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snes 65c816 cpu memory map reference · lorom hirom mode switch · ppu registers · cpu dma hdma i/o · address lookup · wram sram rom bank mapping · runs locally

mode

LoROM: ROM in upper 32KB of each bank ($8000–$FFFF). Common: SMW, Zelda ALTTP (early), Metroid.

address lookup

lorom memory map

banksaddressesregion

$00–$3F / $80–$BF$0000–$1FFFWRAM (mirror)

$00–$3F / $80–$BF$2000–$21FFPPU Registers

$00–$3F / $80–$BF$2140–$217FAPU I/O

$00–$3F / $80–$BF$2180–$2183WRAM I/O

$00–$3F / $80–$BF$4016–$4017Joypad

$00–$3F / $80–$BF$4200–$420DCPU I/O

$00–$3F / $80–$BF$4210–$421FCPU Status / Joypad

$00–$3F / $80–$BF$4300–$437FDMA/HDMA

$00–$3F / $80–$BF$6000–$7FFFSRAM / Expansion

$00–$3F / $80–$BF$8000–$FFFFLoROM — ROM (lo banks)

$40–$6F$0000–$FFFFLoROM — ROM (hi banks)

$70–$77$0000–$7FFFSRAM (LoROM)

$7E$0000–$FFFFWRAM (lo)

$7F$0000–$FFFFWRAM (hi)

$C0–$FF$0000–$FFFFLoROM — ROM (fast)

i/o registers

addrrwnamedescription

$2100WINIDISPScreen display: brightness (0–15) and forced blank

$2101WOBSELOBJ size and base address in VRAM

$2102WOAMADDLOAM address low (7 bits)

$2103WOAMADDHOAM address high + priority rotation

$2104WOAMDATAOAM data write (auto-increment)

$2105WBGMODEBG mode (0–7) and character size per BG

$2106WMOSAICMosaic enable per BG and mosaic pixel size

$2107WBG1SCBG1 tilemap address and mirror (32×32 or larger)

$2108WBG2SCBG2 tilemap address and mirror

$2109WBG3SCBG3 tilemap address and mirror

$210AWBG4SCBG4 tilemap address and mirror

$210BWBG12NBABG1 (lo nibble) and BG2 (hi nibble) character data address

$210CWBG34NBABG3 (lo) and BG4 (hi) character data address

$210DWBG1HOFSBG1 horizontal scroll (13-bit, write twice: lo then hi+flags)

$210EWBG1VOFSBG1 vertical scroll

$210FWBG2HOFSBG2 horizontal scroll

$2110WBG2VOFSBG2 vertical scroll

$2111WBG3HOFSBG3 horizontal scroll

$2112WBG3VOFSBG3 vertical scroll

$2113WBG4HOFSBG4 horizontal scroll

$2114WBG4VOFSBG4 vertical scroll

$2115WVMAINVRAM address increment mode and step size

$2116WVMADDLVRAM word address low

$2117WVMADDHVRAM word address high

$2118WVMDATALVRAM data write low byte

$2119WVMDATAHVRAM data write high byte

$211AWM7SELMode 7 settings: H/V flip, screen fill outside tilemap

$211BWM7AMode 7 matrix A (cos θ · scale; write twice)

$211CWM7BMode 7 matrix B (−sin θ · scale; write twice)

$211DWM7CMode 7 matrix C (sin θ · scale)

$211EWM7DMode 7 matrix D (cos θ · scale)

$211FWM7XMode 7 center X (write twice)

$2120WM7YMode 7 center Y (write twice)

$2121WCGADDCGRAM (palette) address

$2122WCGDATACGRAM data write (BGR555, write two bytes)

$2123WW12SELWindow mask settings for BG1 and BG2

$2124WW34SELWindow mask settings for BG3 and BG4

$2125WWOBJSELWindow mask settings for OBJ and Color window

$2126WWH0Window 1 left position

$2127WWH1Window 1 right position

$2128WWH2Window 2 left position

$2129WWH3Window 2 right position

$212AWWBGLOGWindow logic operation for BG1–4 (OR/AND/XOR/XNOR)

$212BWWOBJLOGWindow logic operation for OBJ and Color

$212CWTMMain screen layer enable (BG1–4, OBJ)

$212DWTSSubscreen layer enable

$212EWTMWMain screen window mask enable

$212FWTSWSubscreen window mask enable

$2130WCGWSELColor addition: main/sub clip, fixed/sub color source

$2131WCGADSUBColor math control: per-layer enable and add/subtract mode

$2132WCOLDATAFixed color data for color math (R/G/B channels separately)

$2133WSETINIScreen init: interlace, OBJ interlace, overscan, pseudo-hires

$2134RMPYLSigned multiply result low (M7A × M7B >> 8)

$2135RMPYMSigned multiply result middle

$2136RMPYHSigned multiply result high

$2137RSLHVSoftware latch H/V counter (reading latches OPHCT/OPVCT)

$2138RRDOAMOAM data read

$2139RRDVRAMLVRAM data read low

$213ARRDVRAMHVRAM data read high

$213BRRDCGRAMCGRAM data read

$213CROPHCTHorizontal scanline counter (9-bit, read twice for full value)

$213DROPVCTVertical scanline counter (9-bit)

$213ERSTAT77PPU1 status: sprite overflow/0-hit flags + chip version

$213FRSTAT78PPU2 status: interlace field + external H/V latched flags