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|
; TLL - A version of the Spectrum game TLL for the Super Nintendo
;
; Copyright (C) 2018 Ian Cowburn (ianc@noddybox.co.uk)
;
; This program is free software: you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation, either version 3 of the License, or
; (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program. If not, see <http://www.gnu.org/licenses/>.
;
; -------------------------------------------------------------------------
;
; Main
;
processor 65c816
option output-file,"main.lib"
option output-format,lib
option +address24
org $8000
bank 0
; Initialise SNES
;
include "snes.inc"
include "macros.inc"
import "tiles.lib",labels
import "maps.lib",labels
sei
clc
xce
INDEX16
ldx #$1fff
txs
ACC8
INDEX8
jsr InitSNES
cli
; Clear VRAM
;
lda #$80
sta VMAIN
stz VMADDL
stz VMADDH
DMA 9,zero,$18,0
; Clear OAM
;
ClearOAM:
stz OAMADDL
stz OAMADDH
INDEX16
ldx #0
.loop
stz OAMDATA
stz OAMDATA
inx
cpx #544/2
bne loop
INDEX8
; Copy 4-colour tiles
;
stz VMADDL
stz VMADDH
DMA 1,Col4Tiles,$18,Col4TilesLen
; Copy 16-colour tiles
;
stz VMADDL
lda #$10
sta VMADDH
DMA 1,Col16Tiles,$18,Col16TilesLen
; Copy sprites
;
stz VMADDL
lda #$a0
sta VMADDH
DMA 1,SpriteData,$18,SpriteDataLen
; Copy palette
;
stz CGADD
DMA 0,PaletteData,$22,PaletteDataLen
lda #$80
sta CGADD
DMA 0,PaletteData,$22,PaletteDataLen
; Copy BG3
;
copybg3:
INDEX16
ldx #$0
ldy #32*32
stz VMADDL
lda #$40
sta VMADDH
.loop
lda BG3Map,x
sta VMDATAL
lda #$20
sta VMDATAH
inx
dey
bne loop
INDEX8
; Initialise the screen
;
lda #$09
sta BGMODE
lda #$1f
sta TM
lda #$11
sta BG12NBA
stz BG34NBA
lda #$61
sta BG1SC
lda #$81
sta BG2SC
lda #$40
sta BG3SC
lda #-52
sta BG3HOFS
stz BG3HOFS
lda #-32
sta BG3VOFS
stz BG3VOFS
lda #$0f
sta INIDISP
lda #$81
sta NMITIMEN
; Loop forever.
Forever:
jmp Forever
InitSNES:
lda #$8F
sta INIDISP
stz OBSEL
stz OAMADDL
stz OAMADDH
stz BGMODE
stz MOSAIC
stz BG1SC
stz BG2SC
stz BG3SC
stz BG4SC
stz BG12NBA
stz BG34NBA
stz BG1VOFS
stz BG1VOFS
stz BG2VOFS
stz BG2VOFS
stz BG3VOFS
stz BG3VOFS
stz BG4VOFS
stz BG4VOFS
stz BG1HOFS
stz BG1HOFS
stz BG2HOFS
stz BG2HOFS
stz BG3HOFS
stz BG3HOFS
stz BG4HOFS
stz BG4HOFS
lda #$80
sta VMAIN
stz VMADDL
stz VMADDH
stz M7SEL
stz M7A
lda #$01
sta M7A
stz M7B
stz M7B
stz M7C
stz M7C
stz M7D
sta M7D
stz M7X
stz M7X
stz M7Y
stz M7Y
stz CGADD
stz W12SEL
stz W34SEL
stz WOBJSEL
stz WH0
stz WH1
stz WH2
stz WH3
stz WBGLOG
stz WOBJLOG
sta TM
stz TS
stz TMW
stz TSW
lda #$30
sta CGWSEL
stz CGADSUB
lda #$E0
sta COLDATA
stz SETINI
stz NMITIMEN
lda #$FF
sta WRIO
stz WRMPYA
stz WRMPYB
stz WRDIVL
stz WRDIVH
stz WRDIVB
stz HTIMEL
stz HTIMEH
stz VTIMEL
stz VTIMEH
stz MDMAEN
stz HDMAEN
stz MEMSEL
rts
; IRQ vectors
;
vbl_handler:
rti
irq_handler:
rti
zero:
db 0
|
