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

From: Iggy Drougge <optimus_at_canit.se>
Date: Fri Sep 21 19:07:18 2001

Ethan Dicks skrev:

>--- 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.

There are accelerator boards with 68030+68881 as well.
As for the 68881, it may be run with the 68000 as well. It was used in the
Atari Mega ST series in such a configuration.

>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.

I didn't have any FPU when I was into rendering. Didn't have any MMU either.
Or a hard drive. Fourteen MHz, two MB of chip RAM and a DD floppy drive is all
you need. ^_^

--
En ligne avec Thor 2.6a.
"But software which OpenBSD uses and redistributes must be free to all (be
they people or companies), for any purpose they wish to use it, including
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or atomic bombs to be dropped on Australia."
  - Theo de Raadt
Received on Fri Sep 21 2001 - 19:07:18 BST

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