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|  MIL-D-81347C(AS)
(2) Type Spacing Switches - The MPD Logic shall receive two
switch information bits from the Horizontal and Vertical Type Spacing switches located on the Main-
tenance Control Panel.
(3) Test Mode Switches - The Entry Mode operation shall en-
able the MPD Logic to receive data from the Maintenance Control Panel via the MCP Data Register
pushbuttons. The logic operates on the data once every 25 milliseconds. For operations which nor-
mally require two words, the Test Mode Switch located on the Maintenance Control Panel, is set to
the desired position (Plot or Analog, Vector, and Type) and only the second word need be entered into
the pushbutton switches. For Conies, the second and third words may be transferred to the Function
Generator with the Conic 1 and Conic 2 buttons.
(4) Reset, Request Word, Sync and Load Conic Switches - The
MPD Logic shall receive switch position information lines from Reset, Request Word, Sync and Conic
switches located on the Maintenance Control Panel.
(5) Verify Switch - In the Verify mode of operation, the logic'
shall perform in exactly the same manner as the On-Line mode, except for the following: The Output
Data Request line is controlled by a Request Word pushbutton at the Maintenance Control Panel in
order that only one operation can be performed at a time. A consequence is that the 40 or 57.1 Hz
Line Sync is no longer effective. In this mode the Maintenance Control Panel shall store each com-
puter word and display the word on the panel. A Reset pushbutton shall be provided on this panel to
extinguish the lamps. The MPD Logic shall not act on this data.
(6) Clock - The MPD Logic shall receive a 2.000 MHz square
wave from the MTL. This signal shall be used to time logic operations within the MPD Logic.
Master Timing Logic - Signals between the MPD Logic and MTL
3.5.3.4.1.4.1.2
shall be as follows:
(1) 40 or 57.1 Hz Sync - The MPD Logic shall receive a 40 Hz or
57.1 Hz Sync pulse from the MTL via the MCPL. This signal is used for Frame Sync of the MPD Logic.
(2) Analog Enable - The MTL shall transmit two Analog Enable
signals to the MPD Logic. These signals are used by the MPD Logic to generate Analog Enable signals
which are sent to the MPD.
(3) Channel Enable - The MPD Logic shall transmit two Channel
Enable signals to the MTL. These signals are used to inform the MTL when to enable the Radar and
Spare Scan Converters.
(4) One Hz Flash - The MPD Logic shall receive a one Hz square
wave from the MTL. This signal and the Flash bit received from the computer are used by the logic
to generate a blinking character on the MPD.
(5) LLLTV Active - The MPD Logic shall transmit the LLLTV
signal to the MTL.
This signal shall select display/computer synchronization to be either at a 40 or
57.1 Hz frame rate.
Multipurpose Display - Signals between the MPD Logic and MPD
3.5.3.4.1.4.1.3
shall be as follows: -
(1) Vertical Position - The MPD Logic shall transmit a nine-
bit parallel word representing the vertical position, center 000000000, binary count toward top of
screen. one's complement toward bottom. Figure 94 illustrates the display screen and the octal count
of the various positions.
165
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