User`s guide

In nonbanked systems, file passwords and XFCBs are not supported. Thus, if the
Delete function is called with interface attribute f5' set to true, the Delete function
performs no action but returns with register A set to zero.
Upon return, the Delete function returns a Directory Code in register A with the
value 0 if the delete is successful, or OFFH, 255 Decimal, if no file that matches the
referenced FCB is found. Register H is set to zero in both of these cases. If a physical,
or extended error is encountered, the Delete function performs different actions
depending on the BDOS error mode (see Function 45). If the BDOS error mode is
the default mode, a message identifying the error is displayed at the console and the
calling program is terminated. Otherwise, the Delete function returns to the calling
program with register A set to OFFH and register H set to one of the following
physical or extended error codes:
01 : Disk I/O error
02 : Read-Only disk
03 : Read-Only file
04 : Invalid drive error
07 : File password error
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BDOS Function Calls CP/M 3 Programmers Guide