Sega Master System Controller

The Master System uses a modified Atari 2600 pinout. No special components are needed.

PinFunction
1 Up
2 Down
3 Left
4 Right
5 +5v
6 Button I
7 TH
8 Ground
9 Button II

Tiny numbers can be found on most DB9 connectors; they're small but they're there. Be careful not to wire things backwards!