Quoted from polyacanthus:Hey guys, just wanted to say thanks for figuring this out. I have done the old method several times on system 9 without issue. I recently did the same thing on my Data East which promptly smoked! I redid it with the voltage divider and it's working great. Thanks!
Would be interesting to sit down and try and figure out why the voltage divider is required for DE games but WMS games seems to work fine without it. From a quick glance seems like DE should behave like WMS. I did this mod to probably over 100 wms 3-6 driver boards with FQP17P06 and never had trouble with the mosfets or the to92 pre driver getting blown out.