Disc System User Guide (1982).

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©© Acorn Computers Ltd 1982 First published 1982 This book is set in 10/12 point Palatino Printed by Yale Press, London SE25 Published by the British Broadcasting Corporation 35 Marylebone High Street London W1M 4AA ISBN 0 563 16572 3
Contents Introduction 5 1 What is a disc system? 6 A disc drive Disc filing system Controlling the filing system Summary 2 Getting going 11 Connecting the disc drive Starting the filing system Running the WELCOME programs Copying the master disc 3 Discs 13 Handling Prevention of accidental erasure Tracks, sectors and bytes What is formatting? 4 Disc files 21 File specification Multi-file operations Auto-start facilities Library files 5 The filing system commands 25 6 The filing system utilities 60 Formatting 7 Random access files 64 8 Using the filing system in assembler 69 General principles Read/write one byte Read/write a group of bytes Read/write a sector
Page 6 and 7: 9 Changing filing systems 75 10 Err
Page 8 and 9: 1 What is a disc system? If you hav
Page 10 and 11: computer the name of the file conta
Page 12 and 13: — The disc filing system controls
Page 14 and 15: more detail later. Now press SPACE
Page 16 and 17: Diagram 2: A 5¼" disc
Page 18 and 19: to copy a complete disc or specifie
Page 20 and 21: Diagram 4 Single disc drive copying
Page 22 and 23: Diagram 5 Tracks, sectors, bytes
Page 24 and 25: The drives are numbered as shown be
Page 26 and 27: Option 0: ignores !BOOT Option 1: *
Page 28 and 29: Notes Particular points to watch fo
Page 30 and 31: Important Locking a file does NOT p
Page 32 and 33: *BUILD Purpose To create a file di
Page 34 and 35: Notes Permitted values of are 0, 1
Page 36 and 37: Diagram 6 *COMPACT Warning This com
Page 38 and 39: *DELETE Purpose To remove a single
Page 40 and 41: *DIR () Set the directory Purpose T
Page 42 and 43: *DUMP Purpose Produces a hexadecim
Page 44 and 45: * EXEC execute Purpose This comman
Page 46 and 47: *INFO Purpose Displays information
Page 48 and 49: On entry X and Y point to a block o
Page 50 and 51: *LOAD Purpose Reads a named file
Page 52 and 53:
*OPT 4 (n) Purpose Changes the auto
Page 54 and 55:
*RUN (parameters to utility) Purpo
Page 56 and 57:
If enough space is available, the i
Page 58 and 59:
Displaying the file using *LIST wil
Page 60 and 61:
*TYPE Purpose Displays a text file
Page 62 and 63:
6 The filing system utilities As ex
Page 64 and 65:
can format a disc in the second dri
Page 66 and 67:
7 Random access files One of the ma
Page 68 and 69:
this case the type is 'string' so t
Page 70 and 71:
The above method will only work con
Page 72 and 73:
A=&80 causes a file to be opened fo
Page 74 and 75:
A=0 Save a section of memory as a n
Page 76 and 77:
On Exit C clear implies a successfu
Page 78 and 79:
10 Error messages &CC Bad filename
Page 80 and 81:
&BD Not enabled An attempt is made
Page 82 and 83:
&07 Number of sectors on disc (8 lo
Page 84 and 85:
12 Filing system command summary Co
Page 86 and 87:
Index Abbreviations 82 *ACCESS 27 A
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