RE: Space Invaders

Phil.

This is your problem, change the resistors to 150ohm, I bet you it will
work, I've had this about 5 times except once, on taito L-shape SI pcbs.

Andy Welburn
www.andys-arcade.com

> -----Original Message-----
> From: techtoolslist-bounces@flippers.com [mailto:techtoolslist-
> bounces@flippers.com] On Behalf Of Phil Morris
> Sent: 15 April 2005 22:35
> To: Technical Tools Mail List
> Subject: Re: [Techtoolslist] Space Invaders
>
>
>
> >Did you check the power levels with the Fluke pod in? Seems like I
heard
> >that it draws more power than the CPU. Also, maybe you have a weak
> component
> >in the CPU circuit, since adding the pod changes trace lengths, power
> >loading, etc. does it not?
>
> Well, some success - seems that lowering the +5VDC line to +4.5VDC
gets
> one
> boardset to run via the Fluke - the other one still won't play ball
though.
>
> I'm wondering if it's something to do with the clock ..... the two
> resistors that interface with the 7404 at 7B and the crystal are,
> according
> to the schematics, supposed to be 330 ohms. However, on the boardset
that
> WILL work via the Fluke they are both 150 ohms, yet on the boardset
that
> won't work via the Fluke they are 330 ohms and 1K
>
> I don't feel like experimenting with swapping them out right now, but
> maybe
> this is the cause.
>
>
>
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Received on Fri Apr 15 15:17:08 2005