;Available background instructions: E5D7 E5EB E616 E637 E63E E64B E652 E5D9
;Significant note: This is run when the game is unpaused as well as from doors. Though it uses a different jump table at E9D5 instead.

;$165D7-$16658	;0000: End BG_DATA
	SEC
	RTS

;$165D9 ALTERNATE ENTRY POINT	;000E: Copy stuff to VRAM if entered by certain door (2 bytes to check for which door, 3 byte source address, 2 byte VRAM address, 2 byte size)
	LDA $078D
	CMP $0000, Y
	BEQ +
	TYA
	CLC
	ADC #$0009
	TAY
	CLC
	RTS
+
	INY
	INY
;$165EB		;0002: Copy stuff to VRAM every time, 3 byte source address, 2 byte VRAM address, 2 byte size
	LDA $0003, Y
	STA $05BE
	LDA $0000, Y
	STA $05C0
	LDA $0001, Y
	STA $05C1
	LDA $0005, Y
	STA $05C3
	LDA #$8000
	TSB $05BC
-
	BIT $05BC
	BMI -
	TYA
	CLC
	ADC #$0007
	TAY
	CLC
	RTS

;$16616 ALTERNATE ENTRY POINT	;0004: Decompress stuff to RAM. Source address (3 bytes), target address (bank 7E, 2 bytes)
	PHY
	LDA $0000, Y
	STA $47
	LDA $0001, Y
	STA $48
	LDA #$7E00
	STA $4D
	LDA $0003, Y
	STA $4C
	JSL $80B119  ;Decompression routine
	PLA
	CLC
	ADC #$0005
	TAY
	CLC
	RTS

;$16637 ALTERNATE ENTRY POINT	;0006: Clears layer 3 tilemap, I'm guessing. No arguments
	PHY
	JSR $E566	;Set some RAM to #$184E, then copy $0F00 bytes to VRAM at word $5880 (layer 3 alternate tilemap?)
	PLY
	CLC
	RTS

;$1663E ALTERNATE ENTRY POINT	;0008: Always copies data to vram, same arguments as E5EB (02). Also sets layer 3 graphic offset to $2000?
	JSR $E5EB	;Copy stuff to VRAM (part of E5D9)
	SEP #$20
	LDA #$02
	STA $5E		;Layer 3 graphics begin at VRAM word $2000? Not during status bar, of course.
	REP #$20
	CLC
	RTS

;$1664B ALTERNATE ENTRY POINT	;000A: Clears layer 2 tilemap, I'm guessing. No arguments
	PHY
	JSR $E583	;Set some RAM to #$0338, then copy $1000 bytes to VRAM at word $4800 (Layer 2 alternate tilemap)
	PLY
	CLC
	RTS

;$16652 ALTERNATE ENTRY POINT	;000C: Clears stuff. Doesn't look right. Is this ever used?
	PHY	
	JSR $E5A0  ;Set some RAM to #$0338, then copy $1000 bytes to VRAM at word $4000 and word $4800 (Layer 3 graphics and layer 2 alternate tilemap)
	PLY
	CLC
	RTS


;16566:
	LDX #$077E
	LDA #$184E
-
	STA $7E4000, X
	STA $7E4780, X
	DEX
	DEX
	BPL -
	JSR $E039  ;VRAM transfer using arguments after JSR
	DB $00,$40,$7E,$80,$58,$00,$0F
	RTS