Routines
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28627: Clear Screen
Used by the routine at SquiggleLine.
ClearScreen 28627 PUSH HL Stash HL, DE and BC on the stack.
28628 PUSH DE
28629 PUSH BC
28630 LD A,7 Set the border colour to WHITE.
28632 OUT (254),A
28634 LD HL,16384 Write 0 to 6144 memory locations (clearing the screen buffer).
28637 LD DE,16385
28640 LD BC,6144
28643 LD (HL),0
28645 LDIR
28647 LD BC,768 Write INK: BLACK, PAPER: WHITE to the following 768 memory locations (the attribute buffer).
28650 LD (HL),56
28652 LDIR
28654 POP BC Restore BC, DE and HL from the stack.
28655 POP DE
28656 POP HL
28657 RET Return.
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