Martianoids: Routine at 46770

46770: Move Down Row

Moves down by one character row in the display file.

Input
HL	Screen address

Output
HL	Screen address one character row down

MoveDownRow

46770

LD A,L

Add 32 to the low byte of the address.

46771

ADD A,32

46773

LD L,A

46774

RET NC

Return if that did not move into the next third of the display.

46775

LD A,H

Otherwise move on to the next third.

46776

ADD A,8

46778

LD H,A

46779

RET

Return.

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