mirror of
https://github.com/safiire/n65.git
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520 lines
15 KiB
NASM
520 lines
15 KiB
NASM
;------------------------------------------------------------------------------
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; This is a direct port of Michael Martin's tutorial project for NES101
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; With some modifications to the tile map, and extra comments, and ported to
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; suit my assembler. - Saf
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; See:
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; http://hackipedia.org/Platform/Nintendo/NES/tutorial,%20NES%20programming%20101/NES101.html
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;
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;;;;
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; Create an iNES header
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.ines {"prog": 1, "char": 1, "mapper": 0, "mirror": 0}
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;;;;
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; Include all the symbols in the nes library
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.inc <nes.sym>
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;;;;
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; Open the prog section bank 0
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.segment prog 0
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;;;;
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; Here is a good spot to associate zero page memory addresses
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; to symbols that we can use throughout the program.
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.org $0000
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.space dx 1
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.space a_button 1
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.space scroll 1
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;;;;
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; We can use scope to declare a C like struct at $0200
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.org $0200
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.scope sprite
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.space y 1
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.space pattern 1
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.space color 1
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.space x 1
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.
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;;;;
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; Setup the interrupt vectors
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.org $FFFA
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.dw vblank
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.dw main
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.dw irq
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;;;;
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; Here is our code entry point, which we'll call main.
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.org $C000
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.scope main
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; Disable interrupts and decimal flag
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sei
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cld
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; Wait for 2 vblanks
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wait_vb1:
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lda nes.ppu.status
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bpl wait_vb1
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wait_vb2:
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lda nes.ppu.status
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bpl wait_vb2
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; Now we want to initialize the hardware to a known state
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lda #$00
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ldx #$00
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clear_segments:
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sta $00, x
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sta $0100, x
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sta $0200, x
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sta $0300, x
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sta $0400, x
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sta $0500, x
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sta $0600, x
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sta $0700, x
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inx
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bne clear_segments
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; Reset the stack pointer
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ldx #$FF
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txs
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; Disable all graphics and vblank nmi
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lda #$00
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sta nes.ppu.control1
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sta nes.ppu.control2
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jsr init_graphics
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jsr init_input
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jsr init_sound
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jsr init_ppu
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; Resume interrupts and loop here forever
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cli
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forever:
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jmp forever
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.
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;;;;
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; Set basic PPU registers. Load background from $0000,
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; sprites from $1000, and the name table from $2000.
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; These literals would make more sense in binary.
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.scope init_ppu
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lda #$88
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sta nes.ppu.control1
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lda #$1E
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sta nes.ppu.control2
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rts
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.
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;;;;
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; Initialize all the sprites, palettes, nametables, and scrolling
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.scope init_graphics
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jsr init_sprites
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jsr load_palette
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jsr load_name_tables
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jsr init_scrolling
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rts
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.
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;;;;
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; Initialize the controller input, keeping track of the A button
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.scope init_input
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lda #$00
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sta a_button zp
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rts
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.
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;;;;
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; Initialize the APU to known values
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.scope init_sound
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lda #$01
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sta nes.apu.channel_enable
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lda #$00
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sta nes.apu.pulse1.ramp_control
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rts
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.
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;;;;
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; Clear page #2, which we'll use to hold sprite data
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; This subroutine clearly shows why I need to have symbols
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; to refer to bits of RAM in the zero page like dx, etc.
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.scope init_sprites
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lda #$00
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ldx #$00
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sprite_clear1:
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sta sprite, x
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inx
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bne sprite_clear1
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; initialize Sprite 0
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lda #$70 ; Y Coordinate
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sta sprite.y ; Initialize the y value of sprite
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lda #$01
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sta sprite.pattern ; Pattern number 1
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sta sprite.x ; X value also 1, and leave color 0
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; Set initial value of dx
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lda #$01
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sta dx zp ; Initialize delta x value to 1
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rts
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.
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;;;;
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; Load palette into $3F00
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.scope load_palette
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lda #$3F
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ldx #$00
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sta nes.vram.address2
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stx nes.vram.address2
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loop:
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lda palette, x
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sta nes.vram.io
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inx
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cpx #$20
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bne loop
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rts
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.
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;;;;
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; Put the ASCII values from bg into the first name table, at $2400
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; The tile values are conveniently mapped to their ASCII values
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.scope load_name_tables
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ldy #$00
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ldx #$04
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lda #<bg
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sta $10
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lda #>bg
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sta $11
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lda #$24
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sta nes.vram.address2
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lda #$00
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sta nes.vram.address2
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loop:
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lda ($10), y
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sta nes.vram.io
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iny
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bne loop
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inc $11
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dex
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bne loop
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; This now clears the second name table?
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; I think this is because writing to $2007 auto increments the
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; written value
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ldy #$00
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ldx #$04
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lda #$00
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.scope
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loop:
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sta nes.vram.io
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iny
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bne loop
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dex
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bne loop
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.
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rts
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.
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;;;;
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; This initializes the scrolling value in the zero page
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; So that we begin offscreen and can scroll down
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.scope init_scrolling
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lda #$F0
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sta scroll zp
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rts
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.
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;;;;
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; Update the sprite, I don't exactly understand the DMA call yet.
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update_sprite:
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lda #>sprite
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sta nes.sprite.dma ; Jam page $200-$2FF into SPR-RAM, how do we get these numbers?
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lda sprite.x
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beq hit_left
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cmp #$F7
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bne edge_done ; Detect hitting either edge
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; Hit right
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ldx #$FF
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stx dx zp
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jsr high_c ; And play a high C note if we do
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jmp edge_done
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hit_left:
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ldx #$01
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stx dx zp
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jsr high_c
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edge_done: ; update X and store it.
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clc
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adc dx zp
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sta sprite.x
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rts
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;;;;
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; Read the first controller, and handle input
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react_to_input:
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lda #$01 ; strobe joypad
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sta nes.controller1
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lda #$00
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sta nes.controller1
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lda nes.controller1 ; Is the A button down?
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and #$01
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beq not_a
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ldx a_button zp
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bne a_done ; Only react if the A button wasn't down last time.
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sta a_button zp ; Store the 1 in local variable 'a' so that we this is
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jsr reverse_dx ; only called once per press.
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jmp a_done
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not_a:
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sta a_button zp ; A has been released, so put that zero into 'a'.
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a_done:
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lda nes.controller1 ; B does nothing
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lda nes.controller1 ; Select does nothing
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lda nes.controller1 ; Start does nothing
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lda nes.controller1 ; Up
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and #$01
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beq not_up
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ldx sprite.y ; Load Y value
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cpx #$07
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beq not_up ; No going past the top of the screen
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dex
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stx sprite.y
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not_up:
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lda nes.controller1 ; Down
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and #$01
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beq not_dn
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ldx sprite.y
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cpx #$DF ; No going past the bottom of the screen.
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beq not_dn
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inx
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stx sprite.y
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not_dn:
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rts ; Ignore left and right
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;;;;
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; XORing with $ff toggles between 0x1 and 0xfe (-1)
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reverse_dx:
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lda #$FF
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eor dx zp
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clc
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adc #$01 ; Add dx, and store to variable
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sta dx zp
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jsr low_c ; Play the reverse low C note
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rts
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;;;;
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; Scroll the screen if we have to
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scroll_screen:
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ldx #$00 ; Reset VRAM Address to $0000
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stx nes.vram.address2
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stx nes.vram.address2
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ldx scroll zp ; Do we need to scroll at all?
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beq no_scroll
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dex
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stx scroll zp
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lda #$00
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sta nes.vram.address1 ; Write 0 for Horiz. Scroll value
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stx nes.vram.address1 ; Write the value of 'scroll' for Vert. Scroll value
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no_scroll:
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rts
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;;;;
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; Play a low C note on square 1
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low_c:
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pha
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lda #$84
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sta nes.apu.pulse1.control
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lda #$AA
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sta nes.apu.pulse1.ft
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lda #$09
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sta nes.apu.pulse1.ct
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pla
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rts
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;;;;
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; Play a high C note on square 1
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high_c:
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pha
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lda #$86
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sta nes.apu.pulse1.control
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lda #$69
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sta nes.apu.pulse1.ft
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lda #$08
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sta nes.apu.pulse1.ct
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pla
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rts
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;;;;
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; Update everything on every vblank
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vblank:
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jsr scroll_screen
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jsr update_sprite
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jsr react_to_input
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rti
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;;;;
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; Don't do anything on IRQ
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irq:
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rti
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;;;;
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; Palette data stored in the PROG section, to be copied later
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palette:
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.bytes $0E,$00,$0E,$19,$00,$00,$00,$00,$00,$00,$00,$00,$01,$00,$01,$21
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.bytes $0E,$20,$22,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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;;;;
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; Background data stored in the PROG section to be copied later
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bg:
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.ascii " "
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.ascii " "
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.ascii " SAF'S 6502 NES ASSEMBLER "
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.ascii " "
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.ascii " "
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.ascii " "
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.ascii " VSS RES "
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.ascii " RDY PHI2 "
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.ascii " PH1 S0 "
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.ascii " IRQ 6 PHI0 "
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.ascii " NC NC "
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.ascii " NMI NC "
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.ascii " SYNC 5 R/W "
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.ascii " VCC D0 "
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.ascii " A0 D1 "
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.ascii " A1 0 D2 "
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.ascii " A2 D3 "
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.ascii " A3 D4 "
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.ascii " A4 2 D5 "
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.ascii " A5 D6 "
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.ascii " A6 D7 "
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.ascii " A7 A15 "
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.ascii " A8 A14 "
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.ascii " A9 A13 "
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.ascii " A10 A12 "
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.ascii " A11 VSS "
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.ascii " "
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.ascii " "
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.ascii " "
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.ascii " "
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;;;;
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; Attribute table, this is basically the tilemap
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.bytes $00,$00,$00,$00,$00,$00,$00,$00,
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.bytes $00,$00,$FF,$FF,$FF,$00,$00,$00,
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.bytes $00,$00,$FF,$FF,$FF,$00,$00,$00,
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.bytes $00,$00,$FF,$FF,$FF,$00,$00,$00,
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.bytes $00,$00,$FF,$FF,$FF,$00,$00,$00,
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.bytes $00,$00,$FF,$FF,$FF,$00,$00,$00,
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.bytes $00,$00,$FF,$FF,$FF,$00,$00,$00,
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.bytes $00,$00,$00,$00,$00,$00,$00,$00,
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;;;;
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; This is CHR-ROM bank 0, which starts at 0x0000, but I'm skipping the first $0200 because
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; the first bunch of ASCII characters are not represented. This is the commodore 64's
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; character ROM.
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.segment char 0
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.org $0200
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.bytes $00,$00,$00,$00,$00,$00,$00,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 32
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.bytes $18,$18,$18,$18,$00,$00,$18,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 33
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.bytes $66,$66,$66,$00,$00,$00,$00,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 34
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.bytes $66,$66,$FF,$66,$FF,$66,$66,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 35
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.bytes $18,$3E,$60,$3C,$06,$7C,$18,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 36
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.bytes $62,$66,$0C,$18,$30,$66,$46,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 37
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.bytes $3C,$66,$3C,$38,$67,$66,$3F,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 38
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.bytes $06,$0C,$18,$00,$00,$00,$00,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 39
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.bytes $0C,$18,$30,$30,$30,$18,$0C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 40
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.bytes $30,$18,$0C,$0C,$0C,$18,$30,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 41
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.bytes $00,$66,$3C,$FF,$3C,$66,$00,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 42
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.bytes $00,$18,$18,$7E,$18,$18,$00,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 43
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.bytes $00,$00,$00,$00,$00,$18,$18,$30,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 44
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.bytes $00,$00,$00,$7E,$00,$00,$00,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 45
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.bytes $00,$00,$00,$00,$00,$18,$18,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 46
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.bytes $00,$03,$06,$0C,$18,$30,$60,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 47
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.bytes $3C,$66,$6E,$76,$66,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 48
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.bytes $18,$18,$38,$18,$18,$18,$7E,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 49
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.bytes $3C,$66,$06,$0C,$30,$60,$7E,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 50
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.bytes $3C,$66,$06,$1C,$06,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 51
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.bytes $06,$0E,$1E,$66,$7F,$06,$06,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 52
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.bytes $7E,$60,$7C,$06,$06,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 53
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.bytes $3C,$66,$60,$7C,$66,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 54
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.bytes $7E,$66,$0C,$18,$18,$18,$18,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 55
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.bytes $3C,$66,$66,$3C,$66,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 56
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.bytes $3C,$66,$66,$3E,$06,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 57
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.bytes $00,$00,$18,$00,$00,$18,$00,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 58
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.bytes $00,$00,$18,$00,$00,$18,$18,$30,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 59
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.bytes $0E,$18,$30,$60,$30,$18,$0E,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 60
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.bytes $00,$00,$7E,$00,$7E,$00,$00,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 61
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.bytes $70,$18,$0C,$06,$0C,$18,$70,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 62
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.bytes $3C,$66,$06,$0C,$18,$00,$18,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 63
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.bytes $3C,$66,$6E,$6E,$60,$62,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 64
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.bytes $18,$3C,$66,$7E,$66,$66,$66,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 65
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.bytes $7C,$66,$66,$7C,$66,$66,$7C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 66
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.bytes $3C,$66,$60,$60,$60,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 67
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.bytes $78,$6C,$66,$66,$66,$6C,$78,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 68
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.bytes $7E,$60,$60,$78,$60,$60,$7E,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 69
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.bytes $7E,$60,$60,$78,$60,$60,$60,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 70
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.bytes $3C,$66,$60,$6E,$66,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 71
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.bytes $66,$66,$66,$7E,$66,$66,$66,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 72
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.bytes $3C,$18,$18,$18,$18,$18,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 73
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.bytes $1E,$0C,$0C,$0C,$0C,$6C,$38,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 74
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.bytes $66,$6C,$78,$70,$78,$6C,$66,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 75
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.bytes $60,$60,$60,$60,$60,$60,$7E,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 76
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.bytes $63,$77,$7F,$6B,$63,$63,$63,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 77
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.bytes $66,$76,$7E,$7E,$6E,$66,$66,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 78
|
|
.bytes $3C,$66,$66,$66,$66,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 79
|
|
.bytes $7C,$66,$66,$7C,$60,$60,$60,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 80
|
|
.bytes $3C,$66,$66,$66,$66,$3C,$0E,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 81
|
|
.bytes $7C,$66,$66,$7C,$78,$6C,$66,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 82
|
|
.bytes $3C,$66,$60,$3C,$06,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 83
|
|
.bytes $7E,$18,$18,$18,$18,$18,$18,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 84
|
|
.bytes $66,$66,$66,$66,$66,$66,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 85
|
|
.bytes $66,$66,$66,$66,$66,$3C,$18,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 86
|
|
.bytes $63,$63,$63,$6B,$7F,$77,$63,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 87
|
|
.bytes $66,$66,$3C,$18,$3C,$66,$66,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 88
|
|
.bytes $66,$66,$66,$3C,$18,$18,$18,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 89
|
|
.bytes $7E,$06,$0C,$18,$30,$60,$7E,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 90
|
|
.bytes $3C,$30,$30,$30,$30,$30,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 91
|
|
.bytes $0C,$12,$30,$7C,$30,$62,$FC,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 92
|
|
.bytes $3C,$0C,$0C,$0C,$0C,$0C,$3C,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 93
|
|
.bytes $00,$18,$3C,$7E,$18,$18,$18,$18,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 94
|
|
.bytes $00,$10,$30,$7F,$7F,$30,$10,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF ; Character 95
|
|
|
|
|
|
;;;;
|
|
; Here is sprite data on CHAR ROM page 2
|
|
.org $1000
|
|
|
|
.bytes $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00 ; Character 0: Blank
|
|
.bytes $18,$24,$66,$99,$99,$66,$24,$18,$00,$18,$18,$66,$66,$18,$18,$00 ; Character 1: Diamond sprite
|
|
|