ASTRO VG-877 - 3.16 GRAPSET4 [28 H 41 H]: Graphic Plane Dot Drawing

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3.2 CHAPSET4 [28H 21H]: Character plane dot drawing
Function: This command draws one dot on the character plane.
Sequence: Type 2
Command:
STX
1 byte
02H
VG4CMD
1 byte
FDH
CHAPSET4
2 bytes
28H 21H
X coordinate
1 to 4 bytes
“0” to “4095”
,
1 byte
2CH (Delimiter)
Y coordinate
1 to 4 bytes
“0” to “4095”
,
1 byte
2CH (Delimiter)
Drawing mode
1 byte
“0” = Clear, “1” = Set
ETX
1 byte
03H
Fig. 3-2-1
When the drawing mode setting is omitted as below, the dot is drawn in the Set mode.
STX
1 byte
02H
VG4CMD
1 byte
FDH
CHAPSET4
2 bytes
28H 21H
X coordinate
1 to 4 bytes
“0” to “4095”
,
1 byte
2CH (Delimiter)
Y coordinate
1 to 4 bytes
“0” to “4095”
ETX
1 byte
03H
Fig. 3-2-2