BBC Microcomputer Service Manual Oct 1985 Section 1 BBC Micro ...

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Within this publication the term 'BBC' is used as an abbreviation for 'British Broadcasting Corporation'. Copyright ACORN Computers Limited 1985 Neither the whole or 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 caused by service or maintenance by unauthorised personnel. This manual is intended only to assist the reader in the use of this 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. This manual is for the sole use of ACORN Computers' authorised dealers and must only be used by them in connection with the product described within. First published 1985 Published by ACORN Computers Limited
SECTION 1 BBC Microcomputer Models A & B
Page 3: BBC Microcomputer service manual SE
Page 8 and 9: 6 - Servicing + Fault-finding 6.1 I
Page 11 and 12: 1 Introduction 1.1 Nature and Purpo
Page 13 and 14: 1.2.2 Model B Specification The Mod
Page 15 and 16: 1.2.6 BASIC The BASIC interpreter i
Page 17 and 18: In the other screen modes, the info
Page 19 and 20: 3. Detailed Circuit Description 3.1
Page 22 and 23: 3.3 CRT controller + video processo
Page 24 and 25: The row address strobe signal is pr
Page 26 and 27: The speed of printing on the screen
Page 28 and 29: The CRTC is still used to generate
Page 30 and 31: is also determined by the control r
Page 32 and 33: 3.9 A to D convertors A four channe
Page 34 and 35: 3.13 1 MHz bus The address and data
Page 36 and 37: ii) Insert the above ICs into the s
Page 38 and 39: Edge connector pin number |6|7|8|9|
Page 40 and 41: R39-100k R47-1k5 R61-1k0 ii) Solder
Page 42 and 43: 10. WEST selects 5 1/4" disc. EAST
Page 44 and 45: 32. WEST selects A 13 input to pin
Page 46 and 47: 5.3 Circuit Modifications from issu
Page 48 and 49: 6 Servicing and Fault-finding 6.1 I
Page 50 and 51: iii) Check for the presence of the
Page 52 and 53: * On a number of occasions, the tra
Page 54 and 55:
6.5 Test programs and sample wavefo
Page 56 and 57:
The 'following shows two more trace
Page 58 and 59:
170 !(&3200 + offset%) = &4433283F
Page 60 and 61:
7 Interfacing Survey 7.1 Purpose of
Page 62 and 63:
The other way in which the RS423 ca
Page 64 and 65:
The 20-way User Port is much simple
Page 66 and 67:
8 Component location tables The fol
Page 68 and 69:
8,2 Transistors Q Type Circuit Diag
Page 70 and 71:
8,5 Resistors R Value Circuit Diagr
Page 72 and 73:
116 3k9 14,2 117 2k2 14,2 118 1k0 1
Page 74 and 75:
6 4
Page 91 and 92:
9.8 Parts list CASE LOWER ASSEMBLY
Page 93 and 94:
65 631,047 CAPACITOR 47pF PLATE CER
Page 95 and 96:
9.9 Glossary of abbreviations ACK A
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BBC Microcomputer Service Manual Oct 1985 Section 1 BBC Micro ...

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