How CPU's work (was Re: Hi, I'm new...)

Ray Arachelian ray at arachelian.com
Sun Aug 6 21:41:36 CDT 2006


Roy J. Tellason wrote:
> On Sunday 06 August 2006 06:50 pm, Ray Arachelian wrote:
>   
>> A far cleaner approach would be to use 32 bit registers to begin with.
>> Then, you're not limited to 16 bit segments, nor do you have to worry
>> about segments.  See the 68000.
>>     
>
> Which is exactly why I have one or two of those chips around with the thoughts 
> of maybe someday playing with them,  a thought that I've *never* had with 
> regard to the x86 parts,  which I'll just _use_ as a part of an already-made 
> system
Absolutely.  The 68000 is an amazing little chip when you compare it to
the 6800 and 6502's that it evolved itself from.  You can sort of get a
feel from this from this journal:
http://linux.monroeccc.edu/~paulrsm/dg/dg.htm  DTACK Grounded was a
Journal that was pushing a plug in board to Commodore Pet's and Apple
II's and possibly other 8 bit systems to enable a 68000 to run inside of
them.  The differences between the 68K and the host they live inside of
are huge.

It's worth a read to get a feel of the excitement the 68K caused back in
the day when it was introduced.  Some of it is very funny, there's one
issue where the author compares an Intel FPU to the 68000 running
software floating point routines, and guess what, the 68000 actually ran
FASTER!  :-)




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