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|  MIL-D-81347C(AS)
Timing Error - This Status bit shall indicate a Timing Error in
3.5.2.4.1.3.3.3.15
the computer MTC interface. If the computer does not send at least one word in a Write operation, if
the computer does not accept the Data word on a Read operation before the next word must-be trans-
ferred, or if the computer does not send the Identifier word on search before data is received from the
MTT, the Timing Error Status bit shall be set.
Master Clear - This Status bit shall indicate that a Master Clear
3.5.2.4.1.3.3.3.16
function has been performed.
No Compare - This Status bit shall indicate that the data sent
3.5.2.4.1.3.3.3.17
through the data paths in the loop instruction is not identical to the data received from the data paths.
3.5.2.4.1.3.3.4
Interrecord Gap (IRG) - Normal Interrecord Gap shall be a
nominal 3/4 inch in length. Actual length is 0.75 inch + 0.157 inch -0.125 inch.
Extended Interrecord Gap (XIRG) - The Extended Interrecord Gap
3.5.2.4.1.3.3.4.1
shall be a nominal 3-1/2 inches in length. Actual length is 3.4 inch l 0.90 inch.
,
3.5.2.4.1.3.3.5
Density Designator - Bits 20 and 21 of all Function Codes except
Rewind shall indicate the density at which the data was recorded.
Low Density - 200 bits per inch shall be indicated by "0's''inbit
3.5.2.4.1.3.3.5.1
positions 20 and 21.
Medium Density - 555.5 bits per inch shall redesignated by a
3.5.2.4.1.3.3.5.2
"l" in bit position 20 and a "O" in bit position 21.
High Density - 800 bits per inch shall redesignated by a "1"in
3.5.2.4.1.3.3.5.3
bit positions 20 and 21.
Lateral Parity Designator - Bit position 19 designates the Lateral
3.5.2.4.1.3.3.6
Parity. A "1''select so odd parity(total number of "1's''in a frame is odd). A "0''s elects even parity
(total number of "1 `s" in a frame is even).
3.5.2.4.1.3.3.7
Tape Format - Refer to Figure 59.
3.5.2.4.1.4
Interface Requirements
3.5.2.4.1.4.1
Computer/DMTSS - Communications between the DMTSS and the
computer shall be via the Maintenance Control Panel Logic and in accordance with Appendix I and
Maintenance Control Panel (3.5.2.4.6). The following lines will originate at the computer (via the
MCPL) and terminate at the MTC.
(1) 1 Interrupt Enable
(2) 1 External Function
(3) 1 Input Acknowledge
(4) 1 Output Acknowledge
(5) 30 Output Data Lines
The following lines will originate at the MTC and terminate at the computer:
(1) 30 Input Data Lines
(2) 1 Output Data Request
107
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