Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!bloom-beacon!apple!keith
From: keith@Apple.COM (Keith Rollin)
Newsgroups: comp.sys.mac
Subject: Re: Pierce Explains RISC. was new mac rumors
Message-ID: <26439@apple.Apple.COM>
Date: 27 Feb 89 14:13:10 GMT
References: <161@biar.UUCP> <9795@cit-vax.Caltech.Edu>
Organization: Apple Computer Inc, Cupertino, CA
Lines: 22

In article <9795@cit-vax.Caltech.Edu> wetter@cit-vax.Caltech.Edu (Pierce T. Wetter) writes:
>>>     The speed of a mircoprocessor is somewhat proportional to the number
>>>of instructions it has to implement. For instance the 6502 can do every 
> >>instruction in one clock cycle, while the 68000 can take up to 70.
>  > 
>> Many 6502 instructions are >1 cycle long, as a glance at any 6502 programming
> > manual will quickly confirm.  The true speed of any processor is
>
>    Ooops, sorry. I meant many 6502 instructions take ~ 1 cycle. I obviously
>didn't expect a multiply to run in one cycle.

You're digging in deeper. To wit:

- ALL 6502 instructions take at leat 2 cycles (even NOP).
- There is no multiply instruction.

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