP31 AMD 486 DX4 2 3 2 3 2 3 2 3 Open 1 2 Open Open RP3 RP31 P4S and ODPR486 map to 486DX DX2 P24S CPU model jumper settings CPU Voltage Set jumpers JP1 JP2 JP4 and JP24 as shown below for the correct...

Page 16: ...by changing the settings of JP5 JP6 and JP7 jumpers according to the above table The setup depends on installation of U6 or U7 as shown below CPU Clock MX8315 UM9515 U7 Installed IMISC466 U6 Installed JP5 JP6 JP7 JP5 JP6 JP7 25 MHz Open Open Short Open Open Open 33 MHz Short Short Short Short Short Open 40 MHz Open Short Short Open Short Open 50 MHz Short Open Open Short Open Open Power Management...

Page 17: ...or 1 Wait State for the VESA local bus JP15 Description 1 2 1 Wait State default 2 3 0 Wait State VESA Bus Clock JP16 The JP16 jumper selects the VESA local bus clock JP16 Description 1 2 33MHz 2 3 33MHz Clear CMOS Data JP11 The JP11 jumper clears the system configuration data currently stored in the CMOS RAM and reloads the default system configuration this function will be useful if you forget t...

Page 18: ... each plug Align the plugs so that the two black wires on each plug are positioned in the middle of the CN2 connector as illustrated below Before connecting to the power supply make sure it is not connected to the AC power source CN2 Description Wire Color 1 Power Good Orange 2 5V Red 3 12V Yellow 4 12V Blue 5 Ground Black 6 Ground Black 7 Ground Black 8 Ground Black 9 5V White 10 5V Red 11 5V Red...

Page 19: ... the system case Turning and removing the key will disable the keyboard to prevent other users from operating your computer when you are not present Orient the cable correctly when connecting the key switch to the main board pin 1 is located at the top when viewing the board as shown in the Quick Reference at the end of this chapter J2 Description 1 5Vdc Power On LED 2 Ground 3 Ground Power On LED...

Page 20: ... The J4 connector may be used for an external 4 5V to 6V battery to back up or replace the on board battery When connecting the external battery it is very important that the connecting wire be oriented correctly Pin 1 positive is located on the left side when viewing the board as shown in the Quick Reference at the end of this chapter J4 Description 1 Battery Positive 2 No connection 3 Battery Ne...

Page 21: ...erfaces the system board to a hardware turbo switch on the front panel of the system unit The turbo switch toggles the turbo high speed mode on or off The turbo function is disabled when the hardware switch is not connected default J6 Description Open Low speed Short High speed default Turbo LED J7 The J7 connects to an LED on the front panel of the system case to indicate the state of the turbo m...

Page 22: ...t is an active low signal When the board enters any power management mode the SMOUT will sense it and change the signal from high to low Accordingly peripherals attached to the SMOUT ports will shut down and will not restart until the board returns to Normal high mode Power Management Green LED D4 The Green LED connected to D4 indicates the power management state of the system board When in normal...

Page 23: ...System Board Setup ...

Page 24: ...figuration Main Memory Install the main memory SIMMs in the slots shown in Figure 3 1 below The possible memory configurations are shown on the next page Manual No 771924 D03 Mar 1995 3 1 Figure 3 1 Main Memory SIMM Slots ...

Page 25: ...72 pin RP8 Shorted Not Installed Double side 72 pin Double side 72 pin RP7 Shorted Installed Single side 72 pin Single side 72 pin RP10 Shorted Installed Double side 72 pin Single side 72 pin RP9 Shorted All possible main memory configurations and jumper settings mapping are shown in the following tables Condition 1 Only SIMM A is installed Size SIMM A SIMM B RP Sel Short SIMM 1 4 SIMM 5 SIMM 6 1 ...

Page 26: ... 6 16MB None 16MB x 1 None 7 20MB None 4MB x 1 16MB x 1 8 32MB None 16MB x 1 16MB x 1 Condition 3 Only SIMM B is installed with double sided SIMMs Size SIMM A SIMM B RP Sel Short SIMM 1 4 SIMM 5 SIMM 6 1 2MB None 2MB x 1 None RP7 2 8MB None 8MB x 1 None 3 10MB None 2MB x 1 8MB x 1 4 16MB None 8MB x 1 8MB x 1 5 32MB None 32MB x 1 None 6 40MB None 8MB x 1 32MB x 1 7 64MB None 32MB x 1 32MB x 1 Manua...

Page 27: ...9 16MB x 1 None 8 24MB 1MB x 9 4MB x 1 16MB x 1 9 36MB 1MB x 9 16MB x 1 16MB x 1 10 32MB 4MB x 9 16MB x 1 None 11 48MB 4MB x 9 16MB x 1 16MB x 1 Condition 5 SIMM A and SIMM B are installed at same time SIMM 5 is dedicated in double sided SIMMs SIMM 6 is dedicated in single side SIMMs Size SIMM A SIMM B RP Sel Short SIMM 1 4 SIMM 5 SIMM 6 1 12MB 1MB x 9 8MB x 1 None RP9 2 16MB 1MB x 9 8MB x 1 4MB x...

Page 28: ... Size Tag RAM U10 Data RAM JP9 JP20 RP Sel Short 64KB 8K x 8 1 pc 8K x 8 8 pcs U11 U18 1 2 1 2 RP15 128KB 8K x 8 1 pc 32K x 8 4 pcs U11 U14 2 3 1 2 RP16 256KB 32K x 8 or 16K x 8 1PC 32K x 8 8 pcs U11 U18 2 3 1 2 RP17 256KB 32K x 8 or 16K x 8 1PC 64K x 8 4 pcs U11 U14 2 3 1 2 RP18 512KB 32K x 8 1 pc 64K x 8 8 pcs U11 U18 2 3 2 3 RP19 Manual No 771924 D03 Mar 1995 3 5 Memory Configuration Figure 3 2...

Page 29: ...3 6 Manual No 771924 D03 Mar 1995 MGI486 System Board User s Guide ...

Page 30: ...date or time etc Entering Setup Power on the computer and press Del immediately to enter the Setup program The CMOS Setup Utility Initial menu is shown in Figure 3 1 ROM ISA BIOS 2A4I9C31 CMOS SETUP UTILITY AWARD SOFTWARE INC STANDARD CMOS SETUP BIOS FEATURES SETUP CHIPSET FEATURES SETUP POWER MANAGEMENT SETUP LOAD SETUP DEFAULTS PASSWORD SETTING IDE HDD AUTO DETECTION SAVE EXIT SETUP EXIT WITHOUT...

Page 31: ...5 in Drive B None PreComp LandZone Sector Mode 0 0 0 0 0 0 Video EGA VGA Halt On All Errors Base Memory 640K Extended Memory 7168K Expanded Memory 0K Other Memory 385K Total 8192K Esc Quit Select Item PU PD Modify F1 Help Shift F2 Change Color Specifications for hard disk drives such as MFM ESDI or IDE must be recorded here SCSI drives operate with device drivers and are not supported directly by ...

Page 32: ...Enabled External Cache Enabled Boot Sequence A C Swap Floppy Drive Disabled Boot Up Floppy Seek Enabled Boot Up NumLock Status On Boot Up System Speed Low IDE HDD Block Mode Disabled Video BIOS Shadow Enabled C8000 CFFFFShadow Disabled D0000 D7FFFShadow Disabled D8000 DFFFFShadow Disabled Typematic Rate Setting Disabled Typematic Rate Chars Sec 6 Typematic Delay 250 Security Option Setup Esc Quit ...

Page 33: ...swaps the floppy drive assignment so that drive A will function as drive B and drive B will function as drive A Boot Up Floppy Seek Disabled Enabled During POST Procedure the BIOS will determine if the installed floppy disk drive is 40 or 80 tracks 360KB is 40 tracks 760KB 1 2MB and 1 44MB are all 80 tracks If this function is enabled there will be a warning message when a 360K floppy drive is ins...

Page 34: ...sed Typematic Rate Chars Sec The values are 2 6 and 30 characters per second Typematic Delay key repeat rate The values are 250 500 700 and 1000 milliseconds Password Control Security Option System Setup System The system will not boot and access to setup will be denied if the correct password is not entered at the prompt Setup The system will boot but access to setup will be denied if the correct...

Page 35: ...chieve the best performance of the system Shadow Disabled Enabled C8000 CFFFF D0000 D7FFF D8000 DFFFF If you shadow the BIOS at any of the above segments you may set the appropriate memory cacheable function to Enabled 4 6 Manual No 771924 D03 Mar 1995 MGI486 System Board User s Guide ...

Page 36: ...T DRAM Burst Read 2T Cache Write Cycle 2T System Shadow Non cacheable Video Shadow Non Cacheable Esc Quit Select Item F1 Help PU PD Modify F5 Old Values Shift F2 Color F6 Load BIOS Defaults F7 Load Setup Defaults By enabling Auto Configuration the BIOS will automatically detect the CPU speed and auto configure the bus frequency DRAM speed cache and read write cycle All the entries shown in this me...

Page 37: ... Min PM Events Local Master Enable Local Device Enable Video Activities Enable DMA Activities Enable IRQ 1 Keyboard Enable IRQ3 COM2 Enabled IRQ4 COM1 Enabled IRQ5 LPT or LAN Enabled IRQ6 Floppy Disk Enabled IRQ7 LPT or LAN Enabled IRQ8 RTC OS2 Disabled IRQ9 Reserved Enabled IRQ10 Reserved Enabled IRQ11 Reserved Enabled IRQ12 PS 2 Mouse Enabled IRQ13 387 Enabled IRQ14 Hard Disk Enabled IRQ15 Reser...

Page 38: ...nabled IRQ7 LPT or LAN Enabled IRQ8 RTC OS2 Disabled IRQ9 Reserved Enabled IRQ10 Reserved Enabled IRQ11 Reserved Enabled IRQ12 PS 2 Mouse Enabled IRQ13 387 Enabled IRQ14 Hard Disk Enabled IRQ15 Reserved Enabled Esc Quit Select Item F1 Help PU PD Modify F5 Old Values Shift F2 Color F6 Load BIOS Defaults F7 Load Setup Defaults Power Management The four optional power Management Modes are set by pres...

Page 39: ...lowing four related timers HDD Off Timer The entry period of this flexible HDD Off timer is 1 to 15 minutes Once the system stops reading from or writing to the HDD the standby timer starts counting If there is no activity and the defined timeout period expires the system will shut off the HDD power The HDD will not resume its function until a read write command is executed Doze Timer select The D...

Page 40: ...y or move the mouse The range of the Suspend mode timer is 10 seconds to 3 hours System Suspend Timer The Suspend timer will be functional only if your system uses the Intel SL Enhanced series CPU The Suspend timer starts counting at the end of each activity If there s no further activity during the defined period the system will shut off the CPU HDD and monitor power to enter the Suspend mode The...

Page 41: ...ting of IRQ 8 RTC OS2 event is Disable in order to make sure the Power Management mode can be executed under OS2 You can define a personalized combination of PM Events by selecting Enable which will be checked to determine if the related function is still working before the defined power management mode is asked to be motivated PM Control by APM Yes No If APM Advanced Power Management is installed...

Page 42: ...imes out All Modes Off The monitor will enter the defined PM mode with a blank screen after the respective timer times out IRQ 12 15 for PM This option will be available only for Intel non SL Enhanced series CPU s IRQ 12 and IRQ 15 are available for PM functions but the selection for this implementation is based on the I O environment of installed systems The match is detailed as follows I O IRQ P...

Page 43: ...n you want to change or delete an existing password When you use this option to initially set a password you will be prompted to Enter Password Press Enter this is the ROM default password and continue to set up the initial password At other times the prompt will require the valid password to be entered After the ROM password Enter or valid password has been entered you can either accept the exist...

Page 44: ...ll be displayed Enter this information in the Standard CMOS Setup menu ROM PCI ISA BIOS 2A4IBC31 IDE HDD AUTO DETECTION AWARD SOFTWARE INC Cyls Heads Drive C 124Mb 936 16 Drive D 0Mb 0 0 Precomp Landzone Sector Mode 65535 935 17 Normal 0 0 0 Select Secondary Slave Option N Skip N Options Size CYLS Heads PreComp LandZone Sector Mode 1 Y 124Mb 936 16 65535 936 17 Normal ESC Skip Manual No 771924 D03...

Page 45: ...r system and compare it to what it finds in the system You can alternately press the F10 key to select this option without highlighting it in the menu Press Esc after selecting this option and you do not want to save exit The initial screen will again display for you to select the option of your choice Exit Without Saving Select this option from the CMOS Setup Utility and press Enter to exit the S...

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