I made a version for the pac 4-in-1 mod (version 3.3) for a common bootleg board (Ms Pac Championship/Super Zola Pac Gal). If you have The board pictured below you can mod it with just a couple of simple steps and does not need an nvram adapter like the original Pac boards. Most of them come with the ram socketed which makes it that much easier.
Ms Pac Championship/Super Zola Pac Gal PCB

When you are done it should look like this

Steps
.