Nightshade: Routine at E4C9

Used by the routines at DRAW_SPRITE and SPRITE_SHIFTED_FOUR.

The row count goes to A', and A takes the row's first buffer byte: the shifted units of SPRITE_SHIFTED_FOUR expect the byte they are finishing to be in A already. The JR's offset is patched by DRAW_SPRITE for every sprite, into the plain run at SPRITE_ALIGNED_RUN or the shifted one at SPRITE_SHIFTED_RUN; as it stands in the listing, an offset of $FE, it is a JR to itself.

Used by the routines at DRAW_SPRITE and SPRITE_SHIFTED_FOUR. The row count goes to A', and A takes the row's first buffer byte: the shifted units of SPRITE_SHIFTED_FOUR expect the byte they are finishing to be in A already. The JR's offset is patched by DRAW_SPRITE for every sprite, into the plain run at SPRITE_ALIGNED_RUN or the shifted one at SPRITE_SHIFTED_RUN; as it stands in the listing, an offset of $FE, it is a JR to itself.
SPRITE_ROW	E4C9	EX AF,AF'	The row count to A'; the row's first buffer byte
	E4CA	LD A,(BC)	The row count to A'; the row's first buffer byte
SPRITE_ROW_0	E4CB	JR SPRITE_ROW_0	The patched JR into one of the runs