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|  MIL-N-85005A(AS)
3.5.5.4.4.3.2 Character 1, 2, 3, and 4 Select - Characters 1, 2,
3, and 4 shall represent the character position within a group of four
characters written from left to right, with Character 1 being the left,
4 the right, and the center of 2 being the marker position as defined by
X and Y position. Each Character Select shall be capable of selecting
any individual character in the character repertoire. The character
repertoire shall consist of 48 characters similar to the 47 shown in the
5 X 7 character font of Figure 28. One spare of the 17 spares shown in
Figure 28 shall be included to form a total of 48 characters (minimum).
*3.5.5.4.4.3.3
Length/Radius - The
length of a bearing line, aircraft
cursor, target predict cursor, or the radius
of a circle to be displayed
The conic origin shall be
on the CRT shall be defined by bits 1 - 12.
defined by the X, Y position with bit weight
as shown in Figure 28.
3.5.5.4.4.3.4 Bearing Sine and Cosine - The bearing from the
origin as defined by the X, Y position, in sine and cosine functions
shall be 9 bits each consisting of 8 bits data and 1 bit for sign. Bits
for sine and cosine, values of LSB and MSB, and sign of sine and cosine
function in degrees shall be as shown in Figure 28.
CMPTR MALF Discrete - A CMPTR MALF discrete shall be
3.5.5.4.4.4
provided from the SDC to the Converter. The Converter shall contain
circuitry to provide continuous monitoring of the computer for anomalies
and to enable malfunction display as described in Paragraph 3.5.5.4.6.
ITADS Status Discrete - The Converter shall set this
3.5.5.4.4.5
discrete false during the "GO" condition and true during the "NO-GO"
condition.
Symbol Generator - The Converter shall generate the
3.5.5.4.5
following symbols for presentation on the CRT.
Symbology - The Converter shall be capable of dis-
3.5.5.4.5.1
playing four characters on the CRT for each position word. The position
data defines the center of the character matrix of the second character.
Characters shall be as defined in Figure 29. Range circles and bearing
lines shall be displayed on any marker. A Malfunction Symbol shall be
provided by the hardware, as detailed in Paragraph 3.5.5.4.6. The
Malfunction Symbol shall be a large "X" positioned in the center of the
CRT. Display of the Malfunction Symbol shall result in removal of all
other symbols.
Accuracy - The accuracy of the Converter is specified
3.5.5.4.5.2
as the error between the digital position, range, or bearing at the
input to the Converter and the analog voltage at the input to the Modified
IP-886B/ASA-66.
(1) The buoy positions shall be within 20 yards on the
2 mile scale.
(2) The range circles shall be within 40 yards on the 2
mile scale.
(3) The bearing lines shall be within 1 degree.
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