Does it make any difference if you short CPU pins 39 and 40 together briefly in the game?
(Topic ID: 285107)
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Quoted from Quench:As I understand the O.P's opening post, he has two -35 boards jumpered for 2716 that boot on the bench but not in the actual game, so they should be jumpered correctly.
I have seen this 3 or so times on Pinside now and it was due to weakly written EPROMs. Programmer verifies ok but in game with a slightly different 5V level they fail. I've experienced the same thing with the TL866 programmer and 2716 chips.
Mongi do you know anyone with an EPROM programmer?
What happens when you try what dothedoo posted?
If the LED goes out your theory is the more likely problem.
If the LED stays lit, it could be a reset/voltage stabilization problem.
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