Pacman too fast?

The "difficulty jumper" only adjusts the time the ghosts stay blue, afaik.
Your problem is the clock is running too fast. It could be a hardware hack or an issue in the clock circuit. I had a board doing the same thing once and it was just a shorted lead on the bottom side of the pcb.
I have come across the hardware hack a handful of times. It was how they used to speed them up before the speedup chip was made.

On my pac-man, it did make pac-man move slightly faster initially. When I undid this, god it was slow. Also, the patterns i was reading up on did not work at all, but after removing the mod, they work great.
 
Hey guys, I had a Ms. Pacman PCB with a jumper wire going from one of the daughter boards to a pin on a chip in the main board. Depending on which leg you solder it to, the different speeds you can "choose" but this was not a factory intention as it made sounds, animations, literally EVERYTHING go 4x faster as it messed with the clock speed rather than changing variables. It took me a while to figure it out and just removing the wire killed the game. I fixed it later that day, but I forget what I did to correct it.

I might be able to dig up some pictures.
 
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Found it:

"Hack 2

Clip Pin 11 on 8C (74LS74).
Run a wire jumper from the chip side of the clipped pin 11 to pin 12 at 5S.
This will double the speed of your game, if you were to use pin 11 at 5S you would have 4X, pin 10 at 5S would be 8X etc."

Source: http://lawnmowerman.rotheblog.com/#speedUpsOver

Now I remember. I removed the jumper wire as stated, plugged it in, nothing. Looked it up and read about it after a few hours of searching and realized that the leg was probably clipped - it was. Using solder I re-added the path to the leg from the board, and voila. :)
 
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