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|  MIL-D-81347C(AS)
Tape Track
1
2
4
8
A
B
C
Odd
Parity
O
0
0
0
0
0
1
Even
Parity
O
0
0
0
1
0
1
Longitudinal Parity - During a write operation a Longitudinal Even
3.5.2.4.1.3.2.1.2
Parity bit shall degenerated by the MTC for each tape track and shall be recorded after the last frame
of the record. If the MTC detects an error in this parity during a read type operation or during the
post-write check of the record type operation, a Longitudinal Parity Error shall be generated.
Computer Word - Tape Track Formats - The correspondence be-
3.5.2.4.1.3.2.2
tween computer word data and the tape track storage of that data is defined in Figure 58.
Load Point, Tape Marks, Gaps and Density Control - The MTC
3.5.2.4.1.3.2.3
during output, shall determine the delay to allow for a gap of 3-1/ 2 inches beyond the load point marker
(before the first record is written). The End of File mark, the Inter-record Gap, and the Write Density
are also controlled by the MTC.
Tape Transport Control - The MTC shall transfer signals based
3.5.2.4.1.3.2.4
on the Function Code to the selected MTT and monitor the return signals from the MTT to determine
the control sequence. The MTC shall use the Transport Select bits to provide the necessary enable
to select the desired MTT.
Character Count - The MTC shall count the character transfers
3.5.2.4.1.3.2.5
on read and record operations and generate an error if one occurs.
MTT Timing - During output, the MTC shall monitor transport
3.5.2.4.1.3.2.6
status and provide the delay to initiate writing 3-1/2 inches beyond the load point marker before the
first record is written. The MTC shall also provide the delays necessary to record at the normal
Inter -record Gap of 3/4 inch or the extended Inter-record Gap of 3-1/2 inches. During input and output
the MTC shall monitor the End of Tape marker and if no data is received from the MTT for a time cor-
responding to approximately 10 inches of tape after the end of tape, the MTC shall terminate the in-
struction and indicate "EOT" to the computer. No new forward tape motion instructions will be initiated
by the MTC. Prior to the stopping of tape motion, the MTC shall provide timing and control signals
that define the time at which the current instruction is complete, so that the computer may repeat the
current instruction without stopping the tape motion. This shall be designated as the Repeat Instruction
Request Time. While the Function Code must remain identical, the density select and parity select
may be changed with the Repeat Instruction.
Character Loop Gate - The MTC shall provide a character loop
3.5.2.4.1.3.2.7
gate that makes it possible to bypass the MTT on the Loop Instruction.
Function Repertoire Operation
3.5.2.4.1.3.3
Function Code Description - Four bit positions (27 through 24)
3.5.2.4.1.3.3.1
of the Function word form the Function Code. The following describes the functions required.
Function Code
Binary
27 26 25 24
MSB
Octal
Master Clear - This instruction has priority over all others and shall
00
0
0
0
0
terminate all others in process, including Rewind. The Master Clear
places the DMTSS in the idle state and a Status Word with Interrupt is
sent to the computer.
99
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