User`s manual

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 me to be closed.
73: DOS MISMATCH(73, CBMDOS V2.5 8050)
(73, CBMDOS V2) for 4040
DOS I and 2 are read compatible but not write compatible. Disks may be
interchangeably 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 format 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.
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