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|  MIL-D-81347C(AS)
(2) Horizontal Position - The MPD Logic shall transmit a nine
bit parallel word representing the horizontal position, center 000000000, binary count toward the
right of screen, one's complement toward the left.
(3) Character Select - The MPD Logic shall transmit a six bit
parallel word representing one of a possible 64 characters to be displayed on the MPD. Figure 94
illustrates the octal code of the various characters.
(4) Character, Vector, and Cursor Unblank - The MPD Logic
shall transmit to the MPD three lines for the unblinking of the MPD screen.
(5) Focus - The MPD Logic shall transmit to the MPD three
parrel lines containing analog or vector, character, and cursor focus data.
(6) Enable Analog Deflection - The MPD Logic shall transmit to
the MPD four lines to inform the MPD which of the four analog deflection channels to display on the
screen.
(7) Enable Analog Video - The MPD Logic shall transmit to the
MPD four lines to inform the MPD which of the four analog video channels to display on the screen.
Operation Mode Switch - The MPD Logic shall receive from
(8)
the MPD console three lines that contain information as to the position of the Operation Mode Switch.
The codes for this switch shall be as shown below, where switch closure represents a logical "1".
Switch Position Label
Switch Code
Switch Position
1
On-Line
000
2
Off-Line/Analog
001
010
Matrix Test Pattern
3
Registration Test Pattern
011
4
100
5
Vector Test Pattern
101
6
Type Test Pattern
110
Function Generator Test Pattern
7
111
Analog Channel Enable
8
(9) Off-Line/Analog Mode Switch - The MPD Logic shall receive
from the MPD console two parallel lines that inform the logic as to the position of the Off-Line/Analog
Mode Switch. The codes for this switch shall be as shown below, where switch closure represents a
logical "l".
Switch Code
Switch Position Label
Switch Position
00
1
Channel 1
01
Channel 2
2
10
3
Channel 3
11
4
Channel 4
(10) Switch Common - The MPD Logic shall provide a reference
line for the Operation Mode and Off-Line/Analog Switches.
(11) Overflow Indicator - The MPD Logic shall provide to the
MPD two lines for overflow indication.
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