GMB-486SG High Performance 486 VLB Motherboard User’s Manual For GMB-486sg v2 Manual Edition 6.
This guide contains instructions for configuring and installing the mainboard. • Chapter 1, Introduction, acquaints user with the special features of the mainboard. • Chapter 2, Hardware Configuration, gives information on configuring memory and setting the mainboard's jumpers. Brief sections on installing memory. • Chapter 3, Mainboard Installation, is an overview of how to install the mainboard in a system. • Chapter 4, BIOS Setup, provides the BIOS information for system configuration.
UNPACKING THE MAINBOARD The Mainboard comes packed in a sturdy cardboard shipping carton. The carton contains: • The Mainboard • This User's Guide Note: Do not remove the mainboard from its original packing until ready to install. The mainboard is easily damaged by static electricity. Observe the following precautions while unpacking and installing the mainboard. 1. Touch an unpainted area of the system chassis before handling the mainboard or any component.
CONTENTS CHAPTER 1 1.1 1.2 1.3 INTRODUCTION KEY FEATURES MAINBOARD COMPONENTS VESA LOCAL BUS SPECIAL FEATURES CHAPTER 2 2.1 2.2 HARDWARE CONFIGURATION 5 JUMPER AND MEMORY BANK LOCATIONS 5 JP8, JP10-JP15, JP21, JP22, JP24, JP25, JP30, JP31, JP34-JP36, JP38 - CPU TYPE CONFIGURATION 6 CPU INSTALLATION 14 CACHE CONFIGURATION 15 2.4.1 UPGRADING CACHE 15 2.4.2 CACHE SIZE AND MEMORY LOCATIONS 16 2.4.3 CACHE CHIP SOCKETS AND JUMPER LOCATIONS16 2.4.4 JP1-JP4, JP33 - CACHE & TAG RAM JUMPER SETTING 17 2.4.
4.4.2 4.4.3 4.4.4 4.4.5 4.4.6 4.4.7 4.4.8 4.4.9 4.4.10 CHAPTER 5 5.1 5.
Introduction CHAPTER 1 INTRODUCTION The mainboard is a 2/3 body AT size high-performance mainboard that provides with basic elements on which to build an advanced computer. The mainboard running from 25MHz to 133MHz, supports Normal 486 CPUs, Intel's SL-Enhanced 486, Cyrix Cx486S/DX/DX2, UMC U5SX-486, P24D/P24T; and optionally support P24C(486DX4), Am486DX2/DX4(3.45V), Enhanced Am486DX2/DX4 (3.45V), Cx486DX2V66/V80, Cyrix DX4-100, Cx5x86-100, TI DX2-80, IBM486-4V3100GC/GIC and AMD-X5-133ADW CPUs. 1.
Chapter 1 • Hidden DRAM refresh support. • Support KB control Turbo/Deturbo mode select. • Support 7 Direct Memory Access channels and 16 Interrupt levels. • Three 16-bit I/O slots, one 8-bit I/O slots, and three Standard VESA Local Bus master slot. • Battery backup for CMOS configuration and real time clock/calendar. • 8MHz AT Bus clock & speed changeable by hardware or keyboard, CPU clock adjustable by jumper. • 2/3 Baby AT board size = 220mm(W) X 250mm(L).
Introduction 1.2 MAINBOARD COMPONENTS This section gives a brief description of key components on the mainboard. Refer to Fig 1 for component locations.
Chapter 1 1.3 VESA LOCAL BUS SPECIAL FEATURES • Three-bus master are supported on the VESA Local-Bus. The VESA Local-Bus connector type is a standard 32-bit Micro Channel type connector, and is located inline with a system I/O bus connector. • Three slots are provided on the mainboard. Either with one master or three master slots. • The VESA Local-Bus can support high speed video controllers, and other peripherals, such as hard disk controllers, LAN adapters, and so on.
Hardware Configuration CHAPTER 2 HARDWARE CONFIGURATION This chapter describes how to set the mainboard jumpers for cache memory and display type, and how to install memory modules. Before beginning the configuration, user should take the following precautions: • Turn off the power supply, and unplug the power cord before begin. • Unplug all cables that connect the mainboard to any external devices. 2.
Chapter 2 2.2 JP8, JP10-JP15, JP21, JP22, JP24, JP25, JP30, JP31, JP34-JP36, JP38 - CPU TYPE CONFIGURATION The mainboard can support processor at different speed. Various jumpers are required to setup for installing different CPU.
Hardware Configuration Table 1C: CPU Type: - P24C (DX4) (OPTIONAL) Table 1D: CPU Type: - 486SX/SLE 486SX 7
Chapter 2 Table 1E: CPU Type: - 486DX/DX2, SLE 486DX/DX2 Table 1F: CPU Type: - Cyrix 486S 8
Hardware Configuration Table 1G: CPU Type: - Cyrix 486DX/DX2 Table 1H: CPU Type: - UMC U5SX-486 9
Chapter 2 Table 1I: CPU Type: - Enhanced Am486DX2/DX4 (3.45V) (A80486DX2-XXSV8B/A80486DX4-1XXSV8B) For DX4-100 CPU Frequency: 33MHz For DX4-120 CPU Frequency: 40MHz Table 1J: CPU Type: - Am486DX2 (3.
Hardware Configuration Table 1K: CPU Type: - Am486DX4 (3.45V) (Optional) Table 1L: CPU Type: - Cx486DX2-V66 (3.
Chapter 2 Table 1M: CPU Type: - Cx486DX2-V80 (4.0V) (Optional) Table 1N: CPU Type: - Cx5x86/IBM 486-4V3100GIC (3.
Hardware Configuration Table 1O: CPU Type: - Cx486DX4-100/TI486DX2-80/ IBM 486-4V3100GC (3.45V) (Cyrix Cx486DX4-100GP) Table 1P: CPU Type: - Am5x86 -P75 (3.
Chapter 2 Table 1Q: CPU Type: - P24D (DX4) 2.3 CPU INSTALLATION The mainboard has a socket that can support 486 CPU. See Fig 1 in Chapter 1 for the socket's location. Install the 486 CPU as follows: Caution: Static electricity can damage the processor. 1. Plug the 486 CPU into the socket, with the notch corner aligned. Fig 3 Installing a CPU 2. 14 Change the CPU type jumper setting according to the CPU Jumper Setting table on the previous pages.
Hardware Configuration 2.4 CACHE CONFIGURATION The special feature of the mainboard is a built-in direct-mapped cache controller with optional writeback or write-through operation that supports 128KB, 256KB or 512KB cache memory. The mainboard has a built-in cache controller. It requires external SRAM as tag and cache memory. The caching Scheme is direct mapping with selectable write-back or write-through operation. The mainboard allows 128KB, 256KB, and 512KB cache configurations.
Chapter 2 2.4.3 CACHE CHIP SOCKETS AND JUMPER LOCATIONS The diagram below describes the location of the cache chip sockets and cache jumpers.
Hardware Configuration 2.4.4 JP1-JP4, JP33 - CACHE & TAG RAM JUMPER SETTING Cache memory is configured using jumpers, JP1, JP3, & JP33; while Tag RAM setting is configured using jumpers JP2, JP4. The following tables summarize the possible configuration.
Chapter 2 2.4.5 INSTALLING CACHE CHIPS Install cache chips on the mainboard as follows: Caution: Static electricity can damage a cache chip. 1. Review the section on static electricity precautions at the beginning of this manual, and make sure that power to the mainboard is off. 2. Align the chip so that the notched corner of the chip matches the notched corner of the socket. 3. Align the pins with the socket holes. 4. Carefully press the chip into the socket.
Hardware Configuration 2.5 JP28, JP29 - VL-BUS IDENTIFY PINS Set the jumpers, JP28 & JP29 to configure the VL-Bus Clock Speed. Refer to Fig 2 for their location. Set the jumper as below. JP28, JP29 -- VL-Bus Clock Speed Table 4 2.6 JP16 - CMOS RAM BATTERY SETTING Please set JP16 is for CMOS RAM battery as below. Refer to Fig 2 for the location of JP16. JP16 -- CMOS RAM Battery Setting Table 5 2.
Chapter 2 2.8 JP20 - CPU CLOCK DELAY JP20 is for the CPU Clock Delay setting. Refer to Fig 2 for JP20 location. JP20 -- CPU Clock Delay Table 7 2.9 JP5, JP6, JP7 - CPU FREQUENCY CONFIGURATION JP5, JP6, & JP7 are for the CPU Frequency Configuration. Two different settings are provided for different Clock Generator that is used at U16 or U17. Refer to Fig 2 for the location of U16/U17 and jumpers.
Hardware Configuration 2.10 JP37 - FLASH ROM JUMPER JP37 is for Flash ROM selection. Refer to Fig 2 for its location.
Chapter 2 2.11 MEMORY INSTALLATION Four 72pin SIMM sockets are provided in 4 Banks. User can install 256Kx36, 512Kx36, 1Mx36, 2Mx36, 4Mx36, 8Mx36, or 16Mx36 SIMMs. Note that all SIMM modules in a bank must be same capacity and follow combination showed below. For best performance 70ns SIMMs are required.
Hardware Configuration BANK 0 BANK 1 BANK 2 BANK 3 MEMORY SIZE 4MB 8MB NONE NONE 12MB 4MB 4MB 4MB 4MB 16MB 8MB 8MB NONE NONE 16MB 16MB NONE NONE NONE 16MB 4MB 4MB 8MB NONE 16MB 1MB 16MB NONE NONE 17MB 1MB 1MB 16MB NONE 18MB 2MB 16MB NONE NONE 18MB 2MB 2MB 16MB NONE 20MB 4MB 16MB NONE NONE 20MB 4MB 8MB 8MB NONE 20MB 2MB 2MB 4MB 16MB 24MB 4MB 4MB 16MB NONE 24MB 8MB 8MB 8MB NONE 24MB 4MB 4MB 8MB 8MB 24MB 8MB 16MB NONE NONE 24M
Chapter 2 BANK 0 BANK 1 BANK 2 BANK 3 MEMORY SIZE 2MB 2MB 16MB 16MB 36MB 4MB 16MB 16MB NONE 36MB 4MB 32MB NONE NONE 36MB 4MB 4MB 16MB 16MB 40MB 4MB 4MB 32MB NONE 40MB 8MB 8MB 8MB 16MB 40MB 16MB 16MB 16MB NONE 48MB 16MB 32MB NONE NONE 48MB 8MB 8MB 16MB 16MB 48MB 8MB 8MB 32MB NONE 48MB 16MB 16MB 16MB 16MB 64MB 64MB NONE NONE NONE 64MB 16MB 16MB 32MB NONE 64MB 32MB 32MB NONE NONE 64MB 1MB 64MB NONE NONE 65MB 4MB 64MB NONE NONE
Hardware Configuration 2.11.1 INSTALLING SIMM Install a SIMM in a memory socket as follows: Caution: Static electricity can seriously damage SIMM modules. 1. Review the section on static electricity precautions at the beginning of this manual. 2. Align the SIMM module so that the pin-1 marking on the module corresponds to the socket pin-1 marking. 3. Hold the module at a 70-degree angle to the socket, and insert the module's connectors into the socket. 4.
Chapter 3 CHAPTER 3 MAINBOARD INSTALLATION Once the mainboard's hardware has been configured, the user is now ready to install the mainboard into the system chassis. This chapter describes what are needed to assemble an advanced computer system based on the mainboard. 3.1 COMPONENTS The following components are recommended: 26 • Case with standard chassis and hardware. The mainboard fits most AT compatible cases. • Standard AT power supply. • 8 ohm speaker. • Floppy disk drive(s) (360KB, 1.
Mainboard Installation 3.2 INSTALLING THE MAINBOARD Before starting, check the location of the mounting holes in the case and on the mainboard. Caution: Static electricity can damage the mainboard. Install the mainboard as follows: 1. Review the section on static electricity precautions at the beginning of this manual. 2. Place the case on an anti-static mat and remove the cover. Remove the nylon stand-offs and screws for mounting the mainboard. 3.
Chapter 3 3.3.
Mainboard Installation 3.4 CONNECTORS 3.4.1 CN1 - KEYBOARD CONNECTOR A standard five-pin female DIM keyboard connector is located at the rear of the keyboard. Plug the jack on the keyboard cable into this connector. Pin Description 1 Keyboard Clock 2 Keyboard Data 3 Spare 4 Ground 5 +5V DC Table 11 3.4.2 CN2 - POWER SUPPLY CONNECTOR The power supply connector has twelve-pin male header connectors. Plug the dual connectors from the power directly onto the board connector.
Chapter 3 3.4.4 J2 - GREEN POWER SUPPLY CONNECTOR Attach the green power supply control connector to J2. Pin Description 1 Pull Low on Power Down 2 GND Table 14 3.4.5 J3 - TURBO SWITCH CONNECTOR J3 connects to the Turbo switch, which is used to select the mainboard's clock speed. Table 15 3.4.6 J4 - TURBO LED CONNECTOR J4 is usually connected to a Turbo LED on front of the system case. If the system board select is in Turbo mode, the indicator will light during high-speed operation.
Mainboard Installation 3.4.8 J6 - RESET SWITCH CONNECTOR Attach the Reset switch cable to this connector. The Reset switch restarts the system. Setting Description Close Reset Open Normal Table 18 3.4.9 J7 - KEYLOCK & POWER LED CONNECTOR J7 is a keylock connector that enables and disables the keyboard and the Power-LED on the case. Pin Description 1 LED Power 2 Not Used 3 Ground 4 Keyboard Inhibitor 5 Ground Table 19 3.4.
Chapter 3 3.5 SYSTEM ASSEMBLY OVERVIEW After installing and connecting the mainboard, assemble components in the following order: 1. Power Supply: Place the power supply so that it fits the raised tongues on the chassis floor. Insert and fasten the two screws on the back panel of the chassis. Connect the power supply to the power supply connector. 2. Disk Drives: Slide disk drives into the chassis. Connect a wide 34-wire ribbon cable to each disk drive; this cable will attach to an adapter card.
Award BIOS Setup CHAPTER 4 AWARD BIOS SETUP Award's BIOS ROM has a built-in Setup program that allows users to modify the basic system configuration. This type of information is stored in battery-backed RAM so that it retains the Setup information when the power is turned off. 4.1 ENTERING SETUP Power on the computer and press immediately will allow you to enter Setup.
Chapter 4 4.
Award BIOS Setup 4.4 THE MAIN MENU Once you enter Award BIOS CMOS Setup Utility, the Main Menu will appear on the screen. The Main Menu allows you to select from ten setup functions and two exit choices. Use arrow keys to select among the items and press to accept or enter the sub-menu. ROM ISA BIOS (2C4I9G30) CMOS SETUP UTILITY AWARD SOFTWARE, INC.
Chapter 4 4.4.1 STANDARD CMOS SETUP MENU The items on Standard CMOS Setup Menu are divided into 10 categories. Each category includes no, one or more than one setup items. Use the arrow keys to highlight the item and then use the or keys to select the value you want in each item. ROM ISA BIOS (2C4I9G30) STANDARD CMOS UTILITY AWARD SOFTWARE, INC. Date (mm:dd:yy) : Thu, Mar 3 1994 Time (hh:mm:ss) : 11 : 23 : 53 Drive C : None ( 0Mb) Drive D : None ( 0Mb) 0 0 CYLS.
Award BIOS Setup 4.4.2 BIOS FEATURES SETUP MENU ROM ISA BIOS (2C4I9G30) BIOS FEATURES SETUP AWARD SOFTWARE, INC.
Chapter 4 4.4.3 CHIPSET FEATURES SETUP MENU ROM ISA BIOS (2C4I9G30) CHIPSET FEATURES SETUP AWARD SOFTWARE, INC.
Award BIOS Setup 4.4.4 POWER MANAGEMENT SETUP MENU ROM ISA BIOS (2C4I9G30) POWER MANAGEMENT SETUP AWARD SOFTWARE, INC.
Chapter 4 ROM ISA BIOS (2C4I9G30) POWER MANAGEMENT SETUP AWARD SOFTWARE, INC.
Award BIOS Setup 4.4.5 LOAD BIOS DEFAULTS MENU When you select this function, the following message will appear at the centre of the screen to assist you to load BIOS defaults (except Standard CMOS Setup). Load BIOS Defaults (Y/N)? 4.4.6 LOAD SETUP DEFAULTS MENU When you select this function, the following message will appear at the centre of the screen to assist you to load Setup defaults (except Standard CMOS Setup). Load SETUP Defaults (Y/N)? 4.4.
Chapter 4 4.4.8 IDE HDD AUTO DETECTION MENU This function will automatically detect the information of the Hard Disk, and list them for your reference. ROM ISA BIOS (2C4I9G30) CMOS SETUP UTILITY AWARD SOFTWARE, INC. CYLS. HEADS PRECOMP LANDZONE SECTORS Drive C : ( Mb) Select Drive C Option (N=Skip) : N OPTIONS SIZE CYLS. HEADS PRECOMP LANDZONE SECTORS MODE 1(Y) 81 903 4 65535 902 46 NORMAL ESC : Skip Fig 13 The BIOS support 3 HDD Mode, NORMAL, LBA & LARGE.
BIOS POST Message CHAPTER 5 BIOS POST MESSAGE When the BIOS encounters an error that requires the user to correct something, either a beep code will sound or a message will be displayed in a box in the middle of the screen and the message PRESS F1 TO CONTINUE, CTRL-ALT-ESC OR DEL TO ENTER SETUP will be shown in the information box at the bottom. 5.1 POST BEEP Currently there is only one beep code in BIOS.
Chapter 5 *** NOTE: When either of these errors appear, the system will boot in ISA mode, which allows you to run the EISA Configuration Utility. ERROR ENCOUNTERED INITIALIZING HARD DRIVE: Hard drive cannot be initialized. Be sure the adapter is installed correctly and all cables are correctly and firmly attached. Also be sure the correct hard drive type is selected in Setup. ERROR INITIALIZING HARD DISK CONTROLLER: Cannot initialize controller.
BIOS POST Message RAM PARITY ERROR messages when the segment that has caused the problem has been isolated. PRESS A KEY TO REBOOT: This will be displayed at the bottom screen when an error occurs that required you to reboot. Press any key and the system will reboot. PRESS F1 TO DISABLE NMI, F2 TO REBOOT: When BIOS detects a Non-markable Interrupt condition during boot, this will allow you to disable the NMI and continue to boot, or you can reboot the system with the NMI enabled.
