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|  MIL-D-81347C(AS)
Binary
27 26 25 24
MSB
Octal
Search File Forward- The selected MTT shall search in the forward
direction for a compare or "find" condition between the Identifier word
and the first word in the block. When a "find" is made, the record is
read in the forward direction. The search shall be terminated by an
error condition or tape mark. At completion a Status word with Inter-
rupt shall be sent to the computer.
Space File - The selected MTT shall move the tape in the forward di-
rection 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 Forward - The selected MTT shall read one record in
the forward direction. At completion a Status word with Interrupt
shall be sent to the computer. -
Loop - This instruction shall test the data transfer paths of the MTC.
One word shall be requested by the MTC and shall be stored in
the word registers. The word shall be transferred back to the computer and then also shall be trans-
ferred through the MTC data paths and again stored in the word registers. The word shall then again
be transferred to the computer.
NOTE
The Repeat Instruction mode is applicable to all
Function Codes except Loop, Status Report, Rewind,
Search, and Master Clear.
Operation - The Operation Code is located in bits 27 to 24 of the
3.5.2.4.1.3.3.2
Instruction word. Legal operation codes exist for the five basic operations of Read, Search-Read,
Write, Space and Rewind. Operation Codes except Rewind, Master Clear, Status Report, and Loop
must be supplemented by Parity and Density codes, placed in bit locations 19 through 21 respectively
of the Instruction word. All instructions except Master Clear, Status Report, and Loop must include
a Tape Transport select bit located in bit positions 17 or 18.
3.5.2.4.1.3.3.2.1
Master Clear - The DMTSS shall perform a Master Clear, when-
ever the power is applied, whenever the Channel Reset switch on the MCP is operated with the MTC in
the Off-Line Mode and whenever the Master Clear Function Code is received via the External Function
command word. The Master Clear shall have the following properties.
(1) The Master Clear shall be accepted by the DMTSS at any
time.
(2) The Master Clear shall be followed by a Status word
Interrupt.
(3) Master Clear shall stop all tape motion, including a rewind-
ing tape, and shall place the DMTSS in the Idle state.
(4) The DMTSS shall accept an External Function command word
any time after a Master Clear provided that the Interrupt has been acknowledged.
3.5.2.4.1.3.3.2.2
Rewind - The selected MTT shall rewind the tape and position the
load point at the load point sensor. The Status Interrupt shall be presented upon initiation of the rewind
and not upon completion of the rewind.
Status Report - The MTC shall transmit to the computer the
3.5.2.4.1.3.3.2.3
stored status report of the selected MTT via the Interrupt control line and 30 data bits.
101
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