Meaning of "architecture width" - Re: 68K Macs with MacOS 7.5 still in production use...
jnc at mercury.lcs.mit.edu
Sat Sep 17 14:45:29 CDT 2016
> From: Guy Sotomayor Jr
> Why? What does the width of the ALU have to do with the "bitness" of
> the architecture? If the programmer's view is 8-bits .., what does it
> matter (other than performance) what the width of the internal data
> paths or ALU are?
> It's interesting from an implementation point of view but not really
> anything else.
What he said (and others made the same point).
When talking about processors, "Architecture" = 'what the programmer sees'.
> From: Fred Cisin
> There are more than a hundred different parameters involved. There is
> no definitive agreement as to which parameter is to be used for the
> classification, nor even which parameterS. ... a product that has one
> classification by one parameter, and a different classification by
> another parameter, there will be disputed classifications, since
> different parameters are more or less important to each viewer.
And this too.
(Which is why, for the 68K, I listed several of the main user-visible
parameters, and noted that they were all 32 bits.)
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