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Page Title:
Detailed Description of the Operation of DMTSS |
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|  MIL-D-81347C(AS)
3.5.2.4.1.4.3.10
Low Tape - One Low Tape line indicating that the tape is at a
point in the 100 to 1000 feet remaining range, shall be transmitted from each MTT to the MTC. The
Low Tape line shall be a logical "1" as long as the tape remaining is less than the preset amount.
Tape Remaining - Two Tape Remaining lines, indicating the
3.5.2.4.1.4.3.11
amount of tape remaining from 0 to 2400 feet, shall be transmitted from each MTT to the MTC. These
two lines shall provide an analog voltage to drive a calibrated 0 to 1 ma meter. The MTC shall not
gate this signal with the Select line.
3.5.2.4.1.5
Test Functions - The following functions shall be included in the
Maintenance Control Panel of Logic Unit 2 to be used in conduction with the DMTSS.
3.5.2.4.1.5.1
DMTSS Test - A maintenance (or Off-Line) mode of operation
shall be provided that shall permit complete subsystem testing of the DMTSS independent of the com-
puter. It shall be possible to manually enter a 30-bit Instruction word from the MC P to the MTC. If
the MTC normally requires a data word following the Instruction, the Instruction is placed in a special
set of switches on the MCP and the data word is placed in the MCP data register. In addition to the
normal repertoire of Instructions listed in the Function Code description, the Instruction word shall
include a word count in bit positions 0-8 to specify the number of times a word is to be written or read.
A Timing Error (peculiar to the Off- Line mode) shall be generated if the record which has been read
has fewer or more words than the specified count.
It shall be possible to perform all of the instructions of the MTC
repertoire from the MC P with the options of Single Instruction, Repeat Instruction or Repeat Instrue -
tion with Halt on Error. The MC P shall also include a Cycle Mode. In this mode of operation, the
MTT shall read forward from an end of file until the next end of file is reached and then read reverse
to the initial end of file. The same options of Single Instruction, Repeat Instruction or Repeat Instruc-
tion with Halt on Error shall be possible. If the MCP operating mode selection switch is in the normal
or On-Line mode, actuation of any of the MCP switches used for maintenance shall not have any effect
on DMTSS operation.
MTC Test - A maintenance mode of operation shall be provided
3.5.2.4.1.5.2
that shall pemit testing of the MTC independent of the computer and the MTT. It shall be possible to
single step, by means of manual execution of MTC test mode operations, the control logic and data
transfers of the MTC through the logic steps associated with all of the instructions of the DMTSS re-
pertoire. The loop gates shall be active in this mode to bypass the MTT and the source of data shall
be the MCP.
MTT Test - A maintenance mode of operation shall be provided
3.5.2.4.1.5.3
that shall allow the MTC to control the MTT independent of the computer. This mode of operation
shall make it possible to write or read continuously with an End of Tape terminating the operation in
the forward direction. It shall also be possible to select sequences of Forward-Stop operation,
Reverse- Stop operation and Forward Stop Reverse operation with the drive command times and stop
times determined by selection switches on the MCP. The selectable drive command and stop times
shall be 5, 10, and 320 milliseconds. Test points shall be provided that will permit oscilloscope
synchronizing and display of drive commands and internal test signals.
MTT Display and Selection - Logic Unit 2 shall include a contin-
3.5.2.4.1.5.4
uous display of the three MTT status conditions of Ready, Load Point and Write Lockout. It shall
include two calibrated meter displays of tape remaining from O to 2400 feet.
MTT Address Selection - Logic Unit 2 shall include one two-
3.5.2.4.1.5.5
position Address switch to change the address selection of the MTT.
Detailed Description of the Operation of DMTSS
3.5.2.4.1.6
Idle State - In the idle state the MTC will contain the Status infor-
3.5.2.4.1.6.1
mation of the previously executed instruction. If the MCP is in the normal or On-Line mode, the MTC
110
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