Jeff Walther wrote:

>>"XC" should read "MC", meaning Motorola, not "XC", and the "LC" will be
>>absent on a full function chip
>Motorola often substitutes an 'X' for the 'M' in early runs of their 
>chips.  I forget the exact explanation of the meaning, but it's 
>something like, this was an experimental run, and they're good enough 
>to sell, but it's not full final production.   It probably affects 
>the price and/or the contract between Motorola and the buyer somehow, 
>but doesn't seem to have much impact on the end user.
>>Such a full function chip would read: "MC68040RC33B", and this would decode
>>as follows:
>You will also find full function 68040s with the part number 
>XC68040RC40 for example.
>I've also seen quite a few PPC processors from Motorola with XPC 
>instead of MPC.  The Umax 233 MHz PPC604e card, e.g., has XPC604E 
>chips on them--at least one batch of them did.
I do believe that if you check 90% or better of all the processors of 
any kind that Motorola made for Apple they will all begin with "X".  If 
you find a "MC68040RC33B" try plugging it in the where an "XC68040RC33B" 
was.  You will be very unpleasantly surprised.....


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