did an "ok" first job of surface mount soldering! (no I am not ready to post a picture! sorry! ) triple checked and there's no solder bridge, 3 pings to the right place chip)
changed the one closest to the jamma connector ... and now all games load with the eeprom error ... so I know it *is* related and probably the right chip to change!
now I am wondering if the chip I got is ok.
the original is :
what I got is
on the bag:
on the chip:
now as far as I can tell, the first one might be a 5.0 while the 2.7 has a lower vcc start but does not go higher then 5.5v so it should not be a problem ?
5.0 (VCC = 4.5V to 5.5V)
2.7 (VCC = 2.7V to 5.5V)
My question is really should I even get chips that are not 2.7 ?