Re: circuit idea / help needed...


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Posted by Bill Lash on September 14, 1999 at 00:39:41:

In Reply to: circuit idea / help needed... posted by =-JacK-= on September 13, 1999 at 23:10:02:

: I recently acquired a spinner from a junked-out Major Havoc and a 2 ¼ trackball from a junked-out Missile Command, complete with optical encoder circuit boards and Molex plugs. A schematic of the encoder can be found at: http://www.geocities.com/SiliconValley/Lakes/9862/encoder.html . Here is what I want to do:

: I use a hacked keyboard for my arcade control interface. I want to develop a circuit to turn the quadrature signal of the optical encoders into a "open/close" signal that I can wire into my keyboard to simulate a keypress. My idea is to leave the spinner and trackball OEM and not have to mess with analog sensitivity in MAME. I am more of an electrician than an electrical engineer, so I feel I can build the circuit, just not design it. I realize HAPP sells a serial port interface kit, but I really want to keep my inputs on the keyboard.

There is (or was) a circuit designed by Stephan Hans that would basically do this for a spinner. You should be able to use two such circuits to do a trackball. As I remember, I looked through the design, and it seemed that it ought to work. Unfortunately, the URL that used to work gives me a blank page right now. The link that saint has is http://www.st-hans.de/tricks.htm but as I said, it doesn't seem to work right now. A mention of the circuit is at the link below.



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