Emerson MVME147 manual if this is set to 0, the

7

SCSI PACKETS

				(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.

Old Packet Supported for Compatibility

7-26