[rescue] Another fine business decision for us axp-lovers
rescue at sunhelp.org
Mon Jun 25 00:17:05 CDT 2001
Im not certain whether they are limited or not. However, there are a
large number of articles on the web about how the G4 is a 64 bit processor.
I did not find any thing on earlier PPC processors, it could be that they
are 32 bit chips on a 64 bit bus, as upon closer inspection of the everymac
site it has them listed as 64bit bus systems.
----- Original Message -----
From: "Joshua D. Boyd" <jdboyd at cs.millersville.edu>
To: <rescue at sunhelp.org>
Sent: Monday, June 25, 2001 3:34 PM
Subject: Re: [rescue] Another fine business decision for us axp-lovers
> I don't remeber seeing 64bit registers though when I was poking around PPC
> assembly, so how do they justify calling it 64bit?
> Darn it, now I'm going to have to dig up some PPC ASM info.
> OK, so a brief skim reveals 32int registers, and 32float registers.
> That's nice. It has 32bit instructions. That's also nice (albiet
> standard for RISC machines I'm told). OK, from one tutorial I'm reading
> (http://www.lightsoft.co.uk/Fantasm/Beginners/Chapt1.html), it says that
> doubles can only be handled through the FPU. That would seem to indicate
> that general registers are only 32bit, but still looking for specific
> OK, further down the same page, it said that the general registers are
> 32bits wide.
> So, we have 32bit instructions, and 32bit general registers. Just like
> x86. We also have 64bit FPU registers, also like x86. And we have a
> 128bit bus. Well, I know that Socket7 chips have a 64bit bus, I don't
> remeber if that was expended on the P6 core or not.
> So, what justifies calling a PPC in an Apple a 64bit machine?
> Or, is the PPC just being throttled like a 386 in 16bit mode?
> Joshua Boyd
> On Sun, 24 Jun 2001, Zach Malone wrote:
> > Hello,
> > Apple does in fact use 64 bit CPUs, all the PowerPC chips from the
> > up are 64bit. The G4 is a 64bit core with a 128bit bus (from what I
> > it may truly be 128bit, but since it is a modified G3 I doubt it).
> > out www.everymac.com, they list specs on every macintosh model back to
> > Mac 128k, and all the PowerPCs are listed as 64bit.
> > Zach
> > ----- Original Message -----
> > From: "Joshua D. Boyd" <jdboyd at cs.millersville.edu>
> > To: <rescue at sunhelp.org>
> > Sent: Monday, June 25, 2001 1:27 PM
> > Subject: Re: [rescue] Another fine business decision for us axp-lovers
> > > Hold up a second. SGI is also heading towards Intel.
> > >
> > > And Apple doesn't really sell 64bit machines (well, they show no signs
> > > making a 64bit OS, and from my understanding, the PPC can be 64bit,
> > > the ones Apple uses aren't). On the bright side, you forgot IBM.
> > > make 64bit PPCs and Power chips. And IBM should be around a long
> > >
> > > --
> > > Joshua Boyd
> > >
> > > On Sun, 24 Jun 2001, Zach Malone wrote:
> > >
> > > > I thought it was funny reading the article on the Register about how
> > Intel
> > > > is thinking about buying Digital from Compaq. So thus far, the list
> > 64
> > > > bit RISC manufacturers which are going to Intel consists of HP, and
> > > > DEC/Compaq. At least we still have Sun, SGI, and Apple, though only
> > and
> > > > Apple seem to produce nice workstations for a reasonable price.
> > Supposedly
> > > > Sun will be releasing UltraSPARC IIIs @ higher clockspeeds soon.
> > >
> > > _______________________________________________
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