Re: [hatari-devel] TT original FPU: 68882 or 68881?

Hi,

For what it's worth, both of the TTs that I've had in my possession have had MC68882s. They were of different revisions, one early (most chips socketed) and one of the last revisions (SMD version).

--Daniel

On Wed, Jan 6, 2021 at 10:51 PM Cyprian Konador <cyprian.konador@xxxxxxxxx> wrote:

Hi All,

I have MC68882FN33A in my TT

śr., 6 sty 2021, 22:38 użytkownik Uwe Seimet <Uwe.Seimet@xxxxxxxxx> napisał:
Hi,

I cannot check this right now, but I'm almost 100% sure my (stock) TT has a
68882.

Best regards

Uwe

> On 6 Jan 2021 at 19:12, Eero Tamminen wrote:
> >
> > I was checking TT HW reference for SCU reg specs, and noticed this:
> >
> > "The TT includes a socketed Motorola MC68881 Floating Point Coprocessor.
> > The MC68881 can be removed and replaced with the hardware compatible
> > MC68882. There is a slight software difference in the size of the
> > exception stack frames, but it is possible to write software that will
> > run transparently with either part."
> >
> > Hatari configures TT with 68882, but maybe we
> > should actually use 68881, if TT machines were
> > shipped with that...?
> >
> The Field Service Manual that I have specifies an MC68881. However, my copy of
> "Current Notes" (December 1990) reprints Atari news releases at COMDEX that
> year, and they say that the TT has a 68882.
>
> Would you like me to check what my TTs are equipped with?
>
> Roger
>
>
>