Add labels for hardware registers
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6CB106C25E86A9F7
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@ -1,5 +1,4 @@
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includeonce
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lorom
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org $00FFE0
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@ -23,3 +22,144 @@ dw $FFFF
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dw $FFFF
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dw Reset
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dw $FFFF
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;; Address synonyms for hardware registers
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; PPU registers
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INIDISP = $2100 ; Control screen brightness and F-blank
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OBJSEL = $2101 ; Object properties
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OAMADDL = $2102 ; OAM address (low byte)
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OAMADDH = $2103 ; ^ (high byte)
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OAMDATAW = $2104 ; OAM data write
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BGMODE = $2105 ; Background mode
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MOSAIC = $2106 ; Mosaic effect switch
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BG1SC = $2107 ; Background 1 tilemap
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BG2SC = $2108 ; Background 2 tilemap
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BG3SC = $2109 ; Background 3 tilemap
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BG4SC = $210A ; Background 4 tilemap
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BG12NBA = $210B ; Backgrounds 1 & 2 graphics
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BG34NBA = $210C ; Backgrounds 3 & 4 graphics
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BG1HOFS = $210D ; Background 1 horizontal scroll
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BG1VOFS = $210E ; ^ vertical scroll
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BG2HOFS = $210F ; Background 2 horizontal scroll
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BG2VOFS = $2110 ; ^ vertical scroll
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BG3HOFS = $2111 ; Background 3 horizontal scroll
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BG3VOFS = $2112 ; ^ vertical scroll
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BG4HOFS = $2113 ; Background 4 horizontal scroll
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BG4VOFS = $2114 ; ^ vertical scroll
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VMAINC = $2115 ; VRAM register settings
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VMADDL = $2116 ; VRAM address (low byte)
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VMADDH = $2117 ; ^ (high byte)
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VMDATALW = $2118 ; VRAM data write (low byte)
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VMDATAHW = $2119 ; ^ (high byte)
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M7SEL = $211A ; Mode 7 properties
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M7A = $211B ; Mode 7 matrix A-coordinate
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M7B = $211C ; ^ - B-coordinate
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M7C = $211D ; ^ - C-coordinate
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M7D = $211E ; ^ - D-coordinate
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M7X = $211F ; Mode 7 transform center X-coordinate
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M7Y = $2120 ; ^ Y-coordinate
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CGADD = $2121 ; CGRAM address
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CGDATAW = $2122 ; CGRAM data write
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W12SEL = $2123 ; Window enable switches for BG1&2
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W34SEL = $2124 ; ^ for BG3&4
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WOBJSEL = $2125 ; ^ for objects
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WH0 = $2126 ; Window 1 left bound
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WH1 = $2127 ; ^ right bound
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WH2 = $2128 ; Window 2 left bound
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WH3 = $2129 ; ^ right bound
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WBGLOG = $212A ; Window intersection logic (for bgs)
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WOBJLOG = $212B ; ^ (for objects)
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TM = $212C ; Display on main screen
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TS = $212D ; ^ on sub screen
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TMW = $212E ; Enable windowing on main screen
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TSW = $212F ; ^ on sub screen
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CGSWSEL = $2130 ; Apply window switch
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CGADSUB = $2131 ; Color math method
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COLDATA = $2132 ; Subscreen fixed color
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INISET = $2133 ; Misc. display settings
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MPYL = $2134 ; PPU multiplication result (low byte)
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MPYM = $2135 ; ^ (middle byte)
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MPYH = $2136 ; ^ (high byte)
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SLHV = $2137 ; Scan position CPU latch
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OAMDATAR = $2138 ; OAM data read
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VMDATALR = $2139 ; VRAM data read (low byte)
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VMDATAHR = $213A ; ^ (high byte)
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CGDATAR = $213B ; CGRAM data read
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OPHCT = $213C ; Horizontal scan position (must be latched)
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OPVCT = $213D ; Scanline (must be latched)
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STAT77 = $213E ; PPU flags, read only
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STAT78 = $213F ; ^
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APUIO0 = $2140 ; APU I/O port 1
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APUIO1 = $2141 ; ^ port 2
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APUIO2 = $2142 ; ^ port 3
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APUIO3 = $2143 ; ^ port 4
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; WRAM registers
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WMDATA = $2180 ; WRAM data access
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WMADDL = $2181 ; WRAM address (low byte)
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WMADDM = $2182 ; ^ (middle byte)
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WMADDH = $2183 ; ^ (high byte)
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; Joypad registers
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JOYPAD1 = $4016
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JOYPAD2 = $4017
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; CPU registers
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NMITIMEN = $4200 ; Switch for NMI (V-blank)
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WRIO = $4201 ; Write to I/O ports of joypads
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WRMPYA = $4202 ; Multiplication routine input
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WRMPYB = $4203 ; ^
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WRDIVL = $4204 ; Division routine input (low byte)
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WRDIVH = $4205 ; ^ (high byte)
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WRDIVB = $4206 ; Division routine input 2
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HTIMEL = $4207 ; Horizontal IRQ timer (low byte)
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HTIMEH = $4208 ; ^ (high byte)
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VTIMEL = $4209 ; Vertical IRQ timer (low byte)
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VTIMEH = $420A ; ^ (high byte)
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MDMAEN = $420B ; DMA enable flags
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HDMAEN = $420C ; HDMA enable flags
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MEMSEL = $420D ; FastROM switch
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RDNMI = $4210 ; NMI flag (should be read at V-blank)
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TIMEUP = $4211 ; IRQ flag (should be read at IRQ)
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HVBJOY = $4212 ; Blanking flags
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RDIO = $4213 ; Read from I/O ports of joypads
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RDDIVL = $4214 ; Division result (low byte)
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RDDIVH = $4215 ; ^ (high byte)
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RDMPYL = $4216 ; Multiplication result (low byte)
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RDMPYH = $4217 ; ^ (high byte)
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STDCNTRL1L = $4218 ; Auto-joypad-read 1 (low byte)
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STDCNTRL1H = $4219 ; ^ (high byte)
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STDCNTRL2L = $421A ; Auto-joypad-read 2 (low byte)
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STDCNTRL2H = $421B ; ^ (high byte)
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STDCNTRL3L = $421C ; Auto-joypad-read 3 (low byte)
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STDCNTRL3H = $421D ; ^ (high byte)
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STDCNTRL4L = $421E ; Auto-joypad-read 4 (low byte)
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STDCNTRL4H = $421F ; ^ (high byte)
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; DMA registers
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macro dma(c)
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DMA<c>PARAM = $43<c>0 ; DMA transfer parameters
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DMA<c>ADDB = $43<c>1 ; DMA B-bus address ($21XX)
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DMA<c>ADDAL = $43<c>2 ; DMA A-bus address (low byte)
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DMA<c>ADDAM = $43<c>3 ; ^ (middle byte)
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DMA<c>ADDAH = $43<c>4 ; ^ (high byte)
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DMA<c>AMTL = $43<c>5 ; Number of bytes to transfer (low byte)
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DMA<c>AMTH = $43<c>6 ; ^ (high byte)
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DMA<c>INDH = $43<c>7 ; Indirect HDMA transfer address
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DMA<c>ADDA2L = $43<c>8 ; Automatically generated
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DMA<c>ADDA2M = $43<c>9 ; ^
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DMA<c>LINES = $43<c>A ; ^
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endmacro
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; For each DMA channel
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%dma(0)
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%dma(1)
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%dma(2)
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%dma(3)
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%dma(4)
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%dma(5)
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%dma(6)
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%dma(7)
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@ -13,90 +13,95 @@ endmacro
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org $008000
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Init:
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;; Set defaults for registers
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sep #$30 ; X,Y,A are 8 bit numbers
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lda #$8F ; screen off, full brightness
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sta $2100 ; brightness + screen enable register
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stz $2101 ; Sprite register (size + address in VRAM)
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stz $2102 ; Sprite registers (address of sprite memory [OAM])
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stz $2103 ; "" ""
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stz $2105 ; Mode 0, = Graphic mode register
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stz $2106 ; noplanes, no mosaic, = Mosaic register
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stz $2107 ; Plane 0 map VRAM location
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stz $2108 ; Plane 1 map VRAM location
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stz $2109 ; Plane 2 map VRAM location
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stz $210A ; Plane 3 map VRAM location
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stz $210B ; Plane 0+1 Tile data location
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stz $210C ; Plane 2+3 Tile data location
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stz $210D ; Plane 0 scroll x (first 8 bits)
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stz $210D ; Plane 0 scroll x (last 3 bits) #$0 - #$07ff
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lda #$FF ; The top pixel drawn on the screen isn't the top one in the tilemap, it's the one above that.
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sta $210E ; Plane 0 scroll y (first 8 bits)
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sta $2110 ; Plane 1 scroll y (first 8 bits)
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sta $2112 ; Plane 2 scroll y (first 8 bits)
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sta $2114 ; Plane 3 scroll y (first 8 bits)
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lda #$07 ; Since this could get quite annoying, it's better to edit the scrolling registers to fix this.
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sta $210E ; Plane 0 scroll y (last 3 bits) #$0 - #$07ff
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sta $2110 ; Plane 1 scroll y (last 3 bits) #$0 - #$07ff
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sta $2112 ; Plane 2 scroll y (last 3 bits) #$0 - #$07ff
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sta $2114 ; Plane 3 scroll y (last 3 bits) #$0 - #$07ff
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stz $210F ; Plane 1 scroll x (first 8 bits)
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stz $210F ; Plane 1 scroll x (last 3 bits) #$0 - #$07ff
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stz $2111 ; Plane 2 scroll x (first 8 bits)
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stz $2111 ; Plane 2 scroll x (last 3 bits) #$0 - #$07ff
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stz $2113 ; Plane 3 scroll x (first 8 bits)
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stz $2113 ; Plane 3 scroll x (last 3 bits) #$0 - #$07ff
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lda #$80 ; increase VRAM address after writing to $2119
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sta $2115 ; VRAM address increment register
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stz $2116 ; VRAM address low
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stz $2117 ; VRAM address high
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stz $211A ; Initial Mode 7 setting register
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stz $211B ; Mode 7 matrix parameter A register (low)
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lda #$01
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sta $211B ; Mode 7 matrix parameter A register (high)
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stz $211C ; Mode 7 matrix parameter B register (low)
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stz $211C ; Mode 7 matrix parameter B register (high)
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stz $211D ; Mode 7 matrix parameter C register (low)
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stz $211D ; Mode 7 matrix parameter C register (high)
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stz $211E ; Mode 7 matrix parameter D register (low)
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sta $211E ; Mode 7 matrix parameter D register (high)
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stz $211F ; Mode 7 center position X register (low)
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stz $211F ; Mode 7 center position X register (high)
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stz $2120 ; Mode 7 center position Y register (low)
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stz $2120 ; Mode 7 center position Y register (high)
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stz $2121 ; Color number register ($0-ff)
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stz $2123 ; BG1 & BG2 Window mask setting register
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stz $2124 ; BG3 & BG4 Window mask setting register
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stz $2125 ; OBJ & Color Window mask setting register
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stz $2126 ; Window 1 left position register
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stz $2127 ; Window 2 left position register
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stz $2128 ; Window 3 left position register
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stz $2129 ; Window 4 left position register
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stz $212A ; BG1, BG2, BG3, BG4 Window Logic register
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stz $212B ; OBJ, Color Window Logic Register (or,and,xor,xnor)
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stz $212C ; Main Screen designation (planes, sprites enable)
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stz $212D ; Sub Screen designation
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stz $212E ; Window mask for Main Screen
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stz $212F ; Window mask for Sub Screen
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lda #$30
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sta $2130 ; Color addition & screen addition init setting
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stz $2131 ; Add/Sub sub designation for screen, sprite, color
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lda #$E0
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sta $2132 ; color data for addition/subtraction
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stz $2133 ; Screen setting (interlace x,y/enable SFX data)
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stz $4200 ; Enable V-blank, interrupt, Joypad register
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lda #$8F
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sta INIDISP ; screen off, full brightness
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stz OBJSEL ; Objects are 8x8 or 16x16,
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; use first 2 pages of VRAM
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stz OAMADDL ; OAM address $0000
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stz OAMADDH
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stz BGMODE ; Background mode 0
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stz MOSAIC
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stz BG1SC ; All backgrounds use tilemap $0000,
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stz BG2SC ; 1 page in size (32x32)
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stz BG3SC
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stz BG4SC
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stz BG12NBA ; All backgrounds use character data $0000
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stz BG34NBA
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lda #$FF
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sta $4201 ; Programmable I/O port
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stz $4202 ; Multiplicand A
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stz $4203 ; Multiplier B
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stz $4204 ; Multiplier C
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stz $4205 ; Multiplicand C
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stz $4206 ; Divisor B
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stz $4207 ; Horizontal Count Timer
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stz $4208 ; Horizontal Count Timer MSB (most significant bit)
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stz $4209 ; Vertical Count Timer
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stz $420A ; Vertical Count Timer MSB
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stz $420B ; General DMA enable (bits 0-7)
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stz $420C ; Horizontal DMA (HDMA) enable (bits 0-7)
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stz $420D ; Access cycle designation (slow/fast rom)
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cli ; Enable interrupts
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sta BG1VOFS ; Vertical scroll position $07FF
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sta BG2VOFS
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sta BG3VOFS
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sta BG4VOFS
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lda #$07
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sta BG1VOFS
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sta BG2VOFS
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sta BG3VOFS
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sta BG4VOFS
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stz BG1HOFS ; Horizontal scroll position $0000
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stz BG1HOFS
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stz BG2HOFS
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stz BG2HOFS
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stz BG3HOFS
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stz BG3HOFS
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stz BG4HOFS
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stz BG4HOFS
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lda #$80
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sta VMAINC ; Increment after high byte by 1, no remapping
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stz VMADDL ; VRAM address $0000
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stz VMADDH
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stz M7SEL
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lda #$01
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stz M7A ; Default to identity matrix
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sta M7A ; [$0001 $0000]
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stz M7B ; [$0000 $0001]
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stz M7B
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stz M7C
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stz M7C
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stz M7D
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sta M7D
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stz M7X
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stz M7X
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stz M7Y
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stz M7Y
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stz CGADD ; CGRAM address $00
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stz W12SEL ; Disable all layers
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stz W34SEL
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stz WOBJSEL
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stz WH0 ; Disable all windows
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stz WH1
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stz WH2
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stz WH3
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stz WBGLOG ; Intersection mode OR
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stz WOBJLOG
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stz TM ; Disable all layers on main screen
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stz TS ; Disable all layers on sub screen
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stz TMW
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stz TSW
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lda #$30
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sta CGSWSEL ; Enable main screen, disable sub screen
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stz CGADSUB ; Disable color math
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lda #$E0
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sta COLDATA ; Fixed subscreen color black
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stz INISET ; Disable interlacing, overscan,
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; pseudo-512 mode
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stz NMITIMEN ; Disable NMIs (V-blank), IRQ timers,
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; and auto-joypad-read
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lda #$FF
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sta WRIO ; Pull all I/O ports low
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stz WRMPYA
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stz WRMPYB
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stz WRDIVL
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stz WRDIVH
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stz WRDIVB
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stz HTIMEL
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stz HTIMEH
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stz VTIMEL
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stz VTIMEH
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stz MDMAEN ; Disable all DMA & HDMA
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stz HDMAEN
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stz MEMSEL ; SlowROM default
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cli
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rts
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