Commodore Amiga A500 Technical Reference Manual page 183

sists after
8
attempts, an auto-restore is performed, followed by a
reseek, and another
8
attempts to read the desired LSA.
Sector Not Found. Read
(1 3)
The HDC found the correct cylinder and head but not the target sec-
tor.
Sector Not Found, Write
(14)
The HDC found the correct cylinder and head but not the target sec-
tor.
I.D. Not Found (15)
If the ID field cannot be read correctly after all the retries have been
exhausted, this error code is set and the operation terminated. The
WDC searches for the ID field twice, followed by another
8
attempts
by the HDC.
Format Error
(1 A)
During a check track command the HDC detects one of the following
errors:
1) Track not found.
2) Bad ID
Illegal Parameters (20.21, 22)
These error codes, invalid command (20), illegal LSA (21), and illegal
LUN
(22) are self explanatory.
HDC
RAM
Error
(30)
During internal diagnostic the HDC detects a
RAM
error.
HDC ROM Checksum Error (31)
During internal diagnostic the HDC detects a ROM checksum error.
Host DMA Failure
This error code is set whenever invalid status is read from the DMA
during any data or command access. For most operations the status
checked is E0 (hex), except for a block write. In this case the valid
status checked for is AO. The status is read continuously for about
2 0 mS.