Re: Asteroids daughtercad ????

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:/mkdud/ast/astdc1.jpg
>
>http://members.aol.com:/mkdud/ast/astdc2.jpg
><http://members.aol.com:/mkdud/ast/astdc3.jpg>http://members.aol.com:/mkdud/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 14:48:48 2003