SNESdev Wiki, “PPU registers”

Cite as: SNESdev Wiki, “PPU registers”
Original: https://snes.nesdev.org/wiki/PPU_registers
sha256: 803042c28b4429142d2f96397545ef019a1b3f76c792e7af1104f31e8a968745
Version: oldid 1507
Archived: https://snes.nesdev.org/w/index.php?title=PPU_registers&oldid=1507
Accessed: 2026-10-21
Licence: CC0 (the wiki's footer, "Content is available under CC0 Public Domain unless otherwise noted")
Credit: SNESdev Wiki editors (snes.nesdev.org); see the page history.
Notes: Read from revision 1507. Used for BGMODE and the Mode 7 matrix registers M7A to M7D.

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The SNES PPU draws up to four background layers in one of eight modes; Mode 1, the most common, has two 16-color layers (BG1 and BG2) and a 4-color BG3 that can be raised above them, often for a HUD or text box.	`BGMODE - BG mode and Character size ($2105 write)`	Wiki
Mode 7 has a single background layer, a 128 by 128 tile map of 256 8 by 8 tiles (1,024 by 1,024 pixels) that the PPU transforms by a 2 by 2 matrix, M7A to M7D (`$211B`-`$211E`, 8.8 fixed point), about a center set by M7X and M7Y.	`M7A - Mode 7 matrix A and Multiplication factor 1 ($211B write twice)M7n - Mode 7 matrix C-D ($211D-211E write twice)M7X - Mode 7 center X ($211F write twice)`	Wiki