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Basic Disk Operating System (BDOS) Functions
4-12
NOTE
Although
CP/M-86
supports up to 16 logical
drives, labelled A through P, the APC is cur-
rently configured for up to only four diskette
drives, A through D and up to four hard disk
drives, E through H. This must be taken into
account throughout this manual for all refer-
ences up to 16 disk drives.
BDOS FILE PROCESSING ERRORS
There are three error situations that the BDOS may encounter during file process-
ing initiated as a result of a BDOS file 1/0 function call. When one of these
conditions is detected, the BDOS issues the following message to the console.
BDOS ERR ON x: error
where
x
is the name of the drive selected when the error condition was detected and
error is one of the following three messages.
BAD SECTOR
SELECT
RIO
These error situations are trapped by the BDOS, temporarily halting the transient
program when the error is detected. No indication of the error situation is returned
to the transient program.
The "BAD SECTOR" error is issued as the result of an error condition returned to
the BDOS from the BIOS module. The BDOS makes BIOS sector read and write
commands as part of the execution of BDOS file-related system calls. If the BIOS
read or write routine detects a hardware error, it returns an error code to the BDOS
resulting in this error message. The operator may respond to this error in two ways:
• CONTROL-C terminates the executing program.
• RETURN instructs CP 1M -86 to ignore the error and allow the program to
continue execution.
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