Anything more happening on this?
I've just come into possession of a M537 (5/24/97S) (05/29/97-VXPro-UMC8670-2A5LAH09C-00) with unknown PWB Revision (until I open the case

) here at work. Currently has a P-166 in it and a working L2 (verified with CTCM and CacheChk). Might use it to replace my M520 (if the IT boys will give me an MMX CPU for it

).
Any reports from ekoing or Jan?? How about you Rainbow??