Disc System User Guide (1982).

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Notes Permitted values of are 0, 1, 2 or 3 nothing. Other values will cause the message Bad drive to be displayed and you will have to re-enter the command correctly. The top two lines of the catalogue include the disc title, disc option, drive number and current directory. Important The Catalogue and hence the disc will hold up to a maximum of 31 files. 32
*COMPACT Purpose Attempting to SAVE a program or file on to a disc may produce the message '<strong>Disc</strong> full' if there is no single space available on the disc big enough for the information. It may be that there is enough space, but is is split into several small sections. This command appends all spare space on a disc to the end. When you delete a number of files, the spaces they had occupied will probably be distributed over the disc with current files in between them. *COMPACT moves all current files to the 'start' of the disc leaving the spare space in one continuous block at the end. Example *COMPACT 1 $.HELLO 1700 801F 0003B 002 $ . SUMS 1700 801F 00098 003 : : : As 'compacting' proceeds all the current files are displayed in the order in which they occur on the disc. Description Moves all available space on a disc into one continuous block following the current files. Associated commands *SAVE and BASIC's SAVE and OPENIN Notes This facility will only do anything if there is space between the files. There will only be such space if a file has been deleted from between two others. 33
Page 4 and 5: ©© Acorn Computers Ltd 1982 First
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 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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