Re: What Is The Difference Between 68000 Chip And 80x86 Chip?

[pausch@saaf.se (Paul Schlyter)]

In article <NsVO7.6768$ak4.1690757@typhoon.san.rr.com>,
OneLouder <edayaxwellmay@exoboxway.omcay> wrote:
 
 
> Take the 6502 for example - you can add an immediate value to the A
> register, but not to the X and Y registers.  In the 68K way of doing things,
> all three would be able to do the same things.
 
As a matter of fact, on the x86 you can also add immediate values both
to the accumulator and the index registers, as well as to most other
CPU registers.  Starting with the 386, the x86 improved considerably
on orthogonality.
 
> In general, I think purists would say the very orthogonal Motorola design
> was easier to write software for, particularly software generated through
> compilation.  On the other hand, Intel was very aggressive with
> manufacturing and marketing, and, in a fateful decision we all live with
> today, won the all-important design win with the IBM PC int he early 1980s.
> Note that IBM almost chose Motorola, but Intel was able to show they had the
> manufacturing capacity that Motorola didn't have to meet the expected
> demand.
 
Wasn't the reason IBM PC went Intel the availability of the 8088,
while the 68008 wasn't yet available?  IBM considered the 8-bit
external data bus attractive, since ot made constructing the
motherboard simpler and cheaper.
 
-- 
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Paul Schlyter,  Swedish Amateur Astronomer's Society (SAAF)
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