MC68881 vs MC68882 (was Re: Mac Plus as a webserver...)

From: emanuel stiebler <emu_at_ecubics.com>
Date: Wed Sep 19 12:38:38 2001

Ethan Dicks wrote:
>
> --- emanuel stiebler <emu_at_ecubics.com> wrote:
> > Iggy Drougge wrote:
> >
> > > >Yeah, the SE/30 is a 68030, 16MHz; with 68882 FPU...
> > >
> > > Me too, but shouldn't that be a 68881?
> >
> > 68882 is right for 68030 & 68020. 68881 only foir 68020.
> > (talking about hardware, no software)
>
> I _think_ the Amiga 3000/16 had a 16Mhz 68881 and the A3000/25
> had a 25Mhz 68882, but I could easily be mistaken.

That's a while ago ;-)
But as I remember it, if your motherboard provided a different clk for
the FPU,
it could be clocked much higher, reulting in much nice FP performance.
cpu & FPU were working async.
 
> I never did any rendering on my Amigas,
> so my use of the floating point was rather limited.

I did, and it was fun ;-)

> I skipped over
> the '020 when I was heavily into Amigas, leaping from a massively
> expanded A1000 (Rejuvinator, Spirit InBoard, Microbotics Starboard w/Star-
> Drive, ROM switcher, etc.) to an A3000/25.

Never had an Amiga. Probably it is the time now ...

cheers
Received on Wed Sep 19 2001 - 12:38:38 BST