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|  MIL-N-85005A(AS)
3.5.4.4.2.1.5 Malfunction - The malfunction symbol shall be a
large "X". The "X" shall consist of two 2.0" lines intersecting each
other at 90 degrees. The symbol shall be positioned in the center of
the CRT intersecting the vertical or Y axis of the display at 45 degrees.
Display of the Malfunction symbol shall result in removal of all other
symbols.
3.5.4.4.2.1.6 Priority Fly To - This symbol shall be an *. The *
shall be 0.125 in height and with a width to height ratio of 3:4. See
Figure 16.
Scaling
3.5.4.4.2.2
3.5.4.4.2.2.1 Scale Factor - The scale factor shall be 0.0075
inch/bit and 0.543 inch/volt, nominal. These values are adjustable at
the Display Unit 10%.
3.5.4.4.2.2.2 Sense - The center of display shall be defined as
binary 512 in x = 0 VDC and binary 512 in y = 0 VDC. Increasing count
and voltage shall be defined as upward or to the right from display
center, except for aircraft vector per Figure 14.
Display Parameters - The Control shall provide the
3.5.4.4.2.3
capability to display 15 markers (Figure 17) simultaneously without
perceptible flicker.
3.5.4.4.2.3.1 Brightness - The Control shall provide signals to
the CRT Display Unit (ASA-66A or equivalent - P43 phosphor) such that a
brightness level of 500 foot-lamberts minimum can be achieved by any
symbol.
3.5.4.4.2.3.2 Uniformity - The Control shall provide signals to
the CRT Display Unit such that the display illumination level shall be
uniform within 25% from symbol to symbol.
3.5.4,4.2.3.3 Update Rate - The Control shall update the CRT
Display Unit 40 times/second minimum.
3.5.4.4.3
Input/Output Signal Characteristics - General timing
relationships and signal characteristics shall be as shown in Figure 18.
The Control shall be serviced by the NC on a periodic non-interrupt
basis.
Input Signal Characteristics - The following signals
3.5.4.4.3.1
shall come from the NC via the SDC.
3.5.4.4.3.1.1 Serial Digital Input - The input data, clock, data
enable, output data enable, and output data clock signals shall be
balanced lines with high-noise immunity circuits (Type A9614/9615, or
equivalent).
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