The MV1A MVS boards have two [PAL] PAL20V8H-15 chips which are used to provide some of NEO-C1's functions. If any of them fails, the board certainly won't start up.

They can be replaced with new or working chips programmed with the following JEDEC files:

SNK1A

Does some address decoding. Pin 1 might be AS instead of RW.

JEDEC file: File:SNK1A.zip

SNK1B

Generates the DTACK signal.

JEDEC file: File:SNK1B.zip

MV1A PALs

SNK1A

SNK1B

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