Re: Space Invaders Tilt error

Thanks for that. I'll check on that tonight. I know it's a board problem,
as the SI I have doesn't have provisions for a tilt/slam switch on the coin
door, and my other boardset same rev. works fine.

Kevin

On Fri, May 25, 2012 at 5:02 PM, Chris Loggans <cloggans@yahoo.com> wrote:

> Kevin,
>
> I went through the same thing and if your schematics are like mine,
> they don't show where the tilt switch is connected. I ended up tracing it
> out at one point and here is what I found:
>
> The tilt switch input comes in on pin 4 of the right hand connector of the
> sound board. It goes through a resistor and capacitor like all other
> switch inputs and terminates at pin 5 of B2. It then goes out on pin 6 of
> B2 and connects to pin 4 of B3. The schematics incorrectly show that pin 4
> on B3 is connected to the +5 volt line that is pulling up all port 0 (P0x)
> inputs, but it is not. B3 is a multiplexer that puts the status of the
> tilt switch on the MX buss when the port 2 inputs are probed. If there was
> a problem with the MX buss, your game would probably be dead so you
> shouldn't need to look any further than B3. Hopefully that gives you a
> good place to start looking.
>
> Good luck,
> -Chris
>
> --- On *Mon, 5/21/12, Kevin Moore <talon.k@gmail.com>* wrote:
>
>
> From: Kevin Moore <talon.k@gmail.com>
> Subject: RASTER: Space Invaders Tilt error
> To: rasterlist@vectorlist.org
> Date: Monday, May 21, 2012, 12:35 PM
>
>
> I know I've seen this solution somewhere but for the life of me I cannot
> find it. Got a SI that's showing title error. The schematics don't show a
> tilt circuit so I'm guessing it was not implemented. Power Supply good, cab
> good as I've swapped board sets and no problem there.
> I'm betting there is either a shorted trace or chip on the motherboard,
> just not sure where to start looking.
> Thanks
> Kevin
>
>

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Received on Sat May 26 08:17:53 2012