AT&T PC 6300 - Page 354

DIAGNOSTICS
Status words may also be displayed to aid in fault isolation. The
status words for the MFD Unit (800 series) tests are listed in
Figure 4-7.
STATUS WORD
MEANING
%0080
Time Out (Drive failed to respond)
%0040
Bad Seek (Seek operation failed)
%0020
Bad 765 (765 Controller has failed)
%0010
Bad CRC (Bad CRC on diskette read)
%0009
DMA Boundary (Attempt to DMA across
64-KB boundary)
%0008
Bad DMA (DMA overrun on operation)
%0004
Record not fnd (Requested sector
not found)
%0003
Write Protect (Write attempted on
write-protect .disk)
%0002
Bad Addr Mark (Address Mark not found)
%0001
Bad Cmd (Bad command passed to
diskette I/O)
Figure 4-7. Floppy Disk Status Word Meanings
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