GCT-8STB Main Board

This motherboard was made by Hsing Tech  for Global Circuit Technology

Users Manual V1.1

Key Features

SiS 5577 BGA Chipset

Support P54C/P55C Pentium (MMX) CPUs with 321-pin (Socket 7) ZIF socket and Cyrex/IBM 6x86/6x86L/M2, AMD K5/K6, IDT C6 Processors

Support External Clock Speed at 75/66/60/55/50 MHz

Supports 2 banks of FP/EDO SIMM/DIMM, SRAM DIMM

Expandable Memory up to 256MB

Four 72-pin SIMM socket support FP/EDO DRAM

Two 168-pin DIMM sockets support FP/EDO DRAM

On-Board 64-Bit 512 KB L2 Cache

4 PCI Local Bus slots, and 4x16 bits ISA Bus Slots

All 4 PCI slots support Master Module.

System BIOS support 4 IDE harddisk drives that do not need driver for S/W application, the capacity of each harddisk can be up to 8.4 GB

PCI Bus Master IDE interface on board with 2 conectors supporting 4 IDE devices in 2 channel, the PCI IDE Controllers supports PIO Mode 0 to Mode 4 at a maximum trasnfer rate of 16.67 MB/s and Bus Master IDE DMA mode 2.

On board super Multi O/I chip thatt support 2 serial ports with 16650 Fast UART compatable, ! parallel opet with EPP and ECP capabilities, and a floppy disk drive interface.

DIMM Module 3.3V&5V jumper select support 3V/5V FP/EDO/SD DRAM.

System BIOS supports Green feature funtions & Plug and Play Flash ROM.

Support PS/2 Mouse Connection

Support the U.S.B. (option)

Support Ir connection (option)

Physical Dimentions: Length:220 mm / Width:280 mm

Jumper Settings

JP8 CPU Core Voltage Selectors

JP2 CMOS RAM

                             1       
Internal Battery Mode     OOOO

Discharge CMOS            OOOO

Extternal Battery Mode    OOOO

JP4 CPU Type Selector

P54C (Single Voltage) Intel P54C, AMD K5, IBM/Cyrex 6x86

         1
A    OOO
B    OOO

P55C (Dual Voltage)Intel P55C, AMD K6, IBM/Cyrex 6x86L

         1
A    OOO
B    OOO 

JP3 CPU External Clock Selectors

JP7 CPU Internal Clock Speed Selectors

JP5 DIMM Socket Voltage Selectors

3.3V

      1
A OOO
B OOO

5V

      1
A OOO
B OOO 

Set for 3.3V for SDRAM DIMM

Set for 5V for 72-pin SIMM or DIMM DRAM

JP6 Chipset Voltage Selectors

3.3V

      1
A OOO
B OOO

5V

      1
A OOO
B OOO 

Connectors

J3 AT Power Supply Connector

The power supply connector are 2 six-pin male header connections. Plug the dual connectors from the power directly into the board connectors. Most AT style power supplies have 2 leads. Each lead has six wires. Two of which are black, orient the connectors, so the black wires are in the middle.

J1 AT Keyboard Connector

A standard 5-pin AT keybard connector is located at the rear of the board.

J2 PS/2 Mouse Connector

A standard 8-pin mini DID PS/2 Mouse connector can be connected to J2

2 OOOO 8
1 O OO 7

1 - Mouse CLK
2 - Ground
3 - NC
4 - Mouse Data
5,6,7 - NC
8 - +5VDC

USB1 2 sets of Universial Serial Bus Connector

2 OOOOO 10
1 OOOOO 9

1, 2 - 5V-DC
3, 4 - DATA-
5, 6 - DATA+
7, 8 - Ground
9, 10 - Ground

The USB is optional. (I'd like to know what is needed to use this option.)

IR1 (Ir) Compliant Infrared Module Connector

1 OOOO 4

1 - Ir In
2 - Ground
3 - Ir Out
4 - + 5V

The Ir  is optional. (I'd like to know what is needed to use this option.)

COM1 : Serial Port - BIOS Selectable

COM2 : Serial Port - BIOS Selectable

PRN1 : Parallel Printer Connector - Bios Selectable

FDC1 : Floppy Drive Connector

IDE1 : Primary IDE Connector

IDE2 : Secondary IDE Connector

J6 (FAN-POW) CPU Cooling Fan Connector

1 OOOO 4

1 - +12V
2 - Ground
3 - Ground
4 - +5V

J5 (HDD-LED) HDD LED Connector

   +
OO OO OO OO
   HDD-LED

+ - 5V
Active Low

J5 (RST) Reset Switch Connector

The RESET switch on panel provides users with HARDWARE RESET function which is almost the same as power-on/off. The system will do a cold start after the RESET switch is pushed and released by user. The RESET switch is a 2 PIN connector and should be installed to RST on mainboard.

OO OO OO OO
RST

Open - Normal 
Short - Reset

J5 (TB-LED) Turbo LED Connector

The TURBO LED on panel can indicate the current speed status of system. The TURBO LED connector should be installed to TD in correct direction.

      +
OO OO OO OO
            TB-LED

+ - Vcc
Turbo Out

J4 (SPK) Speaker Connector

There is always a speaker in AT system for sound purpose. The 4 - Pins connector SPK is used to connect speaker. The speaker can work well in both direction of connector when it is installed to the connector SPK on mainboard.

                    1         4
OOOOO OOOO
                 SPK

1 - Data 
2 - NC
3 - Ground
4 - +5V

J4 (KEY LOCK) Keylock & Power LED Connector

There is a system power LED light on the panel of case. The power LED will light on when system is powered-on. The connector should be installed  in correct direction. to pins 1 and 2.

 1           5
OOOOO OOOO
KeyLock

1 - LED output 
2 - Ground
3 - Ground
4 - Keylock
5 - Ground

Component Location

 ____________________________________________________
|                                          J1   J2   |
|                                                    |
|                               COM1 COM2            |
|                                  PRN1       J3     | |              PCI1 PCI2 PCI3 PCI4                   |
|                                                    |
|   USB12              IR1                           |
|                      JP2         FDC1              | |                                                    |
|                                                    | |                                                    |
|                                                    | |                        JP3                         |
|                                                    |
|                                                    |
|                                                    | 
|J5 J6                                               |
|                                                    | |                                                    |
|                                             JP5    | |                                             JP6    |
|                                                    | |                                                    |
|                          JP8  JP7                  | 
|IDE1 IDE2    STANDBY LED                            |
 _____________________________________________________

72-pin SIMMs and 168-pin DIMMs DRAM Table :

Note :

1. The 168-pin DIMMs DRAM are +5V(Voltage), Please refer to 5V DIMM.
2. “-“=Empty.
3. If using 3.3 v SDRAM DIMMS do not use SIMMS.

Links to Other Sources of Information

GCT Global Circuit Technology (Supertek)

SiS website

Bus Master Drivers

BIOS Download

Unicore
Unicore has BIOS upgrades that support this board.

AMI BIOS Numbers

Driverzone.com

DriverGuide.com

Motherboard HomeWorld - motherboards.org

Miscellaneous

If you are trying to use a hard drive larger than 8 Gig with this board get a driver from your hard drive manufacture or purchase a BIOS upgrade from Unicore. I am using Max Blast Plus with my 16 Gig Maxtor HD with this board. A Unicore BIOS will cost about $30. A better option might be to replace your motherboard for about $50 - $100.

The part number for the AMI BIOS on my GTC-8STB is:

51-0825-001437-0010111-071595-SIS5577-001_10_SIS5577-H

1437 indicates the board was made by HSING TECH ENTERPRISE CO., LTD. or PC CHIPS

The TX3 chipset is a relabeled SiS 5571 chipset. You can use SiS Busmastering IDE drivers.

The following boards are all made by Hsing using the SiS 5571 or TX3 chipset.

PC Chips Model: M557  51-0224-001437-00111111-071595-571-007_66_571-H

GCT Model: ST-8STB    51-0820-001437-00101111-071595-TXpro-001_10_TXpro-H

Amptron Model: PM9100

RISE  Model: Mustang-R534E
GIGABYTE Model:  GA-586S, PCI-ISA BUS
AOPEN  Model: AP57
DFI  Model: STC/STE
PALIT  Model: M111
GLOBAL  Model: GCT-8ST
MSI  Model: MS-5144, SiS PCI-Pentium Sl12 M/B and MS-5146, SiS PCI-Pentium Sl13 M/B
ADVANTECH  Model: PCA-5862 PCM-6153 POS-560

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Last Update:  2/15/00