Commodore 2040 User Manual page 84

70: NO CHANNEL (available)
The requested channel
is
not available, or all channels are in use. A maximum of five
sequential files may be opened at one time to the DOS. Direct access channels may
have six opened files.
71: DIRgectory) ERROR
The BAM does not match the internal count. There is a problem in the BAM allocation
or the BAM has been overwritten in DOS memory. To correct this problem, reinitialize
the diskette to restore the BAM in memory. Some active files may be terminated by
the corrective action. NOTE: BAM = Block Availability Map
72: DISK FULL
Either the blocks on the diskette are used or the directory is at its limit of 152 entries
for the 2040, 3040, and 4040 or 243 entries for the 8050. DISK FULL is sent when
two blocks are available on the 8050 to allow the current file to be closed.
73: DOS MISMATCH (73, CBM DOS V2.5 8050)
(73, CBM DOS V2 ) for 4040
DOS 1 and 2 are read compatible but not write compatible. Disks may be interchange-
ably read with either DOS, but a disk formatted on one version cannot be written upon
with the other version because the format is different. This error is displayed whenever
an attempt is made to write upon a disk which has been formatted in a non-
compatible format. (A utility routine is available to assist in converting from one for-
mat to another.) This message may also appear after power up.
74: DRIVE NOT READY
An attempt has been made to access the 8050 Dual Drive Floppy Disk without any
diskettes present in either drive.
PATTERN MATCHING
Pattern matching of file names is available on all Commodore floppys. Pattern matching uses
the question mark (?) and the asterisk (*) to perform operations on several files with simi-
lar names.
The asterisk is used at the end of a string of characters to indicate that the rest of the name
is
insignificant. For example:
FIL* could refer to files named
FIL
or FILE1
or FILEDATA
or FILLER
or any other file name starting with the letters FIL.
The question mark may be used anywhere within the string of characters to indicate that
the character in that particular position should be disregarded. For example:
?????.SRC could refer to files named
TSTER.SRC
or DIAGN.SRC
or PROGR.SRC
but not SRC.FILES
85