Routines
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7C44: Clears the lower third screen area.
Used by the routine at Vectors.
Screen_ClearLowerThird 7C44 XOR A
7C45 OUT ($FE),A
7C47 LD HL,$5000
7C4A LD (HL),$00
7C4C LD E,L
7C4D LD D,H
7C4E INC DE
7C4F LD BC,$07FF
7C52 LDIR
7C54 LD HL,$5A00
7C57 LD (HL),$07
7C59 LD E,L
7C5A LD D,H
7C5B INC DE
7C5C LD BC,$00FF
7C5F LDIR
7C61 RET
7C62 DEFB $00 Store
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