I bought a used A1200T with FULL 060, Mediator, etc.

The cpu command says it is a 68060 with FPU + MMU.

I happily used this system for years...

Now the battery died so I took out the card today and what to my surprise...

I see the CPU says XC68EC060RC50 (!)

My Motorola books tell me that the EC means "no FPU, no MMU"

Yet when I compile floating point code for FPU it goes faster than compiling nonFPU code (SASC)

How is this possible?!?

Also my Mediator works perfectly, well... reasonably well

Doesn't Mediator require MMU?

Why does my trusty AmigaOS 3.9 say I have FPU+MMU but Motorola says I do not?

Have I been ripped off?

I'M SO CONFUSED!!!!!!!!


p.s. I found this on a website:
An "X" prefix in a Motorola part number designates a "Pilot Production Prototype". These are from a limited production volume of prototypes manufactured, tested and Q.A. inspected on a qualified technology to simulate normal production. These parts have only preliminary reliability and characterization data.

XC is also or better was also the code for chips made for japanese oriented "custom" devices. For example a Motorola CPU with custom I/O for PDA. Just to differentiate it from the glory Motorola brand for customers.

Motorola sold full 68060s without testing the MMU + FPU part. As they didn't guaranty a working MMU + FPU, they labelled them as EC.

Bye,
Thomas

It is a full 060 with MMU + FPU otherwise CPU wouldn't report it to be
so and FPU software would'nt run.  Trust your results not the chip
marking.
I have one labled as XC68EC060RC60 a 60Mhz part but all my FPU and MMU
software runs fine.

As far as I know the only FPU less 060's were the 75MHz+ parts which
were produced on a smaller fabrication.

Uh, sure, they will do 60 MHz or, depending on the exact make, more. If you are a proficient overclocker you may get rates in excess of 66 MHz w/o too much trouble.

@DonnyEMU

Okay, you must be reading very old motorola books , because seriously EC doesn't mean the same thing as it did on 020 and 030 chips..

Excuse me?

He is perfectly correct about the EC060: That means the CPU doesn't have FPU or MMU.

Obviously it seems the CPU has been labeled wrong.

Indeed EC did mean different thing with 020. There it means the CPU had 24bit address bus (020 doesn't have FPU or MMU). 030 doesn't have FPU anyway, so there EC means: no MMU. But I can't see anything being mentioned about this, only the correct conclusion that EC060 means "no FPU, no MMU".

Also, if the CPU command reports that you have an MMU you do..

CPU command lies about MMU with some EC030 chips.