Commodore 2040 User Manual page 82

22: READ ERROR (data block not present)
The disk controller has been requested to read or verify a data block that was not
properly written. This error message occurs in conjunction with the BLOCK commands
and indicates an illegal track and/or sector request.
23: READ ERROR (checksum error in data block)
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 indicate grounding problems.
24: READ ERROR (byte decoding error)
The data or header has been read into the DOS memory, but a hardware error has been
created due to an invalid bit pattern in the data byte. This message may also indicate
grounding problems.
25: WRITE ERROR (write-verify error)
This message is generated if the controller detects a mismatch between the written data
and the data in the DOS memory.
26: WRITE PROTECT ON
This message is generated when the controller has been requested to write a data block
while the write protect switch is depressed. Typically, this is caused by using a diskette
with a write protect tab over the notch.
27: READ ERROR (checksum error in header)
The controller has detected an error in the header of the requested data block. The
block has not been read into the DOS memory. This message may also indicate ground-
ing problems.
28: WRITE ERROR (long data block)
The controller attempts to detect the sync mark of the next header after writing a data
block. If the sync mark does not appear within a pre-determined time, the error
message is generated. The error is caused by a bad diskette format (the data extends
into the next block), or by hardware failure.
29: DISK ID MISMATCH
This message is generated when the controller has been requested to access a diskette
which has not been initialized. The message can also occur if a diskette has a bad
header.
30: SYNTAX ERROR (general syntax)
The DOS cannot interpret the command sent to the command channel. Typically, this
is caused by an illegal number of file names, or patterns are illegally used. For example,
two file names may appear on the left side of the COpy command.
31: SYNTAX ERROR (invalid command)
The DOS does not recognize the command. The command must start in the first
position.
32: SYNTAX ERROR (long line)
The command sent is longer than 58 characters.
33: SYNTAX ERROR (invalid file name)
Pattern matching is invalidly used in the OPEN or SAVE command.
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