; SNES Register Aliases ; Address Bus B Registers INIDISP = $2100 ; Screen Display Register single write any time OBSEL = $2101 ; Object Size and Character Size Register single write f-blank, v-blank OAMADDL = $2102 ; OAM Address Registers (Low) single write f-blank, v-blank OAMADDH = $2103 ; OAM Address Registers (High) single write f-blank, v-blank OAMDATA = $2104 ; OAM Data Write Register single write f-blank, v-blank BGMODE = $2105 ; BG Mode and Character Size Register single write f-blank, v-blank, h-blank MOSAIC = $2106 ; Mosaic Register single write f-blank, v-blank, h-blank BG1SC = $2107 ; BG Tilemap Address Registers (BG1) single write f-blank, v-blank BG2SC = $2108 ; BG Tilemap Address Registers (BG2) single write f-blank, v-blank BG3SC = $2109 ; BG Tilemap Address Registers (BG3) single write f-blank, v-blank BG4SC = $210A ; BG Tilemap Address Registers (BG4) single write f-blank, v-blank BG12NBA = $210B ; BG Character Address Registers (BG1&2) single write f-blank, v-blank BG34NBA = $210C ; BG Character Address Registers (BG3&4) single write f-blank, v-blank BG1HOFS = $210D ; BG Scroll Registers (BG1) dual write f-blank, v-blank, h-blank BG1VOFS = $210E ; BG Scroll Registers (BG1) dual write f-blank, v-blank, h-blank BG2HOFS = $210F ; BG Scroll Registers (BG2) dual write f-blank, v-blank, h-blank BG2VOFS = $2110 ; BG Scroll Registers (BG2) dual write f-blank, v-blank, h-blank BG3HOFS = $2111 ; BG Scroll Registers (BG3) dual write f-blank, v-blank, h-blank BG3VOFS = $2112 ; BG Scroll Registers (BG3) dual write f-blank, v-blank, h-blank BG4HOFS = $2113 ; BG Scroll Registers (BG4) dual write f-blank, v-blank, h-blank BG4VOFS = $2114 ; BG Scroll Registers (BG4) dual write f-blank, v-blank, h-blank VMAIN = $2115 ; Video Port Control Register single write f-blank, v-blank VMADDL = $2116 ; VRAM Address Registers (Low) single write f-blank, v-blank VMADDH = $2117 ; VRAM Address Registers (High) single write f-blank, v-blank VMDATAL = $2118 ; VRAM Data Write Registers (Low) single write f-blank, v-blank VMDATAH = $2119 ; VRAM Data Write Registers (High) single write f-blank, v-blank M7SEL = $211A ; Mode 7 Settings Register single write f-blank, v-blank M7A = $211B ; Mode 7 Matrix Registers dual write f-blank, v-blank, h-blank M7B = $211C ; Mode 7 Matrix Registers dual write f-blank, v-blank, h-blank M7C = $211D ; Mode 7 Matrix Registers dual write f-blank, v-blank, h-blank M7D = $211E ; Mode 7 Matrix Registers dual write f-blank, v-blank, h-blank M7X = $211F ; Mode 7 Matrix Registers dual write f-blank, v-blank, h-blank M7Y = $2120 ; Mode 7 Matrix Registers dual write f-blank, v-blank, h-blank CGADD = $2121 ; CGRAM Address Register single write f-blank, v-blank, h-blank CGDATA = $2122 ; CGRAM Data Write Register dual write f-blank, v-blank, h-blank W12SEL = $2123 ; Window Mask Settings Registers single write f-blank, v-blank, h-blank W34SEL = $2124 ; Window Mask Settings Registers single write f-blank, v-blank, h-blank WOBJSEL = $2125 ; Window Mask Settings Registers single write f-blank, v-blank, h-blank WH0 = $2126 ; Window Position Registers (WH0) single write f-blank, v-blank, h-blank WH1 = $2127 ; Window Position Registers (WH1) single write f-blank, v-blank, h-blank WH2 = $2128 ; Window Position Registers (WH2) single write f-blank, v-blank, h-blank WH3 = $2129 ; Window Position Registers (WH3) single write f-blank, v-blank, h-blank WBGLOG = $212A ; Window Mask Logic registers (BG) single write f-blank, v-blank, h-blank WOBJLOG = $212B ; Window Mask Logic registers (OBJ) single write f-blank, v-blank, h-blank TM = $212C ; Screen Destination Registers single write f-blank, v-blank, h-blank TS = $212D ; Screen Destination Registers single write f-blank, v-blank, h-blank TMW = $212E ; Window Mask Destination Registers single write f-blank, v-blank, h-blank TSW = $212F ; Window Mask Destination Registers single write f-blank, v-blank, h-blank CGWSEL = $2130 ; Color Math Registers single write f-blank, v-blank, h-blank CGADSUB = $2131 ; Color Math Registers single write f-blank, v-blank, h-blank COLDATA = $2132 ; Color Math Registers single write f-blank, v-blank, h-blank SETINI = $2133 ; Screen Mode Select Register single write f-blank, v-blank, h-blank MPYL = $2134 ; Multiplication Result Registers single read f-blank, v-blank, h-blank MPYM = $2135 ; Multiplication Result Registers single read f-blank, v-blank, h-blank MPYH = $2136 ; Multiplication Result Registers single read f-blank, v-blank, h-blank SLHV = $2137 ; Software Latch Register single any time OAMDATAREAD = $2138 ; OAM Data Read Register dual read f-blank, v-blank VMDATALREAD = $2139 ; VRAM Data Read Register (Low) single read f-blank, v-blank VMDATAHREAD = $213A ; VRAM Data Read Register (High) single read f-blank, v-blank CGDATAREAD = $213B ; CGRAM Data Read Register dual read f-blank, v-blank OPHCT = $213C ; Scanline Location Registers (Horizontal) dual read any time OPVCT = $213D ; Scanline Location Registers (Vertical) dual read any time STAT77 = $213E ; PPU Status Register single read any time STAT78 = $213F ; PPU Status Register single read any time APUIO0 = $2140 ; APU IO Registers single both any time APUIO1 = $2141 ; APU IO Registers single both any time APUIO2 = $2142 ; APU IO Registers single both any time APUIO3 = $2143 ; APU IO Registers single both any time WMDATA = $2180 ; WRAM Data Register single both any time WMADDL = $2181 ; WRAM Address Registers single write any time WMADDM = $2182 ; WRAM Address Registers single write any time WMADDH = $2183 ; WRAM Address Registers single write any time ; Old Style Joypad Registers JOYSER0 = $4016 ; Old Style Joypad Registers single (write) read/write any time that is not auto-joypad JOYSER1 = $4017 ; Old Style Joypad Registers many (read) read any time that is not auto-joypad ; Internal CPU Registers NMITIMEN = $4200 ; Interrupt Enable Register single write any time WRIO = $4201 ; IO Port Write Register single write any time WRMPYA = $4202 ; Multiplicand Registers single write any time WRMPYB = $4203 ; Multiplicand Registers single write any time WRDIVL = $4204 ; Divisor & Dividend Registers single write any time WRDIVH = $4205 ; Divisor & Dividend Registers single write any time WRDIVB = $4206 ; Divisor & Dividend Registers single write any time HTIMEL = $4207 ; IRQ Timer Registers (Horizontal - Low) single write any time HTIMEH = $4208 ; IRQ Timer Registers (Horizontal - High) single write any time VTIMEL = $4209 ; IRQ Timer Registers (Vertical - Low) single write any time VTIMEH = $420A ; IRQ Timer Registers (Vertical - High) single write any time MDMAEN = $420B ; DMA Enable Register single write any time HDMAEN = $420C ; HDMA Enable Register single write any time MEMSEL = $420D ; ROM Speed Register single write any time RDNMI = $4210 ; Interrupt Flag Registers single read any time TIMEUP = $4211 ; Interrupt Flag Registers single read any time HVBJOY = $4212 ; PPU Status Register single read any time RDIO = $4213 ; IO Port Read Register single read any time RDDIVL = $4214 ; Multiplication Or Divide Result Registers (Low) single read any time RDDIVH = $4215 ; Multiplication Or Divide Result Registers (High) single read any time RDMPYL = $4216 ; Multiplication Or Divide Result Registers (Low) single read any time RDMPYH = $4217 ; Multiplication Or Divide Result Registers (High) single read any time JOY1L = $4218 ; Controller Port Data Registers (Pad 1 - Low) single read any time that is not auto-joypad JOY1H = $4219 ; Controller Port Data Registers (Pad 1 - High) single read any time that is not auto-joypad JOY2L = $421A ; Controller Port Data Registers (Pad 2 - Low) single read any time that is not auto-joypad JOY2H = $421B ; Controller Port Data Registers (Pad 2 - High) single read any time that is not auto-joypad JOY3L = $421C ; Controller Port Data Registers (Pad 3 - Low) single read any time that is not auto-joypad JOY3H = $421D ; Controller Port Data Registers (Pad 3 - High) single read any time that is not auto-joypad JOY4L = $421E ; Controller Port Data Registers (Pad 4 - Low) single read any time that is not auto-joypad JOY4H = $421F ; Controller Port Data Registers (Pad 4 - High) single read any time that is not auto-joypad ; DMA/HDMA Registers DMAP0 = $4300 ; (H)DMA Control Register BBAD0 = $4301 ; (H)DMA Destination Register A1T0L = $4302 ; (H)DMA Source Address Registers A1T0H = $4303 ; (H)DMA Source Address Registers A1B0 = $4304 ; (H)DMA Source Address Registers DAS0L = $4305 ; (H)DMA Size Registers (Low) DAS0H = $4306 ; (H)DMA Size Registers (High) DASB0 = $4307 ; HDMA Indirect Address Registers A2A0L = $4308 ; HDMA Mid Frame Table Address Registers (Low) A2A0H = $4309 ; HDMA Mid Frame Table Address Registers (High) NTLR0 = $430A ; HDMA Line Counter Register DMAP1 = $4310 ; (H)DMA Control Register BBAD1 = $4311 ; (H)DMA Destination Register A1T1L = $4312 ; (H)DMA Source Address Registers A1T1H = $4313 ; (H)DMA Source Address Registers A1B1 = $4314 ; (H)DMA Source Address Registers DAS1L = $4315 ; (H)DMA Size Registers (Low) DAS1H = $4316 ; (H)DMA Size Registers (High) DASB1 = $4317 ; HDMA Indirect Address Registers A2A1L = $4318 ; HDMA Mid Frame Table Address Registers (Low) A2A1H = $4319 ; HDMA Mid Frame Table Address Registers (High) NTLR1 = $431A ; HDMA Line Counter Register DMAP2 = $4320 ; (H)DMA Control Register BBAD2 = $4321 ; (H)DMA Destination Register A1T2L = $4322 ; (H)DMA Source Address Registers A1T2H = $4323 ; (H)DMA Source Address Registers A1B2 = $4324 ; (H)DMA Source Address Registers DAS2L = $4325 ; (H)DMA Size Registers (Low) DAS2H = $4326 ; (H)DMA Size Registers (High) DASB2 = $4327 ; HDMA Indirect Address Registers A2A2L = $4328 ; HDMA Mid Frame Table Address Registers (Low) A2A2H = $4329 ; HDMA Mid Frame Table Address Registers (High) NTLR2 = $432A ; HDMA Line Counter Register DMAP3 = $4330 ; (H)DMA Control Register BBAD3 = $4331 ; (H)DMA Destination Register A1T3L = $4332 ; (H)DMA Source Address Registers A1T3H = $4333 ; (H)DMA Source Address Registers A1B3 = $4334 ; (H)DMA Source Address Registers DAS3L = $4335 ; (H)DMA Size Registers (Low) DAS3H = $4336 ; (H)DMA Size Registers (High) DASB3 = $4337 ; HDMA Indirect Address Registers A2A3L = $4338 ; HDMA Mid Frame Table Address Registers (Low) A2A3H = $4339 ; HDMA Mid Frame Table Address Registers (High) NTLR3 = $433A ; HDMA Line Counter Register DMAP4 = $4340 ; (H)DMA Control Register BBAD4 = $4341 ; (H)DMA Destination Register A1T4L = $4342 ; (H)DMA Source Address Registers A1T4H = $4343 ; (H)DMA Source Address Registers A1B4 = $4344 ; (H)DMA Source Address Registers DAS4L = $4345 ; (H)DMA Size Registers (Low) DAS4H = $4346 ; (H)DMA Size Registers (High) DASB4 = $4347 ; HDMA Indirect Address Registers A2A4L = $4348 ; HDMA Mid Frame Table Address Registers (Low) A2A4H = $4349 ; HDMA Mid Frame Table Address Registers (High) NTLR4 = $434A ; HDMA Line Counter Register DMAP5 = $4350 ; (H)DMA Control Register BBAD5 = $4351 ; (H)DMA Destination Register A1T5L = $4352 ; (H)DMA Source Address Registers A1T5H = $4353 ; (H)DMA Source Address Registers A1B5 = $4354 ; (H)DMA Source Address Registers DAS5L = $4355 ; (H)DMA Size Registers (Low) DAS5H = $4356 ; (H)DMA Size Registers (High) DASB5 = $4357 ; HDMA Indirect Address Registers A2A5L = $4358 ; HDMA Mid Frame Table Address Registers (Low) A2A5H = $4359 ; HDMA Mid Frame Table Address Registers (High) NTLR5 = $435A ; HDMA Line Counter Register DMAP6 = $4360 ; (H)DMA Control Register BBAD6 = $4361 ; (H)DMA Destination Register A1T6L = $4362 ; (H)DMA Source Address Registers A1T6H = $4363 ; (H)DMA Source Address Registers A1B6 = $4364 ; (H)DMA Source Address Registers DAS6L = $4365 ; (H)DMA Size Registers (Low) DAS6H = $4366 ; (H)DMA Size Registers (High) DASB6 = $4367 ; HDMA Indirect Address Registers A2A6L = $4368 ; HDMA Mid Frame Table Address Registers (Low) A2A6H = $4369 ; HDMA Mid Frame Table Address Registers (High) NTLR6 = $436A ; HDMA Line Counter Register DMAP7 = $4370 ; (H)DMA Control Register BBAD7 = $4371 ; (H)DMA Destination Register A1T7L = $4372 ; (H)DMA Source Address Registers A1T7H = $4373 ; (H)DMA Source Address Registers A1B7 = $4374 ; (H)DMA Source Address Registers DAS7L = $4375 ; (H)DMA Size Registers (Low) DAS7H = $4376 ; (H)DMA Size Registers (High) DASB7 = $4377 ; HDMA Indirect Address Registers A2A7L = $4378 ; HDMA Mid Frame Table Address Registers (Low) A2A7H = $4379 ; HDMA Mid Frame Table Address Registers (High) NTLR7 = $437A ; HDMA Line Counter Register