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C37D: Advance Screen Position
Used by the routine at UpdateScreenDisplay.
Input
HL Screen position
Output
HL Updated screen position
AdvanceScreenPosition C37D EX DE,HL Exchange the DE and HL registers.
C37E LD A,L
C37F ADD A,$20
C381 LD L,A
C382 RET NC
C383 LD A,H
C384 ADD A,$08
C386 LD H,A
C387 RET
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