[Coco] Sega Genesis Gamepad on CoCo

[Andrew]

> Message: 1
> Date: Mon, 6 Jul 2009 10:15:59 +1000
> From: "Bob Devries" <devries.bob at gmail.com>
> Subject: Re: [Coco] Sega Genesis Gamepad on CoCo
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> Message-ID: <7B551BF0A2694A839B6FA00B2450525D at master>
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> 	reply-type=original
> 
> There's a description, including schematic of the Sega pad here:
> 
> http://gamesx.com/wiki/doku.php?id=controls:megadrive_genesis_controller_3

Hmm - from that schematic and description, that's about how I remember 
it from the days of trying to get one to work on an Amiga. IIRC, someone 
figured it out and got it working on an Amiga with software (I can't 
remember the specifics, but the Amiga's joystick port if I remember had 
an output line that could be toggled).

This would explain why it is behaving somewhat oddly - probably the chip 
in some manner is floating high or low (?) on the output, toggling it? 
Or something like that.

It would probably be best just to rip that chip out of an old controller 
(I see them all the time at Goodwill) and re-wire it.

What would also be neat, though, would be to build an interface (similar 
to the hires dongle?) that plugged into the joystick port and/or the 
serial/cassette port, and gave you as many inputs as you needed. Of 
course, it wouldn't work with existing software without patching, so it 
may be a mostly useless thing at this point...

-- Andrew L. Ayers, Glendale, Arizona