Weird PCB attached to C64 ROM

From: Jim Brain <brain_at_jbrain.com>
Date: Sun, 19 Feb 2012 10:09:04 -0600
Message-ID: <4F411EA0.6070605@jbrain.com> 
http://allegro.pl/commodore-64-c-2-os-y-i2077847284.html (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

-- 
Jim Brain
brain@jbrain.com
www.jbrain.com


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