Part 4/5 - Demonstrating how a bad RAM chip can sometimes not even allow the game to get to a point to tell you the chip is bad. This video series shows work on a Bally-Williams WPC-89 MPU board from a Dr. Who pinball machine. The machine would not boot up and indications were the problem was somewhere on the mother board. This series goes into diagnosing and solving the problem and installing NVRAM (non-volatile memory) so that we no longer need batteries. For more visit: [ Ссылка ]
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