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registers.asm
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registers.asm
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;===================================================================================================
; KEY
;===================================================================================================
; w - writeable
; r - readable
; 1 - single write
; 2 - double write
; for double write registers, the first write (low byte) is listed first
; f - accessible during fblank
; v - accessible during vblank
; h - accessible during hblank
; a - accessible anytime
; . - unused bit (open bus)
;===================================================================================================
;===================================================================================================
; PPU REGISTERS
;===================================================================================================
;===================================================================================================
; SCREEN SETTINGS
; $2100 w1 fvha
; f... bbbb
; f - force blank (0: disabled | 1: enabled)
; b - screen brightness 0–F
INIDISP = $002100
; OAM CHARACTER ADDRESSES AND OBJECT SIZE
; $2101 w1 fv
; sssnnbbb
; s - object sizes
; sss small large
; 000 8x8 16x16
; 001 8x8 32x32
; 010 8x8 64x64
; 011 16x16 32x32
; 100 16x16 64x64
; 101 32x32 64x64
; 110 16x32 32x64
; 111 16x32 32x32
;
; n - space between object namespaces, $1000 word steps
; b - obj tile address - $2000 word steps
OBSEL = $002101
; OAM ADDRESS ACCESS
; $2102 w1 fv
; $2103 w1 fv
; OAMADDH OAMADDL
; p......a aaaaaaaa
; a - OAM address
; p - object priority cycle (0: OBJ0 highest priority | 1: priority cycles)
OAMADDR = $002102
OAMADDL = $002102
OAMADDH = $002103
; OAM DATA WRITE
; $2104 w1 fv
; xxxxxxxx
; x - OAM data
OAMDATA = $002104
; BACKGROUND MODE AND CHARACTER SIZE
; $2105 w1 fvh
; dcba pmmm
; a - tile size for BG1 (0: 8x8 | 1: 16x16)
; b - tile size for BG2 (0: 8x8 | 1: 16x16)
; c - tile size for BG3 (0: 8x8 | 1: 16x16)
; d - tile size for BG4 (0: 8x8 | 1: 16x16)
; p - BG3 priority in mode 1 (0: normal | 1: highest)
; m - BG mode (0–7)
; BG1 BG2 BG3 BG4 Features
; 00 - 2bpp 2bpp 2bpp 2bpp None
; 01 - 4bpp 4bpp 2bpp ---- None
; 02 - 4bpp 4bpp offs ---- Offset per tile
; 03 - 8bpp 4bpp ---- ---- None
; 04 - 8bpp 2bpp offs ---- Offset per tile
; 05 - 4bpp 2bpp ---- ---- Hires
; 06 - 4bpp ---- offs ---- Hires / Offset per tile
; 07 - 8bpp EXT ---- ---- Affine transformation
BGMODE = $002105
; MOSAIC SIZE AND DESIGNATION
; $2106 w1 fvh
; ssss dcba
; a - mosaic to BG1 (0: disabled | 1: enabled)
; b - mosaic to BG2 (0: disabled | 1: enabled)
; c - mosaic to BG3 (0: disabled | 1: enabled)
; d - mosaic to BG4 (0: disabled | 1: enabled)
; s - pixelation size
MOSAIC = $002106
; BACKGROUND TILEMAP ADDRESS AND TILEMAP SIZE
; $2107 w1 fv
; $2108 w1 fv
; $2109 w1 fv
; $210A w1 fv
; aaaa aavh
; a - tilemap address in $400 word steps
; v - tilemap height (0: 32 tiles | 1: 64 tiles)
; h - tilemap width (0: 32 tiles | 1: 64 tiles)
BG1SC = $002107
BG2SC = $002108
BG3SC = $002109
BG4SC = $00210A
; BACKGROUND CHARACTER ADDRESS
; $210B w1 fv
; $210C w1 fv
; BG12NBA BG34NBA
; bbbbaaaa ddddcccc
; a - base address for BG1 tiles in $1000 word steps
; b - base address for BG2 tiles in $1000 word steps
; c - base address for BG3 tiles in $1000 word steps
; d - base address for BG4 tiles in $1000 word steps
; Just look at the nibbles
; 0 0000 $0000
; 1 0001 $2000
; 2 0010 $4000
; etc...
BG12NBA = $00210B
BG34NBA = $00210C
; BACKGROUND HORIZONTAL AND VERTICAL SCROLL
; $210D w2 fvh
; $210E w2 fvh
; $210F w2 fvh
; $2110 w2 fvh
; $2111 w2 fvh
; $2112 w2 fvh
; $2113 w2 fvh
; $2114 w2 fvh
;
; modes 0–6: oooooooo ......oo
; o - bg offset
;
; mode 7: mmmmmmmm ...mmmmm
; m - mode 7 bg offset
BG1HOFS = $00210D
BG1VOFS = $00210E
BG2HOFS = $00210F
BG2VOFS = $002110
BG3HOFS = $002111
BG3VOFS = $002112
BG4HOFS = $002113
BG4VOFS = $002114
M7HOFS = $00210D
M7VOFS = $00210E
; VRAM ADDRESS INCREMENT AND REMAPPING
; $2115 w1 fv
; a... mmii
; a - increment $2116[2] after (0: $2118 | 1 : $2119)
; m - remap addressing
; 00 = aaaaaaaabbbccccc => aaaaaaaabbbccccc (no remapping)
; 01 = aaaaaaaabbbccccc => aaaaaaaacccccbbb
; 10 = aaaaaaabbbcccccc => aaaaaaaccccccbbb
; 11 = aaaaaabbbccccccc => aaaaaacccccccbbb
;
; i - address increment
; 00 - increment by 1
; 01 - increment by 32
; 10 - increment by 128
; 11 - increment by 128
VMAIN = $002115
; VRAM ADDRESS ACCESS
; $2116 w1 fv
; $2117 w1 fv
; VMADDL VMADDH
; aaaaaaaa aaaaaaaa
; a - VRAM address
VMADDR = $002116
VMADDL = $002116
VMADDH = $002117
; VRAM WRITE DATA
; $2118 w1 fv
; $2119 w1 fv
; VMDATAL VMDATAH
; xxxxxxxx xxxxxxxx
; x - VRAM data
VMDATA = $002118
VMDATAL = $002118
VMDATAH = $002119
; MODE 7 SETTINGS
; $211A w1 fv
; we.. ..vh
; w - tilemap wrapping (0: wrap | 1: no wrap)
; e - empty space filler w/ no wrap (0: transparent | 1: tile 0)
; v - mirror tilemap vertically
; h - mirror tilemap horizontally
M7SEL = $00211A
; MODE 7 TRANSFORMATION PARAMETERS
; $211B w2 fvh
; $211C w2 fvh
; $211D w2 fvh
; $211E w2 fvh
; aaaaaaaa aaaaaaaa
; a - mode 7 parameter value
M7A = $00211B
M7B = $00211C
M7C = $00211D
M7D = $00211E
; #PPUMATH
; SIGNED MULTIPLICATION ARGUMENTS
; $211B w2 fvha
; $211C w1 fvha
; Can also be used for signed multiplication in mode 0–6
; apparently 0 delay with these
;
; PPUMULT16: llllllll hhhhhhhh
; l - low byte of 16-bit multiplicand
; h - high byte of 16-bit multiplicand
;
; PPUMULT8: mmmmmmmm
; m - 8-bit multiplicand
PPUMULT16 = $00211B
PPUMULT8 = $00211C
; MODE 7 CENTER OF TRANSFORMATION COORDINATES
; $211F w2 fvh
; $2120 w2 fvh
; oooooooo ...ooooo
; o - mode 7 axis center
M7X = $00211F
M7Y = $002120
; CGRAM ADDRESS ACCESS
; $2121 w1 fvh
; aaaaaaaa
; a - CGRAM address indexing words
CGADD = $002121
; CGRAM WRITE DATA
; $2122 w2 fvh
; gggrrrrr .bbbbbgg
; r - red component of color
; g - green component of color
; b - blue component of color
CGDATA = $002122
; WINDOW MASK SETTINGS
; $2123 w1 fvh
; $2124 w1 fvh
; $2125 w1 fvh
; W12SEL W34SEL SOBJSEL
; dmckbjai dmckbjai dmckbjai
; i - invert window 1 on BG1/BG3/OBJ (0: normal logic | 1: invert logic)
; a - enable window 1 on BG1/BG3/OBJ (0: disabled | 1: enabled)
;
; j - invert window 2 on BG1/BG3/OBJ (0: normal logic | 1: invert logic)
; b - enable window 2 on BG1/BG3/OBJ (0: disabled | 1: enabled)
;
; k - invert window 1 on BG2/BG4/COL (0: normal logic | 1: invert logic)
; c - enable window 1 on BG2/BG4/COL (0: disabled | 1: enabled)
;
; m - invert window 2 on BG2/BG4/COL (0: normal logic | 1: invert logic)
; d - enable window 2 on BG2/BG4/COL (0: disabled | 1: enabled)
W12SEL = $002123
W34SEL = $002124
WOBJSEL = $002125
; WINDOW POSITION DESIGNATION
; $2126 w1 fvh
; $2127 w1 fvh
; $2128 w1 fvh
; $2129 w1 fvh
;
; WH0 WH1
; llllllll rrrrrrrr
; l - window 1 left edge
; r - window 1 right edge
;
; WH2 WH3
; wwwwwwww eeeeeeee
; w - window 2 left edge
; e - window 2 right edge
WH0 = $002126
WH1 = $002127
WH2 = $002128
WH3 = $002129
WINDOW1L = $002126
WINDOW1R = $002127
WINDOW2L = $002128
WINDOW2R = $002129
; WINDOW MASK LOGIC
; $212A w1 fvh
; $212B w1 fvh
; WBGLOG WOBJLOG
; ddccbbaa ....ccoo
; a - window mask logic for BG1
; b - window mask logic for BG2
; c - window mask logic for BG3
; d - window mask logic for BG4
; o - window mask logic for OBJ
; c - window mask logic for COL
;
; all window masks share the same logic
; 00 - W1 OR W2
; 01 - W1 AND W2
; 10 - W1 XOR W2
; 11 - W1 XNOR W2
WBGLOG = $00212A
WOBJLOG = $00212B
; MAIN AND SUB SCREEN DESIGNATION
; $212C w1 fvh
; $212D w1 fvh
; ...odcba
; a - BG1 (0: disabled | 1: enabled on main/subscreen)
; b - BG2 (0: disabled | 1: enabled on main/subscreen)
; c - BG3 (0: disabled | 1: enabled on main/subscreen)
; d - BG4 (0: disabled | 1: enabled on main/subscreen)
; o - OBJ (0: disabled | 1: enabled on main/subscreen)
TM = $00212C
TS = $00212D
; MAIN AND SUB SCREEN WINDOW MASK DESIGNATION
; $212E w1 fvh
; $212F w1 fvh
; ...odcba
; a - window mask for BG1 (0: disabled | 1: enabled)
; b - window mask for BG2 (0: disabled | 1: enabled)
; c - window mask for BG3 (0: disabled | 1: enabled)
; d - window mask for BG4 (0: disabled | 1: enabled)
; o - window mask for OBJ (0: disabled | 1: enabled)
TMW = $00212E
TSW = $00212F
; COLOR MATH SETTINGS
; $2130 w1 fvh
; bbmm ..sd
; b - clip to black (same logic as m)
; m - prevent color math
; 00 - never
; 01 - outside COL window
; 10 - inside COL window
; 11 - always
;
; s - color source (0: fixed color | 1: subscreen)
; d - direct color mode (0: enabled | 1: disabled)
CGWSEL = $002130
; COLOR MATH DESIGNATION AND OPERATION
; $2131 w1 fvh
; shzo dcba
; s - color operation (0: addition | 1: subtraction)
; h - half color math (0: nothing | 1: final result divided by 2)
; z - color math on CGRAM0 (0: disabled | 1: enabled)
; a - color math on BG1 (0: disabled | 1: enabled)
; b - color math on BG2 (0: disabled | 1: enabled)
; c - color math on BG3 (0: disabled | 1: enabled)
; d - color math on BG4 (0: disabled | 1: enabled)
; o - color math on OBJ (0: disabled | 1: enabled)
CGADSUB = $002131
; COLOR MATH FIXED COLOR DATA
; $2132 w1 fvh
; bgrccccc
; r - red component of fixed color (0: unchanged | 1: change w/ write)
; g - green component of fixed color (0: unchanged | 1: change w/ write)
; b - blue component of fixed color (0: unchanged | 1: change w/ write)
; c - fixed color component value
COLDATA = $002132
; SCREEN INTERLACE AND SYNC SETTINGS
; $2133 w1 fvh
; se.. pvoi
; s - external sync (0: normal | 1: super impose)
; e - mode 7 EXTBG (0: disabled | 1: enabled)
; p - pseudo h512 (0: disabled | 1: enabled - shifts subscreen half dot left)
; v - enable overscan (0: 224 scanlines | 1: 239 scanlines)
; o - object interlace (0: disabled | 1: enabled)
; i - screen interlace (0: disabled | 1: enabled - interlace to source)
SETINI = $002133
; MULTIPLICATION RESULT
; $2134 r1 fvh
; $2135 r1 fvh
; $2136 r1 fvh
; MPYL MPYM MPYH
; llllllll mmmmmmmm hhhhhhhh
; l - low byte of product
; m - middle byte of product
; h - high byte of product
; see #PPUMATH
MPYL = $002134
MPYM = $002135
MPYH = $002136
; SOFTWARE LATCH FOR h/V COUNTER
; $2137 r1 fvha
; ........
; Contains no data; just a latch to update OPHCT and OPVCT
SLVH = $002137
; OAM READ DATA
; $2138 r1 fv
; xxxxxxxx
; x - OAM data read
OAMDATAREAD = $002138
; VRAM READ DATA
; $2139 r1 fv
; $213A r1 fv
; VMDATALR VMDATAHR
; llllllll hhhhhhhh
; l - low byte of VRAM data read
; h - high byte of VRAM data read
VMDATALREAD = $002139
VMDATAHREAD = $00213A
; CHRAM READ DATA
; $213B r2 fv
; gggrrrrr .bbbbbgg
; r - red component of color
; g - green component of color
; b - blue component of color
CGDATAREAD = $00213B
; HORIZONTAL COUNTER FROM LAST LATCH
; $213C r2 fvha
; hhhhhhhh .......h
; h - horizontal dot position
; 0 to 339
OPHCT = $00213C
; VERTICAL COUNTER FROM LAST LATCH
; $213D r2 fvha
; vvvvvvvv .......v
; v - vertical scanline position
; 0 to 261
OPVCT = $00213D
; PPU STATUS AND PPU1 VERSION NUMBER
; $213E r1 fvha
; trm. vvvv
; t - OBJ time overflow (0: fine | 1: too many pixels on scanline - 8*34=292)
; r - OBJ range overflow (0: fine | 1: too many objects on scanline - 32)
; m - mode (0: master | 1: slave)
; v - PPU1 5C77 version
STAT77 = $00213E
; PPU STATUS AND PPU2 VERSION NUMBER
; $213F r1 fvha
; il.p vvvv
; i - current interlace field (0: odd | 1: even)
; l - external latch (0: no data | 1: new data)
; p - region (0: NTSC 60hz | 1: PAL 50hz)
; v - PPU2 5C78 version
STAT78 = $00213F
; AUDIO PROCESSING UNIT COMMUNICATION PORTS
; $2140 rw1 fvha
; $2141 rw1 fvha
; $2142 rw1 fvha
; $2143 rw1 fvha
; aaaaaaaa
; a - APU data
APUIO = $002140
APUIO0 = $002140
APUIO1 = $002141
APUIO2 = $002142
APUIO3 = $002143
; APUIO is mirrored up to $217F
; WRAM DATA READ/WRITE
; $2180 rw1 fvha
; xxxxxxxx
; x - WRAM data
WMDATA = $002180
; WRAM ADDRESS ACCESS
; $2181 rw1 fvha
; $2182 rw1 fvha
; $2183 rw1 fvha
; WMADDL WMADDH WMADDB
; llllllll hhhhhhhh .......b
; l - low byte of WRAM address
; h - high byte of WRAM address
; b - bank of WRAM address (0: bank7E | 1: bank7F)
WMADDR = $002181
WMADDL = $002181
WMADDH = $002182
WMADDB = $002183
;===================================================================================================
;===================================================================================================
; CPU REGISTERS
;===================================================================================================
;===================================================================================================
; JOYPAD STROBE AND COMMUNICATION PORT
; $4016 rw1 fvha
; write: .......s
; s - strobe joypads
;
; read: ......ca
; a - port 1 data 1
; c - port 1 data 2
JOYPAD = $004016
JOYPADA = $004016
; $4017 r1 fvha
; ......db
; d - port 2 data 1
; b - port 2 data 2
JOYPADB = $004017
;---------------------------------------------------------------------------------------------------
; INTERRUPT AND AUTO JOYPAD READ ENABLE
; $4200 w1 fvha
; n.vh ...j
; n - NMI enable (0: disabled | 1: enabled)
; vh - IRQ trigger time
; 00 - No IRQ
; 0h - IRQ triggers when HTIME is hit
; v0 - IRQ triggers when VTIME is hit
; vh - IRQ triggers when both HTIME and VTIME are hit
; j - auto joypad read (0: disabled | 1: enabled)
NMITIMEN = $004200
; PROGRAMMABLE I/O PORT (WRITE)
; $4201 w1 fvha
; ab.. ....
; a - controller port 2 pin 6 (0: no ppu latching | 1: ppu can be latched)
; b - controller port 1 pin 6
WRIO = $004201
; MULTIPLIER AND MULTIPLICAND
; $4202 w1 fvha
; $4203 w1 fvha
; WRMPYA WRMPYB
; aaaaaaaa bbbbbbbb
; a - unsigned 8-bit multiplicand A
; b - unsigned 8-bit multiplicand B
; need to wait 8 cycles before reading
; cycles taken to read the initial opcode count
WRMPYA = $004202
WRMPYB = $004203
; DIVISOR AND DIVIDEND
; $4204 w1 fvha
; $4205 w1 fvha
; $4206 w1 fvha
; WRDIVL WRDIVH
; WRDIV: llllllll hhhhhhhh
; l - low byte of unsigned 16-bit dividend
; h - high byte of unsigned 16-bit dividend
; WRDIVB: dddddddd
; d - unsigned 8-bit divisor
; need to wait 16 cycles before reading
; cycles taken to read initial opcode count
; fewer cycles needed if quotient is known to be small?
WRDIVL = $004204
WRDIVH = $004205
WRDIVB = $004206
; H-COUNT TIMER SETTINGS
; $4207 w1 fvha
; $4208 w1 fvha
; hhhhhhhh .......h
; h - IRQ horizontal trigger
HTIME = $004207
HTIMEL = $004207
HTIMEH = $004208
; V-COUNT TIMER SETTINGS
; $4209 w1 fvha
; $420A w1 fvha
; vvvvvvvv .......v
; v - IRQ vertical trigger
VTIME = $004209
VTIMEL = $004209
VTIMEH = $00420A
; DIRECT MEMORY ACCESS CHANNEL DESIGNATION
; $420B w1 fvha
; hgfedcba
; a - DMA channel 0 (0: disabled | 1: enabled)
; b - DMA channel 1 (0: disabled | 1: enabled)
; c - DMA channel 2 (0: disabled | 1: enabled)
; d - DMA channel 3 (0: disabled | 1: enabled)
; e - DMA channel 4 (0: disabled | 1: enabled)
; f - DMA channel 5 (0: disabled | 1: enabled)
; g - DMA channel 6 (0: disabled | 1: enabled)
; h - DMA channel 7 (0: disabled | 1: enabled)
MDMAEN = $00420B
; H-BLANK DIRECT MEMORY ACCESS CHANNEL DESIGNATION
; $420C w1 fvha
; hgfedcba
; a - HDMA channel 0 (0: disabled | 1: enabled)
; b - HDMA channel 1 (0: disabled | 1: enabled)
; c - HDMA channel 2 (0: disabled | 1: enabled)
; d - HDMA channel 3 (0: disabled | 1: enabled)
; e - HDMA channel 4 (0: disabled | 1: enabled)
; f - HDMA channel 5 (0: disabled | 1: enabled)
; g - HDMA channel 6 (0: disabled | 1: enabled)
; h - HDMA channel 7 (0: disabled | 1: enabled)
HDMAEN = $00420C
; ACCESS CYCLE DESIGNATION
; $420D w1 fvha
; .......f
; f - fast rom (0: disabled | 1: enabled)
; Works with SA1, but pauses the SA1.
MEMSEL = $00420D
; V-BLANK NMI FLAG AND SNES CPU VERSION NUMBER
; $4210 r1 fvha
; n... vvvv
; n - vblank NMI trigger (0: not in vblank | 1: in vblank)
; reading $4210 will clear this flag
; read this during NMI for safety
; messing with NMI enable may cause unwanted triggers
; v - Ricoh5A22 version
RDNMI = $004210
; H/V TIMER IRQ FLAG
; $4211 r1 fvha
; i... ....
; i - IRQ trigger (0: no request | 1: IRQ requested)
; reading $4211 will clear this flag
; read this during IRQ or else
; IRQ will trigger immediately when the current one ends
TIMEUP = $004211
; H/V BLANK FLAG AND AUTO JOYPAD READ STATUS
; $4212 r1 fvha
; vh.. ...j
; v - vertical blanking period (0: not vblank | 1: vblank)
; h - horizontal blanking period (0: not hblank | 1: hblank)
; blanking flags are toggled even during fblank
; and irrespective of interrupts
; j - auto joypad read flag (0: fine | 1: busy)
HVBJOY = $004212
; PROGRAMMABLE I/O PORT (READ)
; $4213 r1 fvha
; ab......
; a - pin 6 of controller port 2
; b - pin 6 of controller port 1
RDIO = $004213
; QUOTIENT OF DIVISION
; $4214 r1 fvha
; $4215 r1 fvha
; RDDIVL RDDIVH
; llllllll hhhhhhhh
; l - low byte of quotient
; h - high byte of quotient
RDDIV = $004214
RDDIVL = $004214
RDDIVH = $004215
; PRODUCT OF MULTIPLICATION AND REMAINDER OF DIVISION
; $4216 r1 fvha
; $4217 r1 fvha
; RDMPYL RDMPYH
; llllllll hhhhhhhh
; l - low byte of result
; h - high byte of result
;
; for multiplication, this contains the product
; for division, this contains the remainder
RDMPY = $004216
RDMPYL = $004216
RDMPYH = $004217
; CONTROLLER DATA
; $4218 r1 fvha
; $4219 r1 fvha
; $421A r1 fvha
; $421B r1 fvha
; $421C r1 fvha
; $421D r1 fvha
; $421E r1 fvha
; $421F r1 fvha
;
; JOY1L JOY1H
; JOY1DATA1: AXLRvvvv BYsSudlr
;
; JOY2L JOY2H
; JOY2DATA1: AXLRvvvv BYsSudlr
;
; JOY3L JOY3H
; JOY1DATA2: AXLRvvvv BYsSudlr
;
; JOY4L JOY4H
; JOY2DATA2: AXLRvvvv BYsSudlr
;
; A - A face button (0: relaxed | 1: pressed)
; B - B face button (0: relaxed | 1: pressed)
; X - X face button (0: relaxed | 1: pressed)
; Y - Y face button (0: relaxed | 1: pressed)
; u - UP dpad button (0: relaxed | 1: pressed)
; d - DOWN dpad button (0: relaxed | 1: pressed)
; l - LEFT pad button (0: relaxed | 1: pressed)
; r - RIGHT dpad button (0: relaxed | 1: pressed)
; S - START button (0: relaxed | 1: pressed)
; s - SELECT button (0: relaxed | 1: pressed)
; L - LEFT SHOULDER button (0: relaxed | 1: pressed)
; R - RIGHT SHOULDER button (0: relaxed | 1: pressed)
;
; v - controller signature
; only v bits are put in data
; further data can be read for further controller information
;
; vvvv zzzzzzzz
; 0000 00000000 - No controller connected
; 0000 11111111 - Standard joypad
; 0001 ........ - SNES mouse
; 0011 ........ - SFC modem
; 0100 ........ - NTT data controller (has cool numpad)
; 1101 ........ - Voice-Kun
; 1110 xxxxxxxx - Third-party device
; 1111 ........ - Super Scope
JOY1L = $004218
JOY1H = $004219
JOY2L = $00421A
JOY2H = $00421B
JOY3L = $00421C
JOY3H = $00421D
JOY4L = $00421E
JOY4H = $00421F
;--------------------------------
JOY1DATA1L = $004218
JOY1DATA1H = $004219
JOY2DATA1L = $00421A
JOY2DATA1H = $00421B
JOY1DATA2L = $00421C
JOY1DATA2H = $00421D
JOY2DATA2L = $00421E
JOY2DATA2H = $00421F
;===================================================================================================
;===================================================================================================
; DMA REGISTERS
;===================================================================================================
;===================================================================================================
; DMA TRANSFER PARAMETERS
; $4300 rw1 fvha
; $4310 rw1 fvha
; $4320 rw1 fvha
; $4330 rw1 fvha
; $4340 rw1 fvha
; $4350 rw1 fvha
; $4360 rw1 fvha
; $4370 rw1 fvha
;
; dh.i fmmm
; d - transfer direction (0: A bus to B bus | 1: B bus to A bus)
; h - HDMA addressing (0: direct table | 1: indirect table)
; i - address direction (0: increment address | 1: decrement address)
; f - fixed transfer
; m - transfer mode
; 000 - 1 register, write once r+0
; 001 - 2 register, write once r+0, r+1
; 010 - 1 register, write twice r+0, r+0
; 011 - 2 registers, write twice r+0, r+0, r+1, r+1
; 100 - 4 registers, write once r+0, r+1, r+2, r+3
; 101 - 2 registers, write twice, alt r+0, r+1, r+0, r+1
; 110 - 1 register, write twice r+0, r+0
; 111 - 2 registers, write twice r+0, r+0, r+1, r+1
;
; for write twice modes, the address is still incremented
; assuming a non-fixed transfer
; for fixed transfers, the same address is always used
; even for write twice modes
DMAPX = $004300
DMAP0 = $004300
DMAP1 = $004310
DMAP2 = $004320
DMAP3 = $004330
DMAP4 = $004340
DMAP5 = $004350
DMAP6 = $004360
DMAP7 = $004370
;--------------------------------
DMAXMODE = $004300
DMA0MODE = $004300
DMA1MODE = $004310
DMA2MODE = $004320
DMA3MODE = $004330
DMA4MODE = $004340
DMA5MODE = $004350
DMA6MODE = $004360
DMA7MODE = $004370
;--------------------------------
HDMAXMODE = $004300
HDMA0MODE = $004300
HDMA1MODE = $004310
HDMA2MODE = $004320
HDMA3MODE = $004330
HDMA4MODE = $004340
HDMA5MODE = $004350
HDMA6MODE = $004360
HDMA7MODE = $004370
; DMA B-BUS ADDRESS ACCESS
; $4301 rw1 fvha
; $4311 rw1 fvha
; $4321 rw1 fvha
; $4331 rw1 fvha
; $4341 rw1 fvha
; $4351 rw1 fvha
; $4361 rw1 fvha
; $4371 rw1 fvha
;
; aaaaaaaa
; a - low byte of PPU port $21aa for B bus address
BBADX = $004301
BBAD0 = $004301
BBAD1 = $004311
BBAD2 = $004321
BBAD3 = $004331
BBAD4 = $004341
BBAD5 = $004351
BBAD6 = $004361
BBAD7 = $004371
;--------------------------------
DMAXPORT = $004301
DMA0PORT = $004301
DMA1PORT = $004311
DMA2PORT = $004321
DMA3PORT = $004331
DMA4PORT = $004341
DMA5PORT = $004351
DMA6PORT = $004361
DMA7PORT = $004371
; DMA A-BUS TABLE ADDRESS
; $4302 rw1 fvha
; $4303 rw1 fvha
; $4304 rw1 fvha
; $4312 rw1 fvha
; $4313 rw1 fvha
; $4314 rw1 fvha
; $4322 rw1 fvha
; $4323 rw1 fvha
; $4324 rw1 fvha
; $4332 rw1 fvha
; $4333 rw1 fvha
; $4334 rw1 fvha
; $4342 rw1 fvha
; $4343 rw1 fvha
; $4344 rw1 fvha
; $4352 rw1 fvha
; $4353 rw1 fvha
; $4354 rw1 fvha
; $4362 rw1 fvha
; $4363 rw1 fvha
; $4364 rw1 fvha
; $4372 rw1 fvha
; $4373 rw1 fvha
; $4374 rw1 fvha
;
; A1TxL A1TxH A1Bx
; llllllll hhhhhhhh bbbbbbbb
; l - low byte of A bus address
; h - high byte of A bus address
; b - bank of A bus address
;--------------------------------
A1TX = $004302
A1TXL = $004302
A1T0L = $004302
A1T1L = $004312
A1T2L = $004322
A1T3L = $004332
A1T4L = $004342
A1T5L = $004352
A1T6L = $004362
A1T7L = $004372
;--------------------------------
A1TXH = $004303
A1T0H = $004303
A1T1H = $004313
A1T2H = $004323
A1T3H = $004333
A1T4H = $004343
A1T5H = $004353
A1T6H = $004363
A1T7H = $004373
;--------------------------------
A1BX = $004304
A1B0 = $004304
A1B1 = $004314
A1B2 = $004324
A1B3 = $004334
A1B4 = $004344
A1B5 = $004354
A1B6 = $004364
A1B7 = $004374
;--------------------------------
DMAXADDR = $004302
DMA0ADDR = $004302
DMA1ADDR = $004312
DMA2ADDR = $004322
DMA3ADDR = $004332
DMA4ADDR = $004342
DMA5ADDR = $004352
DMA6ADDR = $004362
DMA7ADDR = $004372
;--------------------------------
DMAXADDRL = $004302
DMA0ADDRL = $004302
DMA1ADDRL = $004312
DMA2ADDRL = $004322
DMA3ADDRL = $004332
DMA4ADDRL = $004342
DMA5ADDRL = $004352
DMA6ADDRL = $004362
DMA7ADDRL = $004372
;--------------------------------
DMAXADDRH = $004303
DMA0ADDRH = $004303
DMA1ADDRH = $004313
DMA2ADDRH = $004323
DMA3ADDRH = $004333
DMA4ADDRH = $004343
DMA5ADDRH = $004353
DMA6ADDRH = $004363
DMA7ADDRH = $004373
;--------------------------------
DMAXADDRB = $004304
DMA0ADDRB = $004304
DMA1ADDRB = $004314
DMA2ADDRB = $004324
DMA3ADDRB = $004334
DMA4ADDRB = $004344
DMA5ADDRB = $004354
DMA6ADDRB = $004364
DMA7ADDRB = $004374
;--------------------------------
HDMAXADDR = $004302
HDMA0ADDR = $004302
HDMA1ADDR = $004312
HDMA2ADDR = $004322
HDMA3ADDR = $004332
HDMA4ADDR = $004342
HDMA5ADDR = $004352
HDMA6ADDR = $004362
HDMA7ADDR = $004372
;--------------------------------
HDMAXADDRL = $004302
HDMA0ADDRL = $004302
HDMA1ADDRL = $004312
HDMA2ADDRL = $004322
HDMA3ADDRL = $004332
HDMA4ADDRL = $004342
HDMA5ADDRL = $004352
HDMA6ADDRL = $004362
HDMA7ADDRL = $004372
;--------------------------------
HDMAXADDRH = $004303
HDMA0ADDRH = $004303
HDMA1ADDRH = $004313
HDMA2ADDRH = $004323
HDMA3ADDRH = $004333
HDMA4ADDRH = $004343
HDMA5ADDRH = $004353
HDMA6ADDRH = $004363
HDMA7ADDRH = $004373
;--------------------------------
HDMAXADDRB = $004304
HDMA0ADDRB = $004304
HDMA1ADDRB = $004314
HDMA2ADDRB = $004324
HDMA3ADDRB = $004334
HDMA4ADDRB = $004344
HDMA5ADDRB = $004354
HDMA6ADDRB = $004364
HDMA7ADDRB = $004374
; DMA SIZE, HDMA WORKING TABLE ADDRESS, AND HDMA INDIRECT TABLE BANK
; $4305 rw1 fvha
; $4306 rw1 fvha
; $4307 rw1 fvha
; $4315 rw1 fvha
; $4316 rw1 fvha
; $4317 rw1 fvha
; $4325 rw1 fvha
; $4326 rw1 fvha
; $4327 rw1 fvha
; $4335 rw1 fvha
; $4336 rw1 fvha
; $4337 rw1 fvha
; $4345 rw1 fvha
; $4346 rw1 fvha
; $4347 rw1 fvha
; $4355 rw1 fvha