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|  MIL-D-81347C(AS)
(8) Illegal Operation
(9) Improper Frame Count
(10)
Fault
(11) Lateral Parity Error
(12)
Longitudinal Parity Error
(13) Timing Error
Read Function Termination - The MTC after sensing the End of
3.5.2.4.1.3.3.2.14.3
Record shall place a Status word on the input lines and generate an External Interrupt to the computer.
The Status word shall contain either Normal Completion or all Error indications encountered during
the read operation.
L o o p - This instruction shall test the data transfer paths of the
3.5.2.4.1.3.3.2.15
MTC. One word shall be requested by the MTC. The word shall be stored in the MTC word registers
and transferred back to the computer from storage. The word shall then be routed through the MTC
data paths (bypassing the data line drivers and input amplifiers) and back to the word register. It shall
then be transferred back to the computer. (The computer receives two words back). At completion a
Status word with Interrupt shall be sent to the computer.
Interrupts - The MTC shall be provided with the facility for in-
3.5.2.4.1.3.3.3
terrupting computer operation for any of several reasons. These include normal answers to Function
commands to notify the computer of the completion of that Function, Equipment Status, and Error Codes
to indicate faults which will affect subsystem operation. The computer shall be interrupted after the
completion of every operation performed by the MTC. The MTC shall place the Status word on the
channel input lines and raise the External Interrupt Line. The bit structure of the Status word will
enable the computer program to determine the status of the MTC and whether or not the requested
operation was successfully completed. Any such Interrupt sent to the computer must be acknowledged
by the computer before another External Function with an Instruction word, other than a Master Char,
will be accepted by the MTC. A description of each Interrupt follows: (Appendix I contains a detailed
description of the computer interrupt schemes).
3.5.2.4.1.3.3.3.1
Status Word Format
Bit Location
Function
0
Normal Completion
1
Rewinding
2
End of File
3
End of Tape Warning
4
Load Point
5
Low Tape Warning
6
Write Lockout
7
Illegal Instruction
8
Illegal Operation
9
Improper Frame Count
105
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