Weird PCB attached to C64 ROM

From: Jim Brain <>
Date: Sun, 19 Feb 2012 10:09:04 -0600
Message-ID: <> (last 2 pictures)

I can see Vcc, Gnd, and /CE of the EPROM, which appears stacked on top 
of the original ROM, but the rest eludes me.

Anyone know what this does?


Jim Brain

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