I have some non-working The Invaders pcbs, that I want to modify to the "3 rom" version.
Is there anybody who did this before and can help me to explain what to do step by step.
I already have modified pcbs, but they are not identical, one has 2516 the other 2716 eproms and on top of that, they are in different positions on the 2 pcbs.
Is it just burning some eproms and place some sockets or more complicated?
The 2 modidied pcbs:

The 2516 and 2716 eproms in different locations

And the whole lot
