Routines
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33479: ClearTextWindow
Used by the routines at 31417, 32719 and 44815.
33479 LD HL,20576 row 19, col 0: the info/message panel
33482 LD (31257),HL
33485 LD B,128 128 cells = 4 char rows
33487 PUSH BC
33488 XOR A
33489 CALL 31370 DrawTileA(0): blank the cell
33492 LD HL,31257 advance one cell right
33495 INC (HL)
33496 POP BC
33497 DJNZ 33487
33499 RET
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