Routines
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FCDE: Scroll Window: Screen Address
Used by the routine at ScrollWindow_Scroll.
Returns the screen address of pixel line C, column B.
Input
B Column
C Pixel line
Output
HL Screen address
ScrollWindow_ScreenAddress FCDE LD A,C
FCDF AND $C0
FCE1 RRCA
FCE2 RRCA
FCE3 RRCA
FCE4 ADD A,$40
FCE6 LD H,A
FCE7 LD A,C
FCE8 AND $07
FCEA ADD A,H
FCEB LD H,A
FCEC LD A,C
FCED RLCA
FCEE RLCA
FCEF AND $E0
FCF1 OR B
FCF2 LD L,A
FCF3 RET
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