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Mitsubishi Electric apricot Installation Manual

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ADD-ON INSTALLATION GUIDE
Qi 486
apricot
MITSUBISHI ELECTRIC

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  • Page 1 ADD-ON INSTALLATION GUIDE Qi 486 apricot MITSUBISHI ELECTRIC...
  • Page 2 Information contained in this document is subject to change without notice and does not represent a commitment on the part of Apricot Computers Limited. The software described in this manual is furnished under a license agreement. The software may be used or copied only in accordance with the terms of this agreement.
  • Page 3: Table Of Contents

    Contents Introduction 2 Anti-static precautions 3 Installing extra memory 4 Installing an 80487SX in Qi 486SX 11 CPU module upgrades 18...
  • Page 4: Introduction

    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.
  • Page 5: Anti-Static Precautions

    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.
  • Page 6: Installing Extra Memory

    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.
  • Page 7 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. Orientation 1 Mb TOWARDS REAR OF MACHINE TOWARDS REAR OF MACHINE 256 KBYTE MODULES 2 Mb...
  • Page 8 5 Mb 8 Mb TOWARDS REAR OF MACHINE TOWARDS REAR OF MACHINE 1 MBYTE MODULES 1 MBYTE MODULES 256 KBYTE MODULES 12 Mb 16 Mb TOWARDS REAR OF MACHINE TOWARDS REAR OF MACHINE 1 MBYTE MODULES 2 MBYTE MODULES 2 MBYTE MODULES...
  • Page 9 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.
  • Page 10 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.
  • Page 11 Inserting SIMMs From the illustrations showing the possible SIMM combinations decide which SIMM capacity will be installed in each slot. Then, working from the socket nearest the rear of the system unit towards the front, install the SIMMs. To fit a SIMM: 1.
  • Page 12 7. Rotate the SIMM into the vertical position by pushing gently on the top corners. 8. If the SIMM is properly located the SIMM should remain in position held by the securing clips, and with a small plastic lug through the holes on either side of the SIMM.
  • Page 13: Installing An 80487Sx In Qi 486Sx

    Installing an 80487SX in Qi 486SX The 80486SX CPU module provides a co-processor socket for an 80487SX. The socket can be configured to accept either an 80486SX or an 80487SX. Normally, the socket will be free, the 80486SX will be soldered directly to the CPU module, and the socket will be configured for an 80487SX.
  • Page 14 5. Identify the 80487SX socket. 80486SX 80487SX SOCKET From the illustration above, you will be able to identify the 80487SX socket. If the socket is unoccupied, and an 80486SX is soldered to the CPU module as shown, you can install the 80487SX as described in Installing the 80487SX .
  • Page 15 Configuring the 80487SX socket If the 80486SX is soldered directly to the CPU module the socket will already be configured for an 80487SX. If an 80486SX is installed in the socket it must be removed and the socket reconfigured, before the 80487SX can be installed.
  • Page 16 If the socket is configured for an 80487SX two jumpers will be fitted and the switch will be away from the socket, as shown in the following illustration. SYSTEM BOARD If the jumpers and switch are not as shown above, reconfigure the socket by moving the jumpers and switch to the correct positions.
  • Page 17 80486SX configuration If the socket is configured for an 80486SX one jumper will be fitted and the switch may be in either position. The switch will normally be away from the socket, as shown in the following illustration. SYSTEM BOARD Note A second jumper should be fitted to one of the unused posts on the jumper block.
  • Page 18 Installing the 80487SX With the co-processor socket empty and correctly configured you can install the 80487SX as follows: 1. Identify the 80487SX socket. PIN 1 SYSTEM BOARD 2. The 80487SX has a positioning guide in the form of a small dot of paint. Carefully position the 80487SX above the socket with the positioning guide at pin 1.
  • Page 19 Removing a tape drive If your computer has a tape drive fitted this must be removed to allow access to the CPU module. To remove the drive follow the procedure below. 1. Remove the four screws that secure the drive cover, drive and earth tag.
  • Page 20: Cpu Module Upgrades

    80486 CPU module. depnding the the processor clock speed it may also be possible to upgrade an 80486DX based system to a faster processor. Contact your Apricot supplier for information about the availability of such modules.
  • Page 21 APRICOT COMPUTERS LIMITED 3500 PARKSIDE BIRMINGHAM BUSINESS PARK BIRMINGHAM B37 7YS. MITSUBISHI ELECTRIC Part No 15007631 Revision 01...

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Qi 486