The Retro Web QDI SIS 471 Main Board User Guide

: September 20, 2024
: The Retro Web

Table of Contents

The Retro Web QDI SIS 471 Main Board
Introduction
Main Board Setup
Memory Installation
Jumper Setting Quick Reference
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The Retro Web QDI SIS 471 Main Board

The information in this document is subject to change without notice and does not represent a commitment on the part of the vendor. No warranty or representation, either expressed or implied, is made concerning the quality, accuracy, or fitness for any particular purpose of this document. The manufacturer reserves the right to make changes to the content of this document and/or the products associated with it at any time without obligation to notify any person or organization of such changes. In no event will the manufacturer be liable for direct, indirect, special, incidental, or consequential damages arising out of the use or inability to use this product or documentation, even if advised of the possibility of such damages. This document contains materials protected by copyright. All rights are reserved. No part of this manual may be reproduced or transmitted in any form, by any means, or for any purpose without express written consent. Product names appearing in this document are mentioned for identification purposes only. All trademarks, product names, or brand names appearing in this document are registered property of their respective owners. Printed in Taiwan

Introduction

About this Manual
This manual is arranged to help you set up and run this 486 main board as soon as possible. Information is presented in three chapters: In Introduction, we tell you what you should receive in your 486 main board as well as provide information on the features and specifications of the product. The chapter enclosed with a diagram showing the layout of the 486 main board. Chapter 2, Main Board Setup, includes detailed information on how to install and configure your 486 main board. Chapter 3, Memory installation, describes the size and configuration of your system’s on-board memory and external cache memory and gives instructions for installing the memory devices on the system board. When the above steps have all been completed, you will need to adjust the BIOS setup using the software utility described in the Appendix.

The Green PC Function
The Power Management Unit (PMU) of this board strictly controls and dramatically reduces overall system power consumption.
This is an accomplishment of the activity monitors which detect the system inactivity timer time-out, and signals the power-saving devices to slow down the clock frequency or remove the power sources from various peripherals. There are four Power management mode in this board: Normal, Doze, Standby and Suspend mode.

NORMAL mode: This mode is the normal operation mode of the PC system. In this mode, the doze timer start counting if no activity is taking place and the programmable time-out period has expired.
DOZE mode: In this mode, CPU frequency is slow down to lower frequency.
STANDBY mode: There are two options in the standby mode. One option is to put CPU in the STOPGRANT state, and the other is to scale the CPU and system clock to a lower frequency.
SUSPEND mode: In this mode. The PMU will stop the CPU clock (OMHz), slow down the system clock, reduce the External Cache and so on. More detail information, please refer to Appendix A-4.

1-3 Main Board Specifications

Fully PC/AT Compatible System

Support CPU Type:

Intel 486SX/DX/DX2/DX4/SL-Enhanced/P24D/OverDrive/P24T CPUs
AMD Am486 DX/DX2/DX4 CPUs
Cyri Cx486 DX/DX2/DX2V CPUs
UMC USS
System clock 25/33/40/50MHz
237-Pin ZIF CPU socket.

Memory:

72pin SIMM Socket x 4 (1/2/4/8/16/32MB 32/36-bits 70/80-s SIMM Modules acceptable)
Maximum 128MB On board

Cache memory :

Support Cache memory size 0/128/256/512KB (32Kx8,64Kx8 DIP) and 1MB (128Kx8 DIP)

Expansion Slots

ISA slot 16 bits x 4
PCI slots x 3

Built-In Enhanced IDE Controller

Supporting up to 4 hard drives
Compliant ATA spec.

On Board Ultra 1/0

UMC 8663
1 Floppy disk port
2 Serial ports (16550 compatible)
1 printer port (Support SPP/EPP/ECP)
1 Game port

ShadowRAM:

System BIOS, Video BIOS and Other Adapter ROM BIOS

BIOS:

Award system BIOS

PCB Size: 220mm x 250mm

Software/Hardware turbospeed toggle

Green PC :

Meet EPA Green PC standard: power consumption under 30W on the Doze, Standby or Suspend mode

Regulator on board

Why EPP, ECP and 16550

EPP (Enhanced Parallel Port ) is an IEEE P1284 standard.
ECP (Extended Capabilities Parallel Port) is a protocol created by Microsoft and H.P. Both EPP and ECP are designed to provide a high performance, standard solution for connecting external devices such as CD-ROM, HDD, Printer … etc. The high speed UART 16550 (baud rate supported from 50 baud to 115.2K baud) was announced to collaborate high speed modem needed nowadays.

Main Board Layout

Main Board Setup

If your mainboard has already been installed by the dealer, you will still want to refer to this chapter in case you plan to make any changes or upgrade your system.

How to set Jumper
Jumper switch is used to select between various operating modes. A jumper switch consists of two or three gold pins stretches out from the system board. Placing the plastic jumper cap over two pins connects those pins and makes a particular selection. By using the cap to connect two pins is to short those pins. If the cap is not placed on any pins, it indicates to leave the pins open.

CPU Type and System Clock Setting
The main board can support all 486 serial microprocessors up to DX4 (P24C), runningthee the ystem at a clock speed of up to 50Mhz. If you are installing or upgrading the CPU on this board, you must set the CPU type JP31, JP39, JP40, JP42, JP43, /2 -J7) and configure the system clock generator jumper UP22, JP23) to match the speed rating of the Microprocessor.

System Clock Setting Configuration (JP22, JP23)

CPU Type Jumper Setting

Connectors and Jumper Setting
Connectors are used to connect the system board to other parts of the system, including the power supply, the keyboard, and the various controllers on the front panel of the system case. When connecting connect-wires to the connectors you should remember that some of them must be aligned in a specific way to have proper function.

Power Supply Connector (PI)
When installing the board, the power supply connector is usually the last connector to be connected before installing the system peripherals. Before connecting the power supply, check that it is not connected to a power source. Most power supplies have two sets of six-wire connectors that must be connected to the system board. Two of the wires on each connector are black. While connecting these two connectors, be sure that the four black wires are located in the middle.

Keyboard Connector (J1)

Keyboard Lock Connector (JP45)
When this connector is connected to the keylock on the front panel of the system case, the keylock can enable or disable the keyboard. It prevents other users from operating your computer. As clearly labeled on the board, Pin 1 of the keyboard lock connector is counted from the left.

Speaker Connector (JP37)
An external speaker mounted inside the case can connect to the main board via this connector.

External or Internal Battery Power Connector (JP12)
This connector may be used to connect an external 4.5V to 6V battery to back up or replace the on-board battery. When connecting the external battery, the connecting wire must be placed correctly.

System Reset Switch Connector (JP44)
This connector should be connected to the Reset switch on the front panel of the system case. The reset switch allows you to restart the system without turning it off.

Hardware Turbo Switch Connector (JP35)
The hardware turbo switch connector is used to connect the board to a hardware turbo switch on the front panel of the system unit. If connected, the hardware turbo switch can be used to toggle the turbo (high speed) mode on or off.

Other hilow-speedeed changes by Keyboard.

“CTRL-ALT-“: Set to Low speed
“CTRL-ALT-+”: Set to High Speed

Turbo LED Connector (JP36)

The turbo LED connector is connected to a turbo LED on the front panel of the system case. If connected, the turbo LED will light on whenever the system is running at a high-speed mode.

Power Saving Toggle Switch Connector (JP29)
If you have a power saving control switch on the front panel of the system case, you can trigger the system into Suspend mode directly. Meantime the CPU clock will be down to zero Hz and also power down the external cache circuit to reduce the total power consumption of the system. The system will wake up when the keyboard or mouse is touched.

Green LED Connector (JP27)

PCI-BUS Clock Setting (JP21)

CMOS DATA Clear Jumper (JP13)
This jumper is used to clear the system configuration data which is stored in the CMOS RAM and reload the default system configuration setting. ( The function would be useful if you forget the user’s password for the system )

Hard Disk LED Connector (JP14, JP15)

ECP DMA Channel Setting Jumper (JP1, JP2)

Memory Installation

This 486 main board can operate from 1MB up to 128MB of system memory installed on-board. There is also an external cache memory on the system board that may be installed as either OKB or up to 1MB in size. This chapter describes the types of memory devices that should be used with the main board and shows how to install the memory.

External Cache Memory Configuration
When you first install the cache memory on your system board or each time you upgrade or modify it, you will need to adjust the cache memory size setting for the system. The cache memory size for the system is set by adjusting Jumpers JP17 – JP20, JP25 and JP26.

1-2″ means Pin 1 and. Pin 2 short together
If you want to install the SRAM by yourself, please consult the mainboard dealer which can provide more detailed information.

Main Memory Configuration

The system provides four 72-pin SIMM sockets, which can be configured for memory sizes from 1MB to 128MB, and ooffers table-free DRAM SIMM installation way to allow users to use any kind of SIMM with random combinations.

Require Memory Specifications