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On Mon, Jan 14, 2002 at 02:04:50PM -0800, David A. Gatwood wrote:
> Well, the difference between mac68k and macppc is kind of obvious, but the
> differences between a nubus ppc and a PCI ppc are pretty small by
> comparison.  Other than a little bit of tweaking at the kernel entry
> point, the only huge issue is the lack of OF.

Hrm.

I'm not sure I agree. I think a PDM (which stands for Piltdown Man,
for those following along at home; as in, the missing link... they
were thinking between 68k macs and Taligent's Tesserect, but it's
ironically appropriate now) is closer to the 68k line than to the
later PCI PowerPC line in many respects. Am I mistaken?

> That's an awful lot of work for two systems as similar as the nubus and
> pci PowerMacs....

Are they really so similar? The *processor* is, sure, but isn't most
of the motherboard hardware fairly different? (I'm not talking about
SCSI or even the swim3 here, but RAM, expansion ports, video
hardware... yes, I know that we don't care, you don't think we
should deal with it yet, and we can hijack it from Mac OS, so those
aren't the best examples, but...)

> 7.  601 support

Well, I lack any PDM (I typically type x100, but this works just
as well) PowerMacs, but I do seem to have a 601 with a PCI bus
handy. So maybe I'll play with that, eh? :^>

Actually, come to think of it, I think there's a Centris 610 with a
PowerMac 6100 motherboard in it taking up space in my father's
office in St. Louis. If someone wants to play and lacks access to a
PDM, I'll see if I can persuade him to part with it. I think it's
a little over my head, though.

> #7-8 can be ignored as long as you have a Newer accelerator card
> and are using Apple-supplied video (i.e. not a nubus card).

Sure, but #7 buys us 7200 (and 7400? Is that the right model
number?) support and gives support for PDMs another leg to stand on.

> The old 601 processor reference from Motorola, 'cept that it's out of
> print.  You can probably find a copy used somewhere or borrow one from
> someone.  If I had a copy, I'd loan it to you.

You mean like this:

  http://www.mot.com/pub/SPS/PowerPC/library/user_man/601UM.pdf

=2E.. which I found by way of:

  http://www.macbsd.com/openmac/refs.html#powerpc

(Thanks Allen!)

[Lose old PPCs or lose old OF?]
> My guess is... both?  ;-)

My guess is force-feed marketing of newer systems, actually. Apple's
making more money from hardware than software, last I heard.

--=20
gabriel rosenkoetter
gr@eclipsed.net

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