Commodore Plus 4 - DOS ERROR MESSAGES

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DESCRIPTION
OF
DOS
ERROR
MESSAGES
These error messages are returned through the DS and DS$
reserved variables.
NOTE: Error message numbers less than 20 should be ignored
with the exception of 01, which gives information aboul the num
ber of files scratched with the SCRATCH command.
20
21
22
23
~
24
READ ERROR
(block header not found)
READ ERROR
(no sync character)
READ ERROR
(data block not present)
READ ERROR
(checksum error
in data block)
READ ERROR
(byte decoding error)
The disk controller is unable to lo
cate the header of the requested
data block. Caused by an illegal
sector number, or the header has
been destroyed.
The disk controller is unable to
detect a sync mark on the desired
track. Caused by misalignment of
the read/writer head, no diskette
is present, or unformatted or im
properly seated diskette. Can
also indicate a hardware failure.
The disk controller has been re
quested to read or verify a data
block
that was not properly writ
ten. This error message occurs
in conjunction with the BLOCK
commands and indicates an ille
gal track and/or sector request.
This error message indicates that
there is an error in one or more of
the data bytes. The data has been
read into the DOS memory, but
the
checksum over the data is in
error. This message may also in
dicate grounding problems.
The data or header has been read
into the DOS memory, but a hard
ware error has been created due
to an invalid bit pattern in the data
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