nes attribute calc — free browser tool | fatcousin

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nes nametable attribute table calculator · tile to attribute byte mapping · quadrant palette selection · 32x30 tile grid · attribute address lookup · all 4 nametables · runs locally

nametable

tile lookup

tile x (0–31)

tile y (0–29)

attribute byte index0 (byte 0 of 64 in attr table)

ppu address$23C0

tile is in quadrant0 — top-left (bits 1-0)

current palette0 → BG palette 0 ($3F00–$3F03)

attr byte value$00 = 00000000

attribute byte editor (selected block)

Attr byte 0 at $23C0 — covers tiles (0–3, 0–3)

top-left

palette 0

bottom-left

palette 0

top-right

palette 0

bottom-right

palette 0

result byte$000000000076=TL · 54=TR · 32=BL · 10=BR (bit pairs in reverse display order)

attribute grid (8×8 blocks, click to select)

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attribute table reference

table size64 bytes (8×8 blocks, one byte per 4×4 tile region = 32×32 pixels)

address (NT0)$23C0–$23FF (nametable at $2000)

address (NT1)$27C0–$27FF (nametable at $2400)

address (NT2)$2BC0–$2BFF (nametable at $2800)

address (NT3)$2FC0–$2FFF (nametable at $2C00)

byte formulaindex = (tileY ÷ 4) × 8 + (tileX ÷ 4)

bit layoutbits 1-0 = top-left · bits 3-2 = top-right · bits 5-4 = bottom-left · bits 7-6 = bottom-right

palette basespal 0=$3F00 · pal 1=$3F04 · pal 2=$3F08 · pal 3=$3F0C