ASTRO VG-877 - 4.7 SPT [4 BH]: Pattern data registration

332
3.34 WINCLR4 [28H 63H]: Window plane clear
Function: This command clears the window plane.
Sequence: Type 2
Command:
STX
1 byte
02H
VG4CMD
1 byte
FDH
WINCLR4
2 bytes
28H 63H
ETX
1 byte
03H
Fig. 3-34-1