User guide

Appendix B. Corvus Disk Error Codes
(text
of CERROR.DOC file from
CORVUS UTILITIES DISKETTE VOL. 1)
Corvus Disk Error Codes
The Corvus controller has a number of error codes that may be
issued if either an illegal command is given, or the controller is
out of synchronization, or there is a hardware malfunction. A number
of the utilities and disk interface programs can list these error codes
(in hex)
if such an error occurs. For example, PUTGET.COM may
list the code as:
**
DISK R/W ERROR # XXH **
where
XX is the error code. You can demonstrate this by trying to
read a sector (with PUTGET) from drive 4
(unless you have four
drivers). This will give error code A7H. The upper 3 bits of the error
code have the
following significance:
BIT 5 Set if there was a recoverable error (as in a re-try
or read or write).
BIT 6 Set if an error occurred on a re-read (verification)
following a disk write.
BIT 7 Set if any fatal error has occurred.
NOTE: Most
of the programs will not list the error
unless bit 7 is set.
The lower 5 bits have the following significance:
BITS 0-4 MEANING
o Disk Header Fault
1 Seek Ti meout
2
Seek Fault
3 Seek Error
4 Header
CRC Error
5 Re-zero (Head)
Fault
6 Re-zero Timeout
7 Drive Not On Line
8 Write
Fault
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