Re: Asteroids daughtercad ????

I can't find the darn pictures! I'll keep looking and if/when I do I'll let
your guys know.

John :-#(#

At 10:54 PM 20/03/2003 +0000, lonewolfpdx3@attbi.com wrote:

>I'd be interested.. always wondered why some boards looked unchanged, yet
>played at different speeds....
> > There were some interesting kits sold back in the early 80's that allowed
> > one to speed up the game. I recall hearing of one that changed the speed
> > automatically. Check if the IRQ control IC has any cut pins, that is where
> > they fit in the speed up normally.
> >
> > We used to do it with the two of the unused 4 Dip Switch switches and tied
> > them to the 74193 (? - I have to check that) IRQ clock divider pins that
> > were tied to ground, and with a couple of pull-up resistors one could get
> > quite a nice speed up of the game. I have a picture I think of the last
> > board I did this to if anyone is interested...
> >
> > John :-#)#
> >
> > At 04:18 PM 20/03/2003 -0500, MKDUD@aol.com wrote:
> >
> >
> > >I'm trying to repair an Asteroids board with VSM troubles. This board has
> > >what I'm guessing to be a "speed up" daughtercard mounted to the board.
> > >See Pics:
> > >
> > ><http://members.aol.com:/mkdud/ast/astdc1.jpg>http://members.aol.com:/m
> kdud/ast
> > /astdc1.jpg
> > >
> > >http://members.aol.com:/mkdud/ast/astdc2.jpg
> > ><http://members.aol.com:/mkdud/ast/astdc3.jpg>http://members.aol.com:/m
> kdud/ast
> > /astdc3.jpg
> > >
> > >Does anybody know anything about these daughtercards? This one is etched
> > >"Sonic 1B-2001-022" on the back. It has one modwire going to the cathode
> > >side of CR1 (1N914) near the reset button, another going to pin "C" of
> the
> > >edge connector, and power wires +5 and Gnd.
> > >Why would this wire go to pin "C" of the edge connector? For a switch in
> > >the cabinet, perhaps?
> > >I was wondering how these cards worked (overclocking, I guess), and if it
> > >could screw up the VSM. Also, does anybody have a VSM debug proceedure
> for
> > >Asteroids?
> > >
> > >Thanks,
> > >Michael Kelley
> >
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Received on Thu Mar 20 16:37:14 2003