===== DB9 Controller Comparison =====
Many systems use a modified Atari pinout for their controllers.  Most of the time it's safe to use any one pad on another, but occasionally changes are made and you definitely want to avoid putting a pad into a system where pressing down shorts +5v to Ground and fries the machine.

{{connectors:con-db9.gif}}

^Pin^Sega 8-bit((SG-1000, Mk3, Master System etc)) ^ J-PC((MSX, X68000, FM-Towns etc)) ^ Amiga ^  MegaDrive ^
|  1  |  Up  |   Up	    |  Up  |  Up  |
|  2  |  Down  |   Down    |  Down  |  Down  |
|  3  |  Left  |   Left    |  Left  |  Left  |
|  4  |  Right  |   Right   |  Right  |  Right  |
|  5  |  +5v  |   +5v	    |  -  |  +5v  |
|  6  |  A  |   A	    |  A  |  A/B  |
|  7  |  -  |   B	    |  +5V  |  OSel((Output Select, switches between different button sets))  |
|  8  |  Ground   |  OUT    |  Ground  |  Ground  |
|  9  |  B  |   Ground  |  B  |  Start/C  |