Re: Paul was right

>If someone ever did a new rotary encoder board for the Sega games,
>you could probably scrunch the D flop,counter, buffer down to one
>22v10 as well..

This is kinda what I was thinking, but a little different approach. I have
a need/desire for a single PCB that accepts a quadrature-type input and
spits out the following:

Sega "g-80" type binary counter output
Omega Race type grey-code
TTL level quadrature outputs
Clock and direction type outputs (like Arkanoid uses)
(Maybe) Midway MCR type spinner outputs (haven't looked at this)

The Sega "G-80" type is pretty simple-- I think it's easiest to just use
the original circuit with 74ls393's.

Omega Race strikes me as being a little Atmel 2051 microcontroller that
just parallel outputs the grey-code from a lookup table using the
quadrature inputs as an input to an internal counter for a pointer.

TTL level quadrature outputs are really just the input signal passed
through. Maybe buffer it to be safe.

Clock and Direction are easily output by the 2051 by using the XOR trick on
the quadrature inputs.

The Midway stuff (like for Kick) I haven't looked at in a while. I seem to
recall it was a counter-based system kinda like the G-80. I could be wrong
though.

Anyway, it's a pretty small board-- maybe half an dozen chips and a bunch
of header connectors.

I'll probably prototype one sometime, but I'm still busy playing catch-up
on the ESB and G-80 Multigame stuff...

-Clay

Clayton N. Cowgill Engineering Manager
_______________________________________________________________________
/\ Diamond Multimedia Systems, Inc. clay@supra.com
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Received on Thu Jul 24 15:09:05 1997