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749C: Clear Screen
ClearScreen 749C LD HL,$4000 HL=4000 (screen buffer location).
749F LD (HL),L Write 00 to *HL.
74A0 LD BC,$1B00 BC=1B00.
74A3 LD D,H DE=HL+01.
74A4 LD E,L
74A5 INC E
74A6 LDIR Copy 00 across both the screen and attribute buffers.
74A8 RET Return.
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