Routines
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864F: Clear Sprite Scratch
Zero SpriteRowsLeft and SpriteHeight, then XOR the actor's cached sprite onto the screen again (erasing it) through WriteSpriteRow.
Input
IX Actor slot
Before ClearSpriteScratch After ClearSpriteScratch
scratch-drawn scratch-erased
The cached image of the sprite is XORed off the screen, so the pixels of the sprite disappear.
ClearSpriteScratch 864F XOR A Write 00 to
8650 LD ($5E59),A
8653 LD ($5E58),A
8656 LD C,A Clear the row counter and switch register sets.
8657 EXX
8658 CALL LoadSpritePointers Call LoadSpritePointers.
865B JP WriteSpriteRow Jump to WriteSpriteRow.
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