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|  MIL-D-81347C(AS)
Binary
27 26 25 24
MSB
Octal
Rewind - The selected MTT shall rewind the tape to load point. The
Status Word with Interrupt shall be sent to the computer after the MTC
initiates the rewind, not at the completion of the rewind.
Status Report - The status of the selected MTT shall be stored in the
status register and a Status word with Interrupt shall be sent to the
computer. No tape movement shall occur.
Write - The selected MTT shall write in the forward direction at the
bit packing density specified by the Function word. At completion of
the instruction a Status word with Interrupt shall be sent to the com-
puter.
Write Extended Record Gap - The selected MTT shall write in the
forward direction at the bit packing density specified by the Function
word. The Interrecord Gap shall be increased from the normal 3/4
of an inch to 3-1/2 inches; at completion, a Status word with Interrupt
shall be sent to the computer.
Write Tape Mark - The selected MTT shall write in the forward di-
rection the fixed format tape mark adding a normal record gap. At
completion of the Instruction a Status word with Interrupt shall be sent
to the computer.
Write Tape Mark - Extended Record Gap - The selected MTT shall
write in the forward direction the fixed format tape mark. The Inter-
record Gap shall be increased from the normal 3/4 inches to 3-1/2
inches. At completion a Status word with Interrupt shall be sent to
the computer.
- The selected MTT shall move the tape in the
Backspace Record
reverse direction to
the next Interrecord Gap. The tape shall be
properly positioned
in the Interrecord Gap for reading or writing. At
completion a Status
word with Interrupt shall be sent to the computer.
Search File Reverse - Read Record Forward - The selected MTT shall
search in the reverse direction for a compare or "find" condition be-
tween the Identifier word and the first word in the record. (Last word
read reverse). When a "find" is made, the record is read in the for-
ward direction. The search shall be terminated by an error condition
or tape mark; at completion a Status word with Interrupt shall be sent
to the computer.
Backspace File - The selected MTT shall move the tape in the reverse
direction to the Interrecord Gap beyond the next tape mark. At com-
pletion a Status word with Interrupt shall be sent to the computer.
Read Record Reverse - The selected MTT shall read one record in the
reverse direct ion. Character order within each computer word shall
be in correct order. At completion a Status word with Interrupt shall
be sent to the computer.
Space Record - The selected MTT shall move the tape in the forward
direction to the next Interrecord Gap. The tape shall be properly po-
sitioned in the Interrecord Gap for reading or writing. At completion
a Status word with Interrupt shall be sent to the computer.
100
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