THE (FAILED) SOLUTIONS
The stock P60/P66 type 4 complex will look like one of the folowing two:
The type of processor socket on the P60/P66 complex is known as a
low-insertion-force "Socket 4". The socket voltage is 5V and has a grid of 273 pins:
Intel's Pentium 120/133 Overdrive part BOXPODP5V133 fits nicely on there:
but doesn't allow the machine to power up to POST. There are reports from fellow MADman Jim Shorney
that he occasionally does see the POST start though, so maybe there's some hope.
This next part is Powerleap's upgrade adapter for socket 4 platforms:
The part name is PL54C-MMX and can be bought with or without a processor. This is quite a sophisticated adapter
that theoretically allows one to upgrade a Pentium 66 to a 233MHz Pentium MMX.
Unfortunately, I've had no luck whatsoever with it on any of my complexes. The
plan now is to send it to Jim Shorney and let him have a go at it. Maybe a combination of
interposers and adapters will yield better results.
Here are some excellent pics of Intel's interposer courtesy of Jim Shorney:
Disclaimer: As with all other contents on this site describing modifications that may
boost the performance of your hardware, the author(s) are only describing methods that
are for the most part "experimental" in nature. Some of these modifications will void
your manufacturers' warrantee, and at worst may also permanently damage your hardware.
If you choose to perform any of these modifications, please do so understanding these
risks, as the author(s) cannot be held liable for any loss or damage that may result.