I picked up a Commodore 64 a while ago that had this special board
inside.  It was inserted between the keyboard and the motherboard.  IE.
it had a connector that plugged into the keyboard rolex connector on the
motherboard and then the keyboard ribbon cable plugged into it.  Then it
had a 9-pin male D-type connector than came out the back of the C64.  My
guess is that it was for a numeric keypad or something.  I forgot what
was stamped on the circuit board.  Any ideas?
Sam
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Computer Historian, Programmer, Musician, Philosopher, Athlete, Writer, Jackass