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interfacing with game port - how?

The //e and IIGS both have two game ports, a DB9 on the back and a 16-pin 
DIP port on the motherboard.  I know the pinouts, but I don't have much 
experience with this sort of thing... I want to interface external TTL 
logic devices with the 3 or 4 bits in/out available on the DIP port.

Does anyone have schematics or even just helpful tips on how to go about 
this?  Any advice will be greatly appreciated (and, if I ever get it 
working, I'll post it to the web...)  Thanks,

-- Joe Strout

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|    Joseph J. Strout           Department of Neuroscience, UCSD   |
|    jstrout@ucsd.edu           http://www-acs.ucsd.edu/~jstrout/  |
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