Vera Cruz (Part 2): Routine at FCF4

FCF4: Scroll Window: Next Pixel Line

Used by the routine at ScrollWindow_Scroll.

Moves HL down one pixel line on the screen.

Input
HL	Screen address

ScrollWindow_NextLine

FCF4

INC H

FCF5

LD A,H

FCF6

AND $07

FCF8

RET NZ

FCF9

LD A,L

FCFA

ADD A,$20

FCFC

LD L,A

FCFD

RET C

FCFE

LD A,H

FCFF

SUB $08

FD01

LD H,A

FD02

RET