Mitsubishi Electric Apricot Manual de usuario

apricot

Qi 486

ADD-ON INSTALLATION GUIDE

MITSUBISHI ELECTRIC

Informationcontainedinthisdocumentissubjecttochangewithoutnoticeand

doesnot represent a commitment on thepart of Apricot Computers Limited. The

softwaredescribedinthis manual is furnished under a license agreement. The

software may be used or copied only in accordance with the terms of this

agreement.

It is against the law to copy any disk supplied for any purpose other than the

purchaser’spersonaluse.

Publishedby

ApricotComputersLimited

3500Parkside

BirminghamBusinessPark

B377YS

MITSUBISHIELECTRIC

PrintedintheUnitedKingdom

Partno.15007631

Contents

Introduction 2

Anti-static precautions 3

Installing extra memory 4

Installing an 80487SX in Qi 486SX 11

CPU module upgrades 18

Introduction

This guide contains instructions on installing extra memory

in Qi 486 and 486SX, and an 80487SX coprocessor in a

Qi 486SX. This document should be your only source of

information when installing extra memory or a

coprocessor.

You should read this document before purchasing extra

memory or a coprocessor. If, having read the relevant

instructions, you are not confident about installing the

upgrade, you may wish to have your supplier or service

organisation install it for you.

Warning

Never carry out any work on the computer with power

applied. Always switch off at the mains and remove the

power lead from the system unit before starting work.

Before you start installing the upgrade you should be

thoroughly familiar with all the relevant instructions in this

guide and the appropriate sections of your

Owners

Handbook

CPU module upgrade

The system boards in Qi 486SX and Qi 486 have

removable CPU modules. These modules can be removed

and replaced without replacing the entire system board.

80486SX CPU modules can be removed and replaced

with a CPU module fitted with an 80486DX. This upgrade

is not user installable. Contact your supplier or service

organization for details.

Anti-static precautions

All electronic components and equipments are sensitive to

static electricity. Even small electrostatic discharges can

render components useless or severely shorten their

working life, therefore you should always take preventative

measures.

No work should be carried on any item unless it is in a

Special Handling Area (SHA) as defined in BS CECC

00015:Part 1. In general this involves:

* a common earth point

* an earthed bench or bench mat

* an earthed wrist strap

Installing extra memory

The system board in your computer has eight sockets for

Single Inline Memory Modules (SIMMs). The system board

treats these sockets as two sets of four. Each set of four

sockets must either be all occupied, or all empty. SIMMs

are supplied in sets of four.

How much memory

Three different capacities of SIMM are available:

256kbyte, 1Mbyte and 2Mbyte, giving upgrade kit

capacities of 1, 4 and 8 Mbytes. The system board does

not support all possible combinations of these three

capacities. The following table shows the RAM capacities

supported:

Memory Fitted SIMM Capacity

Set 0 Set 1

1 Mbyte 256k -

2 Mbyte 256k 256k

4 Mbyte 1M -

5 Mbyte 256k 1M

8 Mbyte 1M 1M

12 Mbyte 2M 1M

16 Mbyte 2M 2M

If you do not know how much memory is fitted to your

system, you can find out when you switch your computer

on. During the power up sequence on-board memory is

tested and the capacity is displayed on the screen.

On the start up screen two memory capacities will be

shown: base and extended. By adding the base and

extended memory capacities together and dividing by

1024 you will arrive at the amount of RAM (in Mbytes)

fitted to your system board. The result should always be

an integer.

If the result of the calculation is not an integer you

probably have ROM BIOS shadowing enabled and you

should add 384kbytes to the total you arrived at before

dividing by 1024.

The following diagrams show which type of SIMM should

be fitted in each slot for each possible memory capacity.

The memory sockets are labelled ‘MM1’ to ‘MM8’, note

that the sockets are not numbered in sequence.

TOWARDS REAR OF MACHINE TOWARDS REAR OF MACHINE

256 KBYTE MODULES

1 MBYTE MODULES256 KBYTE MODULES

Orientation 1 Mb

2 Mb 4 Mb

MM4

MM8

MM3

MM7

MM2

MM6

MM1

MM5

TOWARDS REAR OF MACHINE TOWARDS REAR OF MACHINE

1 MBYTE MODULES

2 MBYTE MODULES2 MBYTE MODULES

5 Mb 8 Mb

12 Mb 16 Mb

1 MBYTE MODULES

256 KBYTE MODULES

1 MBYTE MODULES

Obtaining access

The SIMM sockets are accessible with the system unit

cover removed. To obtain access:

1. Take suitable anti-static precautions.

2. Remove the system unit cover as described in your

Owner’s Handbook

3. Identify the SIMM sockets from the illustration

below.

SWITCHES

SIMMS

Removing and replacing SIMMs

If you are fitting additional SIMMs remove those already

installed.

Removing SIMMs

Starting with the SIMM nearest the front of the system unit

and working towards the rear:

1. Note which socket the SIMM is in.

2. Lever the metal clips on each side of the socket

gently away from the SIMM using your thumbnails.

When the clips are far enough apart the top edge

of the SIMM will move forward until the SIMM is at

an angle of about 15°.

3. Taking care to avoid touching any of the

components on the SIMM grip the top corners of

the SIMM between thumb and first finger and

carefully pull the SIMM out of the socket.

4. Repeat steps 1 to 3 for all the other SIMMs.

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