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No Longer Available Williams System 4 MPU
- Thread starter BrianSoton
- Start date
OP
OP
Me too but not an expert I’m afraid, you’d need to check Clay’s Guide
OP
OP
Bump
The difference between Level 4 and Level 6 boards? The main technical improvement between the two is that Lev. 6 games have a 'Memory Protect' switch operated by the coin door, with the Cpu board altered to accommodate it. There are a few crossover games (e.g. Gorgar, Laser Ball) that can use L4 boards with enough sockets as a replacement, allowing for the lack of the Memory Protect facility. AIUI, it was brought in to prevent the settings being altered with the door closed, f'r instance in the event of battery failure.
