did you run the same procedure on the E42K (at 40MHz)? seems like the L88M is hotter?!
I need to run it using this (slightly more) refined process to replace those initial results—I was just excited to have access to this thermal camera I think... In addition to an inconsistent warm-up, I just turned it off when it hit ~75 C. I'll let it get higher with the testing, just to see.
I think the big x-factor is the fact this is an "LRC" sku. I'd like to see this test done on an MC68040RC40 L88M. I doubt I'll be able to get one on loan : P
As far as older mask revs, TL;DR it was a mask rev E31F that came on
both my Centris 650's 25 MHz CPU, the Quadra's 33 MHz sample; ergo
it exists.
Looking at the Motorola
"High-Performance Internal Product Portfolio Overview" document (the document I believe you're referring to), I think by "cancelled" they actually meant "deprecated" or "retired." 1995 was the introduction of the E42K mask, i.e. the fully-qualified 68040. But we
know that other mask revs listed there
were used. So it's likely a report that any stock of the older rev masks were likely retired from sales/shipping. I.e. all purchases would
not be from the mask revs marked "cancelled."
EDIT:
here's the PDF
Whether a 40 MHz rated version of that mask rev was produced should be the actual question to ask. Look at Bolle's post earlier on in the thread and see if the accompanying markings correspond at all.
I'm planning on testing the remainder of my 040s (I won't go beyond 90 C on ANY test; I'll indicate the time interval from boot to (my) max temp)
I've been thinking about trying this seller, miantaxia-0. Has anyone tried this one?
https://www.ebay.com/itm/323076959423
At risk of breaking rules, that looks fake/shady AF, personally. The additional indicator markings are missing along the left-hand side. Haven't purchased from them.
EDIT: that's not sure-fire, but it's suspect to me.