Pac-Man chip set

farquh

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I have the following chart that tips you off to what chip set your Pac-Man machine has.

To see what setup you have watch the demo, if Pac-Man gets caught by:

Inky, lower left = original chip, difficulty jumper not connected
Clyde, lower left = original chip, difficulty jumper connected

Pinky, above ghost box = modified chip, difficulty jumper not connected
Inky, lower right = modified chip, difficulty jumper connected

I recently had some excellent restoration work done to my Pac-Man pcb, but now during the demo I am eaten by the blue ghost in the upper left corner...the only problem is I don't see that option on the chart!!

Can anyone help?
 
Something else I just thought of -

Since I got the board back from repair, the Free Play mode now has 'motion' and shows a demo screen. Before the restoration, when the dip switch was set to Free Play, there was just a black back ground still screen that showed that characters and listed the scoring system.

Does this tell anyone anything?
 
I'm guessing the free play mod changed something in the randomness of the blue ghosts (or maybe just the regular ghost logic) enough that it changed the demo. I think one of the psuedo-random seeds was taken from an area where the ghost names are stored, which makes Puckman (which has different ghost names) have slightly different patterns than Pac-Man. I can't remember where I read that though, probably on one of the forums.
 
Something else I just thought of -

Since I got the board back from repair, the Free Play mode now has 'motion' and shows a demo screen. Before the restoration, when the dip switch was set to Free Play, there was just a black back ground still screen that showed that characters and listed the scoring system.

Does this tell anyone anything?

Free plpay with teh original stock chip set would give you a still screen. You must have a new chip set that has attract screen and free play both, together. Its what many people want, thus must chip sets are programmed this way. You can go back to just the still attract screen by getting I think its 6F programmed to not have free play and attract.

I just went through this when I added a high score save kit. I replaced 6F and my attract screen was "still" on free play. I then had to return the chips for one that would allow free play with attract screen.
 
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Something else I just thought of -

Since I got the board back from repair, the Free Play mode now has 'motion' and shows a demo screen. Before the restoration, when the dip switch was set to Free Play, there was just a black back ground still screen that showed that characters and listed the scoring system.

Does this tell anyone anything?

Tells me someone put my chip in. lol
 
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