Actually EVERY 040 chip I have ever seen says XC, not MC.

 ------ From: Quadlist, Sat, Dec 28, 2002 ------ 

> >  >"XC" should read "MC", meaning Motorola, not "XC", and the "LC" will 
>be
> >>absent on a full function chip.
> >>
> >>Such a full function chip would read: "MC68040RC33B", and this would 
>decode
> >>as follows:
> >>
> >>MC - Motorola
> >>68040 - it's an '040 (D'oh)
> >>RC - ceramic, pin-through-hole package
> >>33 - 33/66 MHz (33 MHz CPU, using a 66 MHz oscillator)
> >>B - second revision of the mask set
> >>
> >There is a Motorola trademark on the chip.  Is the "XC" only
> >on the "LC" chip
>
>'XC' denotes a chip that isn't fully qualified (similar to a beta
>release in software). 'RC' is the prefix for the final silicon.


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