🚀 go-pugleaf

**** FLAME ON ****

In article <122@motsj1.UUCP> rich@motsj1.UUCP (Rich Goss) writes:
>In article <5635@shemp.UCLA.EDU> fan@CS.UCLA.EDU (Roy Fan) writes:
>>--------------

<<Edited out.>>

The above is all OK but, the rest of this appears to be pure propaganda
which I have the feeling is normal policy for motorola as most of the
advertizing seems to run down competitors products by quoting misleading
information such as what follows.  Besides this is the ncs 32k group and
not a place to advertize motorla cpu's.

I was involved in a project using the Zilog Z8000 processor a few years
back and recieved literature from motorola at that time makeing fantastic
claims for their chip and virtually lieing about the limitations of the 
Z8000 (just for example they claimed the Z8000 could only address 64k bytes
when in fact it was 8meg not including split I/D possiblities).

>One should look at the potential for a particular MMU scheme being
>incorporated in future generation of processors. You should look
>at the 286 MMU and the 386 MMU. They are not compatible. The MMU
>in the 68030 is compatible with the 68851 PMMU chip.
>
As far as I am aware (without doing much research) it is a subset, not a
superset (ie. downward compatable).  Further the Compaq 386 runs XENIX 286
from the box so how uncompatable can the 386 MMU be?  Agreed it has more
features than the 286 but you don't have to recode applications before you
can use the 386!

>As to whether an MMU should be on chip with the CPU depends on
>the application. The 68030 is an excellent choice for work
>staions and systems which support multitasking and/or multiuser
>operating systems. The 68020 is a good choice for the above
>when coupled with the 68851 PMMU or the users own MMU. Also the
>68020 is an excellent choice for embedded controller applications

Some more edited out here.
>
>-- Rich Goss
>Motorola Western Regional Field Applications Engineer for 68000
>Family

The Z8000 was a fantastic chip for embedded controller applications capable
of handling the interupt rate from a floppy disc controller for example
without DMA support.

I guess the fact that he works for motorola gives him an interest in
promoting motorola's products, but I do get tired of how far they stretch
the truth sometimes.

ps. The above should not be taken to indicate a preference for any of
    motorola or intel products.  I actually prefer the national cpus
    myself (but use both intel and motorola).
-- 
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