Super Nintendo Famicom SNES controller to MSX / MSX2 / Sharp X1 X68000 / FM-Towns adapter

SNES controller can be used on Japanese computers of the 80s-90s.

The circuit is supplied by 5V and the current consumption is < 20mA.

Compatibility:

MSX / MSX 2

Fujitsu FM-77 / FM Towns

NEC PC-88

Sharp X1 / X68000

BOM list https://www.digikey.com/en/mylists/list/K6ZD5Y9GTR

Additional items to make your adapter:

https://www.aliexpress.com/item/4000281809514.html?spm=a2g0s.9042311.0.0.74844c4d8RoLg7

Default:

Trigger A is the SNES B button, Trigger B is the SNES X button.

Setup SNES 1~6 are enabled by holding buttons on the SNES controller when turning the computer ON.

1 /FORWARDForward

2 /BACKBackward

3 /LEFTLeft

4 /RIGHTRight

5 +5V+5 VDC (50mA max)

6 /TRG1Trigger A / Output 1

7 /TRG2Trigger B / Output 2

8 OUTPUTOutput 3

9 GNDSignal Ground

Note:

The direction is Computer relative joystick.

Signals 1-2-3-4-6-7 are active Low (internal 10K~22K pull-up resistors exist inside the machine).

Depends on the model, the female D-Sub9 needs trimming with a Dremel tool to fit the joy port.

Thanks to Raphael Assenat for the firmware explanation.