.if !BUILD_NSF

; PPU
PPUCTRL   = $2000
PPUMASK   = $2001
PPUSTATUS = $2002
SPRADDR   = $2003
SPRDATA   = $2004
PPUSCROLL = $2005
PPUADDR   = $2006
PPUDATA   = $2007
SPRDMA    = $4014

PPUCTRL_NMI	= $80
PPUMASK_BG0	= $0A
PPUCTRL_8X8	= $00
PPUCTRL_8X16	= $20
PPUMASK_SPR	= $14
PPUMASK_BG0CLIP	= $08

.endif

; APU
SNDCHN  = $4015
JOY1    = $4016
JOY2    = $4017
SNDMODE = $4017

SNDMODE_NOIRQ	= $40

; Temporaries 
temp   = $A
temp2  = $B
temp3  = $C
addr   = $E

.macro init_nes
	; Init NES
	sei
	cld
	ldx #$FF
	txs
	lda #0
	
.if !BUILD_NSF
	; Init PPU
	sta PPUCTRL
	sta PPUMASK
.endif

	; Clear RAM
	ldx #7	; last page
	tay	; offset in last page+1
	sta <0
@clear_page:
	stx <1
:	dey
	sta (0),y
	bne :-
	dex
	bpl @clear_page
	
.if !BUILD_NSF
	; Let PPU initialize
:	bit PPUSTATUS
	bpl :-
:	bit PPUSTATUS
	bpl :-
.endif
.endmacro