Re: Asteroids add-on board

Doug Jefferys wrote:
>
> Once upon a time, Kgowland@aol.com wrote:
> >
> > Hey guys, I have one of those boards. I found it in a machine but it was not
> > installed. Funny thing is that I was going to ask about it tonight...weird.
> > Anyways, it looks like a timer that speeds up gameplay based on time rather
> > than level.
>
> Hmm, looking back at Al's rate multiplier comments, and thinking about
> the LS161, suppose it's a counter, and the switches are geared to speed
> things up after the increments are passed.
>
> IIRC, there's a software-readable counter in Asteroids. Might come
> from the same LS161 that triggers the NMI. Might have something to
> do with that. What components are on this beast? (I'm curious that
> it plugs into a DIP switch, which tells me that the setting is being
> read by software. Are there ROM modifications on the Asteroids board
> that go with the daughterboard?)
>
> Later,
> Doug.
>
> --
> Douglas W. Jefferys |
> Star Data Systems |
> Email: djeffery@multipath.com |

There was no need for changing the game roms, everything just ran
FASTER. If would get real interesting at 8X speed...usually 2X or maybe
4X was the most we ever did. Our addon was simpler than the one Al
(etc.) are speaking of, we just used a couple of the switches on a dip
switch that was unused, and wired them to change the clock on the NMI.
An automatic change would have been nicer...

John :-#)#

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