On Dec 14, 2004, at 10:36 AM, M. Adam Davis wrote:

> The 8086 was a simple 16 bit processor
> The '286 added speed and larger memory space
and an MMU.  A sucky MMU, but still...
>
> The '386 was 32 bits, and more speed (SX added on-chip L1 cache)
The 386sx was a 16bit external bus (sorta like 8088 vs 8086), it was
also the first x86 to support "virtual machines."  I don't think any
of the original 386's had on-chip cache...

> The '486 was pipelined with more speed (cache was doubled, FSB != cpu 
> speed)
The 486 added an on-chip Floating point unit (earlier chips used an 
external
co-processor.)

Hmm.  This is reasonable:

http://www.lowendpc.com/tech/

"Great Microprocessors of the Past and Present (V 13.4.0)"
http://www.sasktelwebsite.net/jbayko/cpu.html

BillW

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