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LPT Switch

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IntruderAlert:

Yeah.. if you click my sig you'll see that it's all run off of a Celeron 500
The red, blue, white, and unused plugins across the top of the picture all go to the CP

The LPT plugs into the port on the left of the XILINX chip

I didn't trace all of the other wires down yet
I was up till 4AM just cleaning the screen, taking and posting pictures, and tracking down a faulty wire.

I'll post more info when I can get back in the cab again

Tiger-Heli:

Not trying to rain on this at all, I think it's a cool idea, but before someone tries to sell it commercially, I would like to point out a couple of other options:

USB - Two GP-Wiz Ecos - $40 and 64 inputs.
PS/2 - http://www.surf.to/buttonbox (approx $30 to build, and 128 inputs in matrixed mode).

Hoagie_one:

yeah, unless teh whole thing clocks at less than $30, its not financially worth it.

But it was fun playing with it

Tiger-Heli:

Another thought - looking at the schematic, it appears that the circuit is using a 12x5  matix with pins 18 to 25 of the connector unused.

Shouldn't it theoretically be possible to just add more diodes and wire and make this into a max 12x13 matrix (156 inputs), (more than the number of keyboard keys), or at least a 12x9 (108 input) controller?

What would need to be modified to make this feasible?

brained:

The driver seems to only handle 60 inputs, maybe you need to modify the driver to handle all the inputs, anyways the drivers are open source so you can probably hack them  :police:

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