Lunar Jetman: Routine at 85D9

85D9: Shift Old Sprite Pair

Copy of 861E for the old sprite. The self-modified jump at XORSpriteLoop_Shift lands in this run of shifts, which push the graphic pair into pixel alignment before it is XORed onto the screen.
ShiftOldSpritePair	85D9	ADD HL,HL	Shift the pair left through A.
	85DA	ADC A,A
	85DB	ADD HL,HL
	85DC	ADC A,A
	85DD	ADD HL,HL
	85DE	ADC A,A
	85DF	ADD HL,HL
	85E0	ADC A,A
	85E1	ADD HL,HL
	85E2	ADC A,A
	85E3	ADD HL,HL
	85E4	ADC A,A
	85E5	ADD HL,HL
	85E6	ADC A,A
	85E7	EX DE,HL	Switch the shifted pair into DE.
XOR three bytes onto the screen, then move up one pixel.
ShiftOldSpritePair_XOR	85E8	EX (SP),HL	XOR A, D and E onto the screen at HL and restore the graphic pointer.
	85E9	XOR (HL)
	85EA	LD (HL),A
	85EB	INC L
	85EC	LD A,D
	85ED	XOR (HL)
	85EE	LD (HL),A
	85EF	INC L
	85F0	LD A,E
	85F1	XOR (HL)
	85F2	LD (HL),A
	85F3	POP DE
	85F4	DEC L
	85F5	DEC L