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From: rra202@uiucuxa.CSO.UIUC.EDU
Newsgroups: net.micro.apple
Subject: Re: stuff in general
Message-ID: <9800034@uiucuxa>
Date: Thu, 9-Oct-86 00:05:00 EDT
Article-I.D.: uiucuxa.9800034
Posted: Thu Oct  9 00:05:00 1986
Date-Received: Tue, 14-Oct-86 05:40:46 EDT
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Nf-From: uiucuxa.CSO.UIUC.EDU!rra202    Oct  8 23:05:00 1986


    Written in responce 2 to this note.

Don't be silly. There are very important differences that you are
ignoring when you talk about processor speed. Processor speed (when
measured in Mhz) is relative!!! A 4 Mhz Z-80 (CP/M processor) is
as fast as a 1 Mhz 6502. Those 3.5 Mhz Apple-turbocards speed up the
Apple to about 1.5-2x faster than a PC....the speed at which a processor
operates is only useful information when you are talking about the
same family of microprocessors.
 
               (my text now)

I don't think a 6502 has a 4-1 advantage over a Z80. A 6502 has an 
advantage because it does a full read in a cycle, unlike a Z80 
which puts the address on the bus in one cycle and reads the data
in the next. But that's only a two to one advantage. And all the 
benchmarks I read seem to say about a 2x advantage, which is what you
would think from my remarks.

   I run a 6502 at 2Mhz in my Commodo 128. It seem to be about 20% slower
than an IBM PC.