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Mylex MGI486 User Manual

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MGI486 System Board
User's Guide
P/N: 771924
Version: D03
March 1995

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Summary of Contents for Mylex MGI486

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

  • Page 2: Manual Notice

    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, translated on paper, electronic media or computer- readable-form or be used to make a derivative work without written permission from Mylex Corporation, except as permitted by the United States Copyright Act of 1976, as amended.

  • Page 3: Fcc Warning

    Finally, any changes or modifications to the equipment by the user not expressly approved by the guarantee or manufacturer could void the users's authority to operate such equipment. Trademarks: Mylex and MGI486 are registered trademarks of Mylex Corporation. All other products and companies are trademarks of their respective owners and licensees.
  • Page 4 This product is guaranteed to be free from manufacturing or material defects for a period of 1 (one) year after the date of purchase. Should the product fail during this period, Mylex will repair or replace (at Mylex's option) the product free of charge with the following provisions: Proof of purchase must be provided.
  • Page 5 Customer Service Policy Returned Merchandise Authorization (RMA) All products returned to Mylex for warranty service or for other reasons must be assigned an RMA number before shipment to Mylex. The RMA number may be obtained by contacting Mylex's Technical Support Department. Any product received without an RMA number will be returned to the shipper unopened.

  • Page 6: Handling Precautions

    The MGI486 has delicate crystal oscillators that can break if subjected to sudden shock such as being tossed on a table. Use care when moving the MGI486 from point to point. If Troubles Are Encountered...
  • Page 7 Contents 1 – Introduction About This User's Guide The Green PC Function Specifications 2 – System Board Setup System Board Jumpers CPU Type CPU Voltage CPU Clock (JP5, JP6, JP7) Power Management Mode Control (JP13) VESA Bus Wait State (JP15) VESA Bus Clock (JP16) Clear CMOS Data (JP11) System Board Connectors...
  • Page 8 3 – Memory Configuration Main Memory Cache Memory3-5 4 – BIOS Setup Entering Setup Standard CMOS Setup BIOS Features Setup Virus Protection Cache Control Boot Up Features IDE HDD Block Mode Typematic Rate Setting Password Control System BIOS Shadow Chipset Features Setup Power Management Setup Power Management Disabled Mode...
  • Page 9 Chapter 1 Introduction About This User's Guide This User's Guide is arranged to help you set up and run the MGI486 system board. • Chapter 1, Introduction, describes the functions and features of the system board and specifications. • Chapter 2, System Board Setup, includes detailed information on how to install and configure the MGI486 system board.
  • Page 10 MGI486 System Board User's Guide • NORMAL mode: This mode is the normal operation of the PC system. In this mode, the doze timer starts counting if no activity is taking place and the programmable time-out period has expired. • DOZE mode: In this mode, the CPU clock frequency is slowed to one-half the normal frequency.

  • Page 11: Specifications

    Introduction Specifications CPU: Intel i486SX/DX/DX2/DX4/SL-Enhanced/OverDrive, P24D (486DX Write Back) AMD Am486DX/DX2/DX4 Cyrix Cx486DX/DX2(M7)/DX2V UMC U5S Optional 239-pin PGA or 237-pin ZIF CPU socket System Clock: 25/33/40/50MHz Main Memory: Maximum 64MB on board 30-pin SIMM x 4 (256KB, 1MB, 4MB, 16MB; 9-bit SIMMs are acceptable) 72-pin SIMM x 2 (1MB, 2MB, 4MB, 8MB, 16MB;...
  • Page 12 MGI486 System Board User's Guide The following table defines the jumpers and connectors on the MGI486 system board. The configuration and options available for each of them are described in Chapter 2. Jumpers & Connectors Function Ref. Page System Management Output (SMOUT)

  • Page 13: System Board Jumpers

    System Board Setup This chapter describes the individual jumpers and connectors switches on the MGI486 system board. If your system board has already been installed by the dealer, you should refer to this chapter if you plan to make any changes or upgrade your system.
  • Page 14 MGI486 System Board User's Guide Figure 2-1 illustrates the jumper pins and cap, and the schematic equivalent. Figure 2-1. Jumper Pin Configuration 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.

  • Page 15: Cpu Voltage

    System Board Setup 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 JP17 JP18 JP21 JP22 JP23 JP27 JP28 RP Sel U5S; 486SX; SL- Open Open Open RP5-RP31...
  • Page 16 MGI486 System Board User's Guide CPU Clock (JP5, JP6, JP7) The system board is fitted with a clock generator that allows you to choose a different CPU frequency simply by changing the jumper settings. The following clock frequencies apply to the listed CPU type: CPU Type CPU Clock Freq.
  • Page 17 System Board Setup into the Suspend mode. This will reduce the CPU clock to zero MHz and power down the external cache. The system can be resumed by again pressing the power saving control switch or by using the auto-wake-up feature (pressing any key or moving the mouse).

  • Page 18: System Board Connectors

    MGI486 System Board User's Guide System Board Connectors The following connectors are used to interface the system board with peripheral control and system management devices. Power Connector (CN2) Most power supplies have two 6-wire plugs that must be connected to the system board.
  • Page 19 System Board Setup Keyboard (CN1) CN1 is a 5-pin DIN connector that interfaces the keyboard to the system board. CN1- Description Keyboard Clock Keyboard Data No Connection Ground +5Vdc Keyboard Lock Switch and Power-On LED (J2) The J2 connector interfaces to a key switch on the front panel of the system case.
  • Page 20 MGI486 System Board User's Guide Speaker (J3) An external speaker mounted inside the case can be interfaced to the system board through the J3 connector. Pin 1 is located at the top when viewing the board as shown in the Quick Reference at the end of this chapter.
  • Page 21 System Board Setup System Reset Switch (J5) The J5 connector interfaces the system reset switch on the front panel of the case. The switch causes the system board to perform a cold start from the power-on self test without turning off power to components, such as the hard disk drive.
  • Page 22 MGI486 System Board User's Guide System Management Output Port (J1) The four 2-pin ports at J1 provide an alternative way for peripherals to enter into System Management mode. Plug the connecting cables from peripherals capable of power management mode into any pair of the four J1 SMOUT ports (SM0, SM1, SM2, and SM3).

  • Page 24: Memory Configuration

    Chapter 3 Memory Configuration 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. Figure 3-1. Main Memory SIMM Slots Manual No. 771924-D03, Mar. 1995...
  • Page 25 MGI486 System Board User's Guide The system board cannot auto size until the configuration is correctly set. Configure the RP7 - RP10 Jumpers before installing the SIMMs. Refer to the tables on the following pages for the proper settings. SIMM A (30 Pins)
  • Page 26 Memory Configuration Condition 2: Only SIMM B is installed with single-sided SIMMs SIMM A SIMM B Size RP Sel SIMM 1 - 4 SIMM 5 SIMM 6 Short None 1MB x 1 None None 1MB x 1 1MB x 1 None 4MB x 1 None...
  • Page 27 MGI486 System Board User's Guide Condition 4: SIMM A and SIMM B are installed at same time and SIMM B is dedicated in single-sided SIMMS SIMM A SIMM B Size RP Sel SIMM 1 - 4 SIMM 5 SIMM 6...

  • Page 28: Cache Memory

    Memory Configuration Cache Memory Cache memory requires installation of a tag RAM device in U10 followed by an arrangement of additional devices listed in the table below. Figure 3-2 illustrates the physical cache memory layout. Figure 3-2. Cache Memory Layout Cache Memory Tag RAM RP Sel...
  • Page 29 MGI486 System Board User's Guide Manual No. 771924-D03, Mar. 1995...

  • Page 30: Bios Setup

    Chapter 4 BIOS Setup Award's BIOS ROM has a setup program that allows you to modify your basic system configuration. The BIOS data are stored in CMOS RAM so that the setup configuration will be retained when the power is turned off.

  • Page 31: Standard Cmos Setup

    MGI486 System Board User's Guide Standard CMOS Setup Choose the Standard CMOS Setup option from the CMOS Setup Utility menu. The menu in Figure 3-2 allows you to configure date, time, hard disk drive, floppy disk drive, display and memory. When a field is highlighted, on-line help information is displayed in the left bottom of the Menu screen.

  • Page 32: Bios Features Setup

    BIOS Setup • Large - for drives larger than 528MB that do not use LBA mode. The Large mode is a new specification which may not be fully supported by all operation systems. Presently, it can only be used with MS-DOS. BIOS Features Setup Select the BIOS Features Setup option from the CMOS Setup Utility menu to display the screen in Figure 3-3.

  • Page 33: Cache Control

    MGI486 System Board User's Guide and cause a warning message to appear. If this happens, you can either allow the operation to continue or stop it. Cache Control CPU Internal Cache: Disabled Enabled External Cache: Disabled Enabled Boot Up Features Boot Sequence: This selects the drive for the system to search first for boot data.
  • Page 34 BIOS Setup IDE HDD Block Mode Disabled Enabled This feature enhances hard disk performance by making multi-sector transfers instead of one sector per transfer. Most IDE drives, except very early designs, can use this feature. Make sure your hard disk drive is compatible before enabling this selection to prevent loss of data on the drive.
  • Page 35 MGI486 System Board User's Guide System BIOS Shadow Video BIOS Shadow: Disabled Enabled Enables the system shadow to achieve 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 Manual No.

  • Page 36: Chipset Features Setup

    BIOS Setup Chipset Features Setup Choose Chipset Features Setup from the CMOS Setup Utility menu to display the screen in Figure 3-4. This sample screen contains the manufacturer's default values for the system board. ROM ISA BIOS (2A4I9C31) CHIPSET FEATURES SETUP AWARD SOFTWARE, INC.

  • Page 37: Power Management Setup

    MGI486 System Board User's Guide Power Management Setup Choose Power Management Setup from the CMOS Setup Utility menu to display the screen in Figure 3-5. This menu provides the Green PC power management features. ROM ISA BIOS (2A4I9C31) POWER MANAGEMENT SETUP AWARD SOFTWARE, INC.
  • Page 38 BIOS Setup ROM ISA BIOS (2A4I9C31) POWER MANAGEMENT SETUP AWARD SOFTWARE, INC. Power Management : User Define IRQ3 (COM2) : Enabled PM Control by APM : Yes IRQ4 (COM1) : Enabled Video Off Option : Susp,Stby-> Off IRQ5 (LPT or LAN) : Enabled **PM Timers** IRQ6...
  • Page 39 MGI486 System Board User's Guide Max. Saving When you select this mode, you will be presented the system default values of four related timers (HDD power Down Timer at 1 Min; system Doze Timer at 10 Sec;, system Standby Timer at 10 Sec, and system Suspend Timer at 10 Sec) to facilitate the minimized power management function.
  • Page 40 BIOS Setup System Standby Timer The Suspend timer starts counting at the end of each activity. If there's no further activity during the defined period, the system will scale the CPU and system clock at the lower frequency (8MHz) and motivate the enabled PM Events.
  • Page 41 MGI486 System Board User's Guide Monitor Events in Full-On Mode PM Events include: • Local Master • Local Device • Video Activities • DMA Activities • IRQ1 through IRQ15 The IRQ8 (RTC, OS2) default setting is disabled in order to make sure that the Power Management mode can be executed under OS2.
  • Page 42 BIOS Setup Video Off Suspend → Off Always On Susp, Stby → Off All Modes → Off Always On The monitor will not enter the PM mode under any circumstance.. Suspend → Off Screen will turn off after the Suspend timer times out. Susp, Stby →...

  • Page 43: Load Setup Defaults

    MGI486 System Board User's Guide Load Setup Defaults Select the Load Setup Defaults option from the CMOS Setup Utility menu to configure the BIOS to load the system defaults directly from CMOS. If the configured setup record created by the Setup program becomes corrupted (and therefore unusable), the system defaults will be loaded automatically when you turn the computer on.

  • Page 44: Ide Hdd Auto Detection

    BIOS Setup IDE HDD Auto Detection This utility automatically detects the IDE hard disk drive type; use this to confirm your hard disk data when it is unknown. Select the IDE HDD Auto Detection from the CMOS Setup Utility menu. Upon detection, the HDD type and peripheral data will be displayed.

  • Page 45: Save And Exit Setup

    MGI486 System Board User's Guide Save and Exit Setup Select this option from the CMOS Setup Utility after you have completed your BIOS setup and want to save all changes. Press Enter after selecting the option and all changes will be written in the CMOS memory of the chipset.

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