Routines
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E596: HL = HL + A
Used by the routines at NEW_GAME, DRAW_VILLAINS, PLAY_NOTE, PUT_TILE, KNIGHT_THROWS and TURN_SPRITE.
A is treated as unsigned. A is left holding H. The same as the earlier games'.
Input
A The number to add
HL The number to add it to
Output
HL The sum
ADD_HL_A E596 ADD A,L
E597 LD L,A
E598 LD A,H
E599 ADC A,$00
E59B LD H,A
E59C RET
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