[rescue] newest rescue

John Hudak jjhudak at gmail.com
Tue Feb 2 20:10:43 CST 2016

IDK if it was ever stated but, one could make the argument that the 68K was
inspired by the PDP11 ISA and the memory mapped I/O.  Some ppl have said
that the 32-bit 68K was the 'extension' of the 16bit PDP11...there are some
similarities and also differences.  DEC would argue that the vax (virtual
address extension) was the extension of the PDP11, e.g. a machine with a
memory space that would take it 25 years to outgrow (according to the
design requirements of the time).  I don't agree with that, in that
learning the VAX assembly language gave me a real headache - no way could I
remember all the different seemingly different bit settings....Not as easy
compared to the PDP11 ISA.

On Tue, Feb 2, 2016 at 8:53 PM, Lionel Peterson <lionel4287 at gmail.com>

> Didn't one 'inspire' the other architecture?
> Lionel
> > On Feb 2, 2016, at 7:18 PM, John Hudak <jjhudak at gmail.com> wrote:
> >
> > The 68030 cpu was,
> > as a CISC architecture, very good. It was analogous to the PDP11 CPU hw
> > architecture at the time.
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