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  • Introduction

    AMSTRAD CPC6128 Integrated Computer/Disc System A Logical Progression AMSTRAD's hugely successful CPC464 and CPC664 systems have provided a sound basis for further development, and now we proudly present the CPC6128. In keeping with our policy of compatibility, the CPC6128 will operate with software from both the CPC664 and CPC464 systems -but additionally provides a further 64K bytes of RAM for use with CP/M and other user applications.

    CP/MPlus CP/M Plus (also known as CP/M 3.1) provides very easy access to the library ofCP/M 80 software. The 61K TPA means that any CP/M 80 program will find room to run, and provide ample space for data. CP/M Plus is compatible with CP/M 2.2, although we have provided both versions to ensure that applications developed using firmware features in the AMSTRAD CP/M 2.2 systems will operate without modification. CP/M Plus includes many enhancements that improve the performance of the system, and most existing CP/M 2.2 software can take advantage of these facilities without conflict. The CP/M Plus system incorporates a specific terminal emulation feature whereby software that is configured to use screen handling characteristics

    _similaLto_VT52and.Zenith-Z19/Z29-terminals-can-be installed-without further customisation.

    GSX The Graphics Extension System supplied with this version of CP/M Plus enables applications programs to address printers/plotters and the screen using standard instructions that extend the concept of CP/M program portability beyond the text screen. Software that takes advantage of GSX will be able to be interfaced with a number of graphics devices to provide hard copy of graphs, diagrams etc.

    Dr. LOGO Digital Research's LOGO continues to make inroads into computer education - and the increased memory of the 6128 has permitted extensions to the Dr. LOGO first used under CP/M 2.2. Programs will of course be upwards compatible from AMSTRAD CP/M 2.2.

    Introduction CPC 6128

  • Disc The CPC664 set the standard for the future with its built in disc system, and the CPC6128 continues to bring low cost disc computing to increasingly demanding and exacting users who want personal computer performance at a home computer price. The discs from all AMSTRAD systems are interchangeable, although programs that take advantage of the advanced features of CP/M Plus and GSX will obviously not work on models without these facilities. Finally, the CPC6128 is supported by one of the largest consumer electronics organisations in the country, and the AMSTRAD computer users' club with its authoritative monthly magazine is already firmly established as the leading source of news and information.

    Software The CPC6128 runs all CPC664 and CPC464IDDIl disc software, and virtually all CPC464 cassette software (with a cassette unit connected to the CPC6128 of course), giving the owner an instant and enviable choice of software from AMSOFT's extensive range, as weB as the products of many independent vendors.

    AMSOFT A di vision of

    CONSUMER ELECTRONICS PLC.

    Copyright 1985 AMSOFT, AMSTRAD Consumer Electronics plc.

    Neither the whole nor any part of the information contained herein, nor the product described in this manual, may be adapted or reproduced in any material form except with the prior written approval of AMSTRAD Consumer Electronics plc. ('AMSTRAD'). The product described in this manual, and products for use with it are subject to continuous development and improvement. All information of a technical nature and parti~ulars of the product and its use (including the information and particulars in this manual) are given by AMSTRAD in good faith. However, it is acknowledged that there may be errors or omissions in this manual. A list of details of any amendments or revisions to this manual can be obtained by sending a stamped, self addressed envelope to AMSOFT Technical Enquiries. We ask that all users take care to submit their reply paid user registration and guarantee cards. You are also advised to complete and send off your Digital Research User registration card.

    CPC 6128 Introduction

  • AMSOFT welcome comments and suggestions relating to the product or to this manual.

    All correspondence should be addressed to:

    AMSOFT Brentwood House, 169 Kings Road,

    Brentwood, EssexCM144EF

    All maintenance and service on the product must be carried out by AMSOFT authorised dealers. Neither AMSOFT nor AMSTRAD can accept any liability

    whatsoever for any loss or damage caused by service or maintenance by unauthorised personnel. This guide is intended only to assist the reader in the use of the product, and therefore AMSOFT and AMSTRAD shall not be liable for any loss or damage

    whatsoever arising from the use of any information or particulars in, or any error or omission in, this guide or any incorrect use of the product.

    Dr. LOGO, CPIM, CP/M Plus, GSX, and DR Graph are trademarks ofDigital Research Inc. Z80 is a trademark ofZilog Inc.

    IBM and IBM PC are trademarks ofInternational Business Machines Inc. Z19, Z29, and H89 are trademarks of Zenith Data Systems Inc.

    VT52 is a trademark of Digital Equipment Corp. AMSDOS, CPC6128, CPC664, and CPC464 are trademarks of AMSTRAD.

    First Published 1985. ---.---- - --- - - - - --- - - - -SecondEditionSummer1985.-- - -- -

    Third Edition Winter 1985.

    Compiled by Ivor Spital Written by Ivor Spital, RolandPerry, William Poel, CliffLawson, with acknowledgements to Locomotive Software Ltd.

    Introduction

    Contributions by Alexander Martin, David Radisic, Ken Clark.

    Published by AMSTRAD. Typeset by KAMSETtypesetting graphics (Brentwood).

    AMSTRAD is a registered trademark of AMSTRAD Consumer Electronics plc. Unauthorised use of the trademarks or word AMSTRAD is strictly forbidden.

    CPC 6128

  • IMPORTANT

    You must read this ....

    Installation Notes 1. Always connect the Mains Lead to a 3-pin plug following the instructions

    contained in part 1 of the Foundation course.

    2. Never attempt to connect the system to any Mains Supply other than 220-240V ~ 50Hz.

    3. There are no user serviceable parts inside the system. Do not attempt to gain access into the equipment. Refer all servicing to qualified service personnel.

    4. To avoid eye-strain, the monitor should be placed as far away as possible from the keyboard and operated in an adequately lit room. The monitor BRIGHTNESS control should be kept to as Iowa setting as possible.

    5. The computer should be placed centrally in front of the monitor, but as far away from the screen as possible. For maximum data reliability, the disc drive section of the computer should NOT be placed directly in front ofthe monitor, but to the right of it. Do not place the computer close to any source of electrical interference.

    6. Always keep disc dri ves and discs away from magnetic fields.

    7. If you are operating a 2-drive system, keep the interconnecting ribbon cable to the 2nd drive, away from Mains Leads.

    8. Do not block or cover any ventila tion holes.

    9. Do not use or store the equipment in excessively hot, cold, damp, or dusty areas.

    Operation Notes (Don't worry if you are a little baffled by the technical jargon in this section; the importance of these warnings will become clearer as you work through this manual.)

    1. Never switch the system on or off with a disc in the drive. Doing so will corrupt your disc, losing valuable programs or data.

    Warnings CPC 6128

  • 2. Always make back-up (duplicate) copies of discs which contain valuable programs. It is especially important to make back-up copies ofthe master CP/M system discs provided with the 6128. Should you otHerwise accidentally lose or corrupt your discs, replacing them could prove expensive.

    3. Make sure that you do not accidentally overwrite your master CP/M system discs, by ensuring that the Write Protect holes on the discs are always open.

    4. If you are operating a 2-drive system, i.e. if you have purchased an additional AMSTRAD FD1, always switch on the 2nd disc drive before switching on the computer.

    5. Never touch the floppy disc surface itself, inside its protective casing.

    6. Do not eject a disc while it is being read from or written to. 7. Always remember that formatting a disc will erase any previous contents.

    8. The internal disc interface occupies a small portion ofthe memory that in some cases, was used by commercial writers of cassette based software for the AMSTRAD model CPC464. These cassettes will not operate properly with the 6128 + Cassette unit. If you have any queries regarding cassette based software compatibility, contact AMSOFT on Brentwood (0277) 230222. Note however, that most major AMSOFT software titles are available on disc for the 6128.

    9. The licence agreement for your CP/M system discs, (which are electronically serial-number encoded) permit their use on a single computer system only. In particular this means that you are prohibited from giving any other person a

    _CPC 6128 Warnings

  • Contents

    Chapter I Foundation Course Setting up Connecting peripherals Floppy discs Keyboard familiarisation Loading software, and the 'Welcome' program Introduction to BASIC keywords Introduction to disc operations Modes colours and graphics Sound -Introduction to AMSDOS and CP/M Introduction to the Bank Manager

    Chapter 2 Beyond Foundations

    Writing a simple program Evolution and afterthoughts Using an array Introducing a menu Loading and saving variables to disc Editing and line numbering

    --'I'idying-upa-progmm--------------- ------ --

    Chapter 3 Complete List of AMSTRAD CPC6128 BASIC Keywords Description of notation used Alphabetical