Re: Millipede to JAMMA? Anyone?

Yea, I have a missile command adapter as well... No problems with that
one. And I have wires for the sound amplification board ready to go on
the millipede adapter as well.... But I have to get the board to boot
first :-(
I do have the resets hooked up as required, so Im a bit confused as to
why its not working :-(

-=Mark=-

peter jones wrote:

>-----Original Message-----
>From: Mark E Davidson <mark@basementarcade.com>
>To: rasterlist@vectorlist.org
>Date: Wed, 23 Nov 2005 09:59:22 -0500
>Subject: RASTER: Millipede to JAMMA? Anyone?
>
>
>
>>Wondering if anyone here has ever successfully made a Millipede to Jamma
>>adapter?
>>
>>
>
>i did it with missile-command.
>
>you need an amplifier - obviously.
>then you need to build a small oscilator using a 555 timer.
>now it get's a bit techy.
>
>to use the trackball inputs you need to understand the principle.
>there are 2 lines per axis.
>1 for pulses, and one that either precedes or foillows the pulse to indicate direction.
>
>luckily the software isnt too fussy about the second signal.
>
>connect the down input to the y-quadrature input through a diode.
>connect the up and down through some diodes to a gate or transister or something that will connect the output from the oscilator to the other y input.
>
>what your after is for stick-up to connect the pulses only, and stick down to connect the pulses and pull the other line low.
>
>if it goes in the wrong direction then swap the up/down connections.
>
>repeat the switching circuit for the x-axis and feed it from the same oscilator.
>
>the speed of the oscilator will determin the speed of movement on the screen.
>
>missile-command is surprisingly playable with a joystick! :-)
>
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Received on Wed Nov 23 10:46:03 2005