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NES Hello World code
Includes iNES and UNIF linkage.
This commit is contained in:
Michael Martin
parent
a9f406489d
commit
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20
platform/nes/demo/hello_chr.oph
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20
platform/nes/demo/hello_chr.oph
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;; NES "Hello World" character tables
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;; We spell out "Hello World" and we make sure that the colors are
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;; different so our palette shift works.
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.text
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.org $0000
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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.byte $c6,$c6,$c6,$fe,$c6,$c6,$c6,$00,$00,$00,$00,$00,$00,$00,$00,$00 ; H (color 1) #1
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$fe,$c0,$c0,$fc,$c0,$c0,$fe,$00 ; E (color 2) #2
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.byte $60,$60,$60,$60,$60,$60,$7e,$00,$60,$60,$60,$60,$60,$60,$7e,$00 ; L (color 3) #3
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.byte $60,$60,$60,$60,$60,$60,$7e,$00,$00,$00,$00,$00,$00,$00,$00,$00 ; L (color 1) #4
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$7c,$c6,$c6,$c6,$c6,$c6,$7c,$00 ; O (color 2) #5
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.byte $c6,$c6,$d6,$fe,$fe,$ee,$c6,$00,$c6,$c6,$d6,$fe,$fe,$ee,$c6,$00 ; W (color 3) #6
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.byte $7c,$c6,$c6,$c6,$c6,$c6,$7c,$00,$00,$00,$00,$00,$00,$00,$00,$00 ; O (color 1) #7
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$fc,$c6,$c6,$fc,$d8,$cc,$c6,$00 ; R (color 2) #8
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; L (color 3) #3
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.byte $f8,$cc,$c6,$c6,$c6,$cc,$f8,$00,$00,$00,$00,$00,$00,$00,$00,$00 ; D (color 1) #9
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.advance $2000 ; Fill in the rest of the CHR-ROM chip.
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5
platform/nes/demo/hello_ines.oph
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5
platform/nes/demo/hello_ines.oph
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; iNES header
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.byte $4e,$45,$53,$1a,$01,$01,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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.include "hello_prg.oph"
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.include "hello_chr.oph"
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162
platform/nes/demo/hello_prg.oph
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platform/nes/demo/hello_prg.oph
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;; PRG-ROM for our NES demo program.
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.alias sprites $200 ; Keep our OAM DMA here.
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.data
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.org $0000
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.space count 1
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.space palette 32
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.text
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.org $C000
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reset: sei
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cld
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; Wait two VBLANKs.
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* lda $2002
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bpl -
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* lda $2002
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bpl -
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; Disable all graphics.
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lda #$00
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sta $2000
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sta $2001
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; Mask out sound IRQs.
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lda #$40
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sta $4017
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; Clear out RAM.
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lda #$00
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ldx #$00
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* sta $000,x
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sta $100,x
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sta $200,x
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sta $300,x
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sta $400,x
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sta $500,x
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sta $600,x
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sta $700,x
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inx
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bne -
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; Reset the stack pointer.
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ldx #$FF
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txs
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; Clear the name tables.
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lda #$24
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sta $2006
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ldy #$00
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sty $2006
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ldx #$08
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lda #0
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ldy #0
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* sta $2007
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iny
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bne -
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dex
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bne -
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; Load the palette from later on in the ROM.
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lda #$3F
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ldx #$00
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sta $2006
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stx $2006
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* lda palette'rom,x
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sta palette,x
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sta $2007
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inx
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cpx #$20
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bne -
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; Load the proper sprite data into place.
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ldx #$00
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* lda graphics,x
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sta sprites,x
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inx
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bne -
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lda #$1E
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sta count ; Update twice a second
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; Un-scroll everything, just to be safe.
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lda #$00
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sta $2006
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sta $2006
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sta $2005
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sta $2005
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; Re-enable the displays.
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lda #$80
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sta $2000
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lda #$1E
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sta $2001
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; FINALLY. We've set up the system. From here on it's all up to
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; the NMI interrupt to handle things.
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cli
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* jmp -
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vblank: ; Refresh the SPR-RAM.
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lda #$02
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sta $4014
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; Time to update the palette?
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dec count
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bne irq ; If not, done.
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lda #$1E
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sta count ; Update twice a second
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; Update those parts of the palette that aren't transparent.
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ldx #$11
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* txa
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and #$03
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beq + ; Don't update transparents
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jsr bump'palette
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* inx
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cpx #$20
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bne --
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; Now re-blast that palette to VRAM.
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lda #$3F
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ldx #$00
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sta $2006
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stx $2006
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* lda palette,x
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sta $2007
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inx
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cpx #$20
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bne -
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; And reset the name tables.
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lda #$00
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sta $2006
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sta $2006
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sta $2005
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sta $2005
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irq: rti
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bump'palette:
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inc palette,x
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lda palette,x
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and #$0F
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sec
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sbc #$0D
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bpl bump'palette
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rts
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palette'rom:
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.byte $0d,$0d,$0d,$0d,$0d,$0d,$0d,$0d,$0d,$0d,$0d,$0d,$0d,$0d,$0d,$0d
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.byte $0d,$01,$02,$03,$0d,$04,$05,$06,$0d,$07,$08,$09,$0d,$0a,$0b,$0c
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graphics:
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.byte $70,$01,$00,$6c,$70,$02,$00,$74,$70,$03,$00,$7c,$70,$04,$01,$84
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.byte $70,$05,$01,$8c
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.byte $78,$06,$01,$6c,$78,$07,$02,$74,$78,$08,$02,$7c,$78,$03,$02,$84
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.byte $78,$09,$03,$8c
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.advance $FFFA
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.word vblank, reset, irq
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24
platform/nes/demo/hello_unif.oph
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24
platform/nes/demo/hello_unif.oph
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@ -0,0 +1,24 @@
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.byte "UNIF"
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.dword 7
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.advance $20
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.byte "MAPR"
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.dword ++-+
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*
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.byte "NES-NROM-256",0
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*
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.byte "NAME"
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.dword ++-+
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*
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.byte "Ophis Hello World Demo",0
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*
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.byte "PRG0"
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.dword $4000
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.include "hello_prg.oph"
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.byte "MIRR"
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.dword 1
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.byte 0
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.byte "CHR0"
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.dword $2000
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.include "hello_chr.oph"
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