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

From: Ethan Dicks <erd_6502_at_yahoo.com>
Date: Wed Sep 19 11:44:20 2001

--- 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.

My memory is that the parts were interchangable in hardware (presuming
the speed was OK) but the performance was better at a given speed
for the 68882 over the 68881. I never did any rendering on my Amigas,
so my use of the floating point was rather limited. 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.

-ethan


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Received on Wed Sep 19 2001 - 11:44:20 BST

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