Routines
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64603: Scroll Window: Next Pixel Line
Used by the routines at DisplayFrame and ScrollWindow.
Moves HL down one pixel line on the screen. Returns with the zero flag set when a new character row has been entered.
Input
HL Screen address
ScrollWindow_NextLine 64603 INC H
64604 LD A,H
64605 AND 7
64607 RET NZ
64608 LD A,L
64609 ADD A,32
64611 LD L,A
64612 JR C,ScrollWindow_NextLine_0
64614 LD A,H
64615 SUB 8
64617 LD H,A
ScrollWindow_NextLine_0 64618 XOR A
64619 RET
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