; A very simple SNES init routine
; For serious use, you probably want to do more than this
; This is simple and understandable, though
; Will leave you in A8 XY16 mode

; Disable interrupts and enable native (i.e. not 6502-emulating) mode
sei
clc
xce
cld

setAXY16

; ZeroCPU registers NMITIMEN through MEMSEL
stz $4200
stz $4202
stz $4204
stz $4206
stz $4208
stz $420A
stz $420C

lda #$0080
sta INIDISP ; Turn off screen ("forced blank")

; Zero some registers used for rendering
stz OAMADDL
stz BGMODE
stz BG1SC
stz BG3SC
stz BG12NBA
stz VMADDL
stz W12SEL
stz WH0
stz WH2
stz WBGLOG
stz TM
stz TMW

; Disable color math / etc
ldx #$0030
stx CGWSEL
ldy #$00E0
sty COLDATA

setA8

; Zero window masks
stz WOBJSEL