The SNES controller is very similar to the NES' standard controller, with a collection of digital inputs that are latched and read in series. With a suitable adapter, reading the SNES controller is like reading an NES controller with 4 extra buttons.
The 16 bit report will read, in order:
0 - B 1 - Y 2 - Select 3 - Start 4 - Up 5 - Down 6 - Left 7 - Right
8 - A 9 - X 10 - L 11 - R 12 - 0 13 - 0 14 - 0 15 - 0
Note that the first 8 values map directly to the original NES controller's 8 inputs (SNES B = NES A, and SNES Y = NES B).
The last 4 bits will always read 0 from a standard SNES controller. Other values here may indicate other devices.
After the 16 bit report, subsequent bits will read as 1.
- Controller port pinout
- Standard controller
- Controller reading
- SNES mouse
- Virtual Boy controller - Has a mostly compatible corresponding bit report.
- FullSNES: SNES Controller Hardware ID Codes