Commodore 128 Programmer's Reference Manual page 659

APPENDIXES 649
f \
ERROR
NUMBER ERROR MESSAGE AND DESCRIPTION
27 READ ERROR
This message is generated when a checksum error has been detected in the
header of the requested data block. The block has not been read into DOS
memory.
28 WRITE ERROR
This error message is generated when a data block is too long and
overwrites the sync mark of the next header.
29 DISK ID MISMATCH
This message is generated when the controller has been requested to access
a diskette that has not been initialized or improperly formatted. 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
that are illegally used. For example, two file names 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 (invalid command)
The command sent is longer than 58 characters. Use abbreviated disk
commands.
33 SYNTAX ERROR (invalid file name)
Pattern matching is invalidly used in the OPEN or SAVE command. Spell
out the file name.
34 SYNTAX ERROR (no file given)
The file name was left out of the command or the DOS does not recognize
it as such. Typically, a colon(:) has been left out of the command.
39 SYNTAX ERROR (invalid command)
This error may result if the command sent to the command channel
(secondary address 15) is unrecognized by the DOS.
50 RECORD NOT PRESENT
Result of disk reading past the last record through INPUT# or GET#
commands. This message will also appear after positioning to a record
beyond end-of-file in a relative file. If the intent is to expand the file by
adding the new record (with a PRINT# command), the error message may
be ignored. INPUT# and GET# should not be attempted after this error is
detected without first repositioning.