Matt Mc_Carthy wrote in a message to Wayne Chirnside:

 WC> Ok I've never seen a Pentium MMX or any other CPU
 WC> with contacts on the top of the microprocessor.

 MMC> Nor have I!  The original Pentium series was a "PGA", Pin Grid
 MMC> Array type chip.  A large reddish colored ceramic square with all
 MMC> the pins under it.  Later they came up with the smaller black
 MMC> pinless plastic chip intended to be soldered directly onto MBs,
 MMC> but instead soldered to a small PCB with all the pins on it to be
 MMC> used in the socket motherboards.  This was (I think) the "PFPG"
 MMC> chip, Plastic Flat Pinless Grid chip soldered onto an adapter
 MMC> board.  What I think you are seeing is the top ends of all the
 MMC> pins sticking through the adapter PCB.  If that is the case, the
 MMC> tops of the pins should be well below the top of the CPU itself,
 MMC> and a regular heatsink that uses a flat strap to snap onto the
 MMC> tabs of the socket should work fine.  The bottoms of the heatsinks
 MMC> are normally anodized, and are non-conductive, unless the
 MMC> anodizing has been machined off. 

This echos my thoughts on the matter,  too.  Of the two 200MHz machines I
have here,  the chip in the primary linux box is a K6-200 which is as you
describe,  with the tops of the pines below the level of where the heatsink
is located.  The other is a P200,  and in the usual ceramic case.

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