ASTRO VG-871 - DISPHV [28 H]: Display Dot Count Readout

Chapter 4 INDIVIDUAL FORMATS FOR CONTROL COMMANDS
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4.22 DISPHV [28H]: Display dot count readout
Function: This command reads the number of display dots on the graphic plane.
Sequence: Type 3
Command:
STX
1 byte
02H
DISPHV
1 byte
28H
ETX
1 byte
03H
Fig. 4-22-1
Data:
STX
1 byte
02H
TRDT
1 byte
10H
Number of H display dots
4 bytes
Sequence of digits from top: 10
3
, 10
2
, 10
1
, 10
0
Number of V display dots
4 bytes
Sequence of digits from top: 10
3
, 10
2
, 10
1
, 10
0
ETX
1 byte
03H
Fig. 4-22-2