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ZL4PZ > C64 24.10.03 17:01l 61 Lines 2149 Bytes #999 (0) @ WW
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Page 4 C64 Quick Reference
(7) VALIDATING DISKS:
Sometimes the directory of the disk drive gets a little confused and
starts
losing track of existing blocks of information on the disk. This
happens
after a number of files have been scratched, renamed or copied.
Sometimes it
happens when the disk is nearly full.
The only safe way of fixing up the disk (or to be exact, its Block
Availability
Map = BAM) is to VALIDATE the disk.
OPEN 15,8,15,"V0" [RETURN] (That's V "zero")
CLOSE 15 [RETURN]
(8) ERASING FILES FROM DISKS:
To erase a file (Data or Program) from a disk, we use the SCRATCH
command:
OPEN 15,8,15, "S0:FILE NAME" [RETURN] (That's S "zero")
CLOSE 15 [RETURN]
(9) COPYING FILES TO THE SAME DISK.
This command will copy a file to the same disk drive giving the new
file a
different name.
OPEN 15,8,15, "C0:NEWFILE=0:OLDFILE" [RETURN] (That's C "zero")
CLOSE 15 [RETURN]
(10) RENAMING A FILE:
This command renames the file on the disk and does NOT create a copy of
it.
OPEN 15,8,15,"R0:NEWFILE=0:OLDFILE" [RETURN] (That's R "zero")
CLOSE 15 [RETURN
(11) INITIALISING THE DISK DRIVE:
Some programs can confuse the disk drive by leaving the disk drive head
in a
position on the disk where it is not supposed to be. This usually
happens with
commercial software as part of their copy protection method.
If this should happen, all you have to do is to initialise the disk
drive as
follows;
OPEN 15,8,15, "I0:" [RETURN]
CLOSE15 [RETURN]
(12) WILD CARD CHARACTERS:
There are two Wild Card Characters that can be used with the LOAD,
DIRECTORY, VERIFY and SCRATCH commands. These two characters
are the asterisk (*) and the question mark (?). The asterisk (*) makes
all
characters in and beyond its position WILD while the question mark (?)
only
makes the character in its position WILD.
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