Advice on 68060 purchase wanted

[Iggy]

An RC60 costs about twice what an RC50 can be had for. However, if you want at least 60Mhz I'd buy an RC60 and not worry to much about revision. You'll probably manage 66Mhz.

[Iggy]

All the recommendations regarding specific masks are quite correct, but they ignore fishy_fiz's stated goals. If all he wants is 60 or 66Mhz, why would he hunt down a processor that would sell for  a premium?
An RC60 can be had for under $90 (if you're not worried about the revision).

[Iggy]

Because some RC60's are EC meaning they don't have a working FPU. I think all RC66's & RC75's are EC and have no working FPU. They may have FPU in them, and some may have an FPU which works at 75MHz but the EC means they were sold as not having a FPU. Some are LC meaning no FPU or MMU. It is a minefield.


You can get an  for $90 if you wait a short time. Plus the peace of mind that it has both an FPU and MMU and clocks to 60MHz without heatsink or fan.

I'm finding all of this fascinating as my company stopped build systems with 68K processors before the '060 came out (our last model used an '030).
If you or Franko can find some references that lists each mask by features it could prove very useful.
Right now the only one you've mentioned that I can be sure has an FPU and MMU is the MC68060RC50 E41J. But I'd also like some info on RC60, RC66, and RC75 masks.

[Iggy]

That has been the most helpful response. I remember receiving XC labeled components from Motorola during sampling and in early production.

[Iggy]

OK, so the cheap Chinese RC50 and RC60 components on Ebay are 0.60um XC components.
And I assume ideally I'd want a non EC RC60 with a 0.32um 71E41J mask.