Quoted from hobbypin:Installing correctly and it boots when I put the original back in.
1. Make sure the notch is in the right place, I know you said it was installed correctly, but there's been an overwhelming number of posts that the label being right side up on the eprom and not the notch on the eprom makes it correct.
Is the Prototype eprom that works only a 2 Meg and not a 4 Meg? The board may have to be rejumpered for 4 Meg eproms.
Remove batteries, open coin door, change eprom, power up without closing coin door and without batteries.
Gilroy, CA
