Routines
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FC5B: 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 FC5B INC H
FC5C LD A,H
FC5D AND $07
FC5F RET NZ
FC60 LD A,L
FC61 ADD A,$20
FC63 LD L,A
FC64 JR C,ScrollWindow_NextLine_0
FC66 LD A,H
FC67 SUB $08
FC69 LD H,A
ScrollWindow_NextLine_0 FC6A XOR A
FC6B RET
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