Nightshade: Routine at E4A7

E4A7: The rest of the byte-aligned run

The units from the fourth byte from the end, the way in for a sprite four bytes wide, to the last, which jumps on to the step to the next row (SPRITE_NEXT_ROW, in SPRITE_SHIFTED_FOUR).
SPRITE_ALIGNED_FOUR	E4A7	POP DE	The fourth byte from the end: the next mask and image; the buffer byte cleared under the mask, the image put in; on to the next byte
	E4A8	LD A,(BC)
	E4A9	CPL
	E4AA	OR E
	E4AB	CPL
	E4AC	OR D
	E4AD	LD (BC),A
	E4AE	INC BC
	E4AF	POP DE	The third
	E4B0	LD A,(BC)
	E4B1	CPL
	E4B2	OR E
	E4B3	CPL
	E4B4	OR D
	E4B5	LD (BC),A
	E4B6	INC BC
	E4B7	POP DE	The second
	E4B8	LD A,(BC)
	E4B9	CPL
	E4BA	OR E
	E4BB	CPL
	E4BC	OR D
	E4BD	LD (BC),A
	E4BE	INC BC
	E4BF	POP DE	The last, with no INC BC
	E4C0	LD A,(BC)
	E4C1	CPL
	E4C2	OR E
	E4C3	CPL
	E4C4	OR D
	E4C5	LD (BC),A
	E4C6	JP SPRITE_NEXT_ROW	To the step to the next row