Routines
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6910: Screen Address One Pixel Below
Used by the routines at AttributesPlayArea and DrawPlayArea.
Input
HL Current position
Output
HL Address for new position
Calculates the new address for writing a sprite pixel, in an downwards direction.
6910 LD A,L L=L + 20 (one line).
6911 ADD A,$20
6913 LD L,A
6914 LD A,H H=H + 00 (but include the carry from above).
6915 ADC A,$00
6917 LD H,A
6918 RET Return.
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