Quoted from Markz:
Someone mentioned upgrading ROM's. Anyone have any good links/ advice here? (how to check what I have now, where to find new ones, etc)
The ROM version is listed on the first screen when you boot the machine. Mine says 742/5 with GPROM Checksum 89AA.
There are 5 ROMs and they are not all at the same version. Chances are you will only have to change the GPROM.
arom1.bin
drom1.bin
dsprom3.bin
gprom5.bin
yrom1.bin
There is a sticker showing you the ROM locations on the boards, look for it in the lower left corner of the back metal plate in the head. There should be a sticker on the ROM chip itself telling you its version.
The copyright owner enforces his copyright on these ROMs. That does not help much if they run out of stock.
Have you ever played virtual pinball like pinmame? It is as if you are playing on a real machine.
Don't expect this will solve your problem though. For me, it helped fix some screen display issues especially when scrolling.