ZiLOG Z80-RIO Operating System User's Manual page 164

READ AND DELETE READ AND DELETE
Possible errors:
All DISK ERRORS are possible. In addition,
PROTECTION (code C3) will be returned by ZDOS
if the file is write- or erase-protected.
END OF FILE (code
C8) -
the last record of the
file was read without exhausting the length
specification. The number of bytes read is
returned in the length field, and the next
record pointer is null.
POINTER ERROR (code CA) - a pointer mismatch
occurred in going from one record to the next.
The data transfer stops with the record in
error. The length field indicates how many
bytes were transferred prior to the error.
FILE NOT OPEN (code
CB) -
the logical unit
being requested is not active. No action is
taken.
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