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Command OP Code
Description
READ BUFFER 3Ch Copies the tape drive’s microcode across the SCSI
bus to the initiator. Used in conjunction with the
WRITE BUFFER command.
READ POSITION 34h Reports the tape drive’s current logical position but
does not cause tape motion to occur. Used in
conjunction with the LOCATE command.
RECEIVE DIAGNOSTIC
RESULTS
1Ch Reports the results of the tests requested by a
previous SEND DIAGNOSTIC command or to obtain a
trace of SCSI and servo command activity for the tape
drive.
RELEASE UNIT 17h Releases a tape drive from an initiator’s exclusive use,
or if third-party reservations are in effect, from another
SCSI device’s use. Used in conjunction with the
RESERVE UNIT command.
REQUEST SENSE 03h Requests that the tape drive transfer sense data to the
initiator.
RESERVE UNIT 16h Reserves the tape drive for an initiator’s exclusive use,
or if third-party reservations are in effect, for another
SCSI device’s use. Used in conjunction with the
RELEASE UNIT command.
REWIND 01h Causes the tape drive to rewind the tape to the logical
beginning of tape.
SEND DIAGNOSTICS 1Dh Causes the tape drive to perform certain
self-diagnostic tests.
SPACE 11h Enables the tape drive to perform forward or backward
searches.
TEST UNIT READY 00h Allows you to determine if the tape drive is ready to
accept an appropriate medium access command.
VERIFY 13h Enables the tape drive to verify one or more logical
blocks of data on the tape.
WRITE 0Ah Transfers one or more bytes or blocks of data from the
initiator to the tape drive.
WRITE BUFFER 3Bh Allows you to load new microcode from the SCSI bus
into the tape drive’s control memories. Used in
conjunction with the READ BUFFER command.
WRITE FILEMARKS 10h Causes the tape drive to write zero, one, or more
filemarks or setmarks (8500c format) to tape.
May 1994 EXB-8205 and EXB-8505 5-5
(Standard and XL)
5 Interface Specifications