Re: What's the IIe's--Arghh!--MHz Speed?

[kloesch@nauticom.net (Kevin Loesch)]

        All 6502 chips require at least two cycles per instruction, one for 
the execution and on to fetch the next instruction. The 65816 could prcocess 
an instruction in one cycle since it was a pipelined processor(As long as the 
current instruction wasn't a branch or jump). 

In article <19990117135402.24395.00002805@ng-fa1.aol.com>, supertimer@aol.com 
(Supertimer) wrote:
>The important thing to remember about Apple II speed is that the
>Mhz are unique to the 65Cxx family of CPUs.  These processors,
>starting with the 65C02, are sometimes considered early RISC chips.
>Compare a 65C02 to a Z80 or an 8088/8086, for example, and you
>notice that for some instructions, the 65C02 can execute in as little
>as a single CPU cycle whereas the Z80 or 8088/8086 takes 4 or
>more.  Thus, realistically, that 1Mhz IIe runs as fast as the original
>4.77Mhz IBM PC.

Kevin Loesch
kloesch@nauticom.net	
http://www.nauticom.net/www/kloesch

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