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SCSI PACKETS
7-26
7
Old Packet Supported for Compatibility
(if this is set to 0, the
firmware disables
correction and turns
off retries in the
controller. Also, the
firmware does not
automatically retry
the SCSI command
except
"unit attention" and
"not diagnostics".)
$1C xxxxxxxx xxxxxxxx Physical bytes per
block (MSW) (Note 2)
$1E xxxxxxxx xxxxxxxx Physical bytes per
block (LSW) (Note 2)
$20 xxxxxxxx xxxxxxxx Address of 384-byte
SCSI RAM area
(MSW)
$22 xxxxxxxx xxxxxxxx Address of 384-byte
SCSI RAM area
(LSW)
$24 xxxxxxxx xxxxxxxx Logical bytes per
block must be an
integer multiple of
physical bytes per
block
NOTE
:
1. Refer to Chapter 3.
2. If both are 0 then variable block size mode is used, and the field in the
read/write packet at offset $C is the number of bytes to transfer.
3. Buffered writes are used to allow time for additional data to be
transferred, thus keeping the tape streaming. If non-buffered, controller
returns status only after all data has been written to the tape. If buffered,
controller returns a good status when all data has been transferred to the
buffer, although all data may not yet have been written to the tape.
4. For additional codes, refer to user’s manual for the drive.