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

{{connectors:con-db9.gif}}

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

  * The 'TH' line is used as the photo diode input for the Light Phaser.
  * This pad uses a pinout similar to many others.  There is a comparison of MSX, Sega, Atari and other connectors [[sega_atari_MSX_x68000|on this page]]. 

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