Acorn BBC Micro Model B w/8271 User Guide Manual PDF (EN)

BBC Microcomputer System User Guide Original edition written by John Coll, edited by David Allen. Amendments and corrections to this edition by Acorn Computers Limited Part no 0433 000 Issue 1 Date October 1984

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WARNING: THE COMPUTER MUST BE EARTHED Important: The wires in the mains lead to the computer are coloured in accordance with the following code: Green and yellow Earth Blue Neutral Brown Live As the colours of the wires may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows: The wire which is coloured green and yellow must be connected to the terminal in the plug which is marked by the letter E, or by the safety earth symbol or coloured green, or green and yellow. The wire which is coloured blue must be connected to the terminal which is marked with the letter N, or coloured black.

The wire which is coloured brown must be connected to the terminal which is marked with the letter L, or coloured red. If the socket outlet available is not suitable for the plug supplied, the plug should be cut off and the appropriate plug fitted and wired as previously noted. The moulded plug which was cut off should be disposed of as it could be a potential shock hazard if it were to be plugged in with the cut off end of the mains cord exposed. The moulded plug must be used with the fuse and fuse carrier firmly in place. The fuse carrier is of the same basic colour* as the coloured insert in the base of the plug. Different manufacturers’ plugs and fuse carriers are not interchangeable.

In the event of loss of the fuse carrier, the moulded plug MUST NOT be used. Either replace the moulded plug with another conventional plug wired as previously described, or obtain a replacement fuse carrier from an authorised BBC Microcomputer dealer. In the event of the fuse blowing it should be replaced, after clearing any faults, with a 3 amp fuse that is ASTA approved to BS1362. *Not necessarily the same shade of that colour. Exposure Like all electronic equipment, the BBC Microcomputer should not be exposed to direct sunlight or moisture for long periods.

©The author and the British Broadcasting Corporation 1982 Econet and The Tube are trademarks of Acorn Computers Limited Neither the whole nor any part of the information contained in, or the product described in, this manual may be adapted or reproduced in any material form except with the prior written approval of Acorn Computers Limited (Acorn Computers). 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 particulars of the product and its use (including the information and particulars in this manual) are given by Acorn Computers 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 upon request from Acorn Computers Technical Enquiries. Acorn Computers welcome comments and suggestions relating to the product and this manual. All correspondence should be addressed to: Technical Enquiries Acorn Computers Limited Newmarket Road Cambridge CB5 8PD All maintenance and service on the product must be carried out by Acorn Computers’ authorised dealers. Acorn Computers can accept no liability whatsoever for any loss or damage whatsoever caused by service or maintenance by unauthorised personnel. This manual is

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intended only to assist the reader in the use of the product, and therefore Acorn Computers 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 manual, or any incorrect use of the product. First published 1984 Published by the British Broadcasting Corporation Typeset by Bateman Typesetters, Cambridge Within this publication the term ‘BBC’ is used as an abbreviation for ‘British Broadcasting Corporation’. This book is part of the BBC Computer Literacy Project, prepared in consultation with the BBC Continuing Education Advisory Council. The editor of the project is David Allen Note:

If this manual is to be used in conjunction with a BBC Microcomputer which is fitted with an Operating System with version number lower than 2.00, then the following points should be borne in mind: – Chapter 42 and all other references to the ‘shadow screen’ should be ignored. – Chapter 49 should be ignored (unless the machine with which the manual is to be used is fitted with BASIC II). In all other respects this manual is functionally compatible with earlier versions of the BBC Microcomputer.

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Contents Introduction 1 Equipment required 1 Text conventions used in this manual 1 What this user guide can and can’t do 2 1 Getting started 3 Experimenting 5 Connecting up the cassette recorder 7 Leads 7 Volume 8 Running the WELCOME programs 8 The keyboard 11 Cursor control keys 13 Giving the computer instructions – Part 1 2 Commands 15 3 An introduction to variables 18 4 A simple program 20 Using the screen editor 22 Deleting part of a program 24 Removing a program 25 5 Recording programs on cassette 26 Saving a program on cassette 26 Checking a recording 27 Loading a program from cassette 27 Cataloguing a tape 28 What the numbers mean 28 6 Sample programs 30

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