PRO-CT0

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PRO-CT0 9020KX032 on an MV-4 MVS system, as a graphics serializer
PRO-CT0 9042KX023 on an AES cart PROG board as a security chip

PRO-CT0 are early SDIP64 GAL (Gate Array Logic) chips used as:

Internal designs

Known PRO-CT0 markings to be of the graphics chip type: 9020KX032, ...

Marking of SNK-9201's: 9246EX020, 9247EX010, 9247EX007, 2947EX029

Marking of PRO-CT0's on AES PROG PCBs: 9042KX023