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A 'once and for all' declaration regarding L88M mask MC68040 CPUs

MrFahrenheit

Well-known member
I’ve purchased 2x 68040 40mhz from the eBay seller “Eric Woo’s Rare Chips”. The listing title says 02E31F but the photo shows 02E42K. Either way I can see what arrives for those interested in sourcing a 68040 40 chip. They are $50 plus $6 shipping.
 

pax

Well-known member
I’ve purchased 2x 68040 40mhz from the eBay seller “Eric Woo’s Rare Chips”. The listing title says 02E31F but the photo shows 02E42K. Either way I can see what arrives for those interested in sourcing a 68040 40 chip. They are $50 plus $6 shipping.

🍿
 

nickpunt

Well-known member
Check the other numbers in the lower left corner. As far as my data collection goes those do give away the mask as well.
As far as I can tell it's like this:

D98D ends with -010
E31F ends with -001
E42K ends with -101
K63H have seen them with both -104 and -103
L88M ends with -104
Interesting, my 'L88M' with Motorola markings (date code 0430, acquired from UTsource in 2014) has the code S23159-001. It runs quite cool at 33mhz and I'm inclined to think it's genuine. Meanwhile The Freescale 68040LRC40As that @jessenator and I have are S23159-104, and it looks like many/most 68040s even the XCs use the tag S23159.
 
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Fizzbinn

Well-known member
Interesting, my 'L88M' with Motorola markings (date code 0430, acquired from UTsource in 2014) has the code S23159-001. It runs quite cool at 33mhz and I'm inclined to think it's genuine. The 'S23159' is also identical to what @jessenator and I have on our Freescale 68040LRC40As, except they end in -104.

Can you quantify “quite cool”?
 

jessenator

Well-known member
Freescale MC68040LRC40 running in my Quadra 650 with MacClip Jr set at 40 MHz

It started off after boot here:
Qe6co5b.jpg


After MB CPU, FPU tests then a quick jump into APD to confirm the clock speed and run a system benchmark:
6HxceVh.jpg


I kinda called it quits after it started getting close to 75 C and didn't bother to see if it got higher.


edit: these JPG exports are super low-quality... Maybe I'll save out PNGs for the next CPU. This is a full-on Fluke TiR 32 I'm borrowing from my brother-in-law (he used to be in inspections, so he could justify it :p )
 

jessenator

Well-known member
Also, I need to learn how to use this thing more proficiently before I go posting things :ROFLMAO: clearly I didn't focus the other test image correctly. And I can have it export things like timecodes, so you can see the differential by a more empirical metric than "roughly" so...but I still haven't set the clock, so it's reverted to 2011 or something lol. Still the time differential is now present in the exports.

At any rate, here's the Motorola E42K MC68040RC40
vvP6L5G.png
d1KDywB.png
 
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