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Page Title:
Set Position Word - Function Code 01 |
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|  MIL-D-81347C(A3)
Word Formats - The Pilot Display Logic shall be capable of
3.5.3.4.2.4.3
recognizing the digital display Instruction Word formats shown in Figures 119 through 122. All of
these programming words shall be of 30 bit length, with bit "29" being the Most Significant Bit (MSB)
and bit "0" being the Least Significant Bit (LSB). Not all of the data bits contained in the instruction
word are used. In all words, bits 26 through 29 define the function code. The list of display actions
defined by the various function codes is shown in the following table. The function codes `are shown in
octal code representation.
Function Performed
Function Code
No Operation
00
Set Position Location Beam
01
Print 1 character - No 2nd char.
02
Print 2 characters and Point
03
Print Characters - No Point
04
(Type Format)
Display Vector
05
Display Azimuth Vector
06
Display Circle
07
EOD
10
Identical to MODE 02 but flashing
12
Identical to MODE 03 but flashing
13
Identical to MODE 04 but flashing
14
No Operation - Function Code 00 - When a word containing this
3.5.3.4.2.4.3.1
code is received from the computer, the Pilot Display Logic shall inhibit the normal processing of the
word and request a new computer word.
Set Position Word - Function Code 01 - The Set Position word,
3.5.3.4.2.4.3.2
Figure 123, shall contain the X and Y components of the positioning data for all vectors, circles, and
characters. The X compound is contained in bits 15 through 22, where bit 22 is the MSB and bit 15
the LSB. The Y component is contained in bits O through 7, where bit 7 is the MSB and Mt O the LSB.
The eight binary bits of horizontal deflection data and eight binary bits of vertical deflection data shall
be utilized to define a Cartesian coordinate system with the origin at the center of the display. All of
the X and Y coordinate data shall be expressed in the one's complement system. The maximum posi-
tive deflection for the 7.6 inch usable diameter of the 9-inch diameter CRT is defined by 177 in the
octal code; the maximum negative deflection is defined as 200 in the octal code (see Figure 115). The
use of the eight binary bit magnitude in conjunction with the 8-inch usable CRT diameter provides a
plotting position selection capability of approximately 0.0312 inch apart.
Character Word - A character word, Figure 120, shall contain
3.5.3.4.2.4.3.3
one or two character data codes, C1 and C2, Plus the Character Function Code. The Character Func-
tion Code shall describe the manner in which this Character Word is to be processed. Character 2
shall be contained inhibits 15 through 20 where bit 20 is the MSB and bit 15 is the LSB. Character 2
shall be contained in bits 0 through 5, where bit 5 is the MSB and bit 0 is the LSB.
(1) Function Code (02) - This shall be a one character message
pertaining only to special characters. A point shall first b e plotted at the X, Y position contained in
the previous positioning word, and one of the special characters shall then be drawn with its center at
200
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