|Re: [hatari-devel] Hatari FPU support|
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Le 06/12/2020 à 21:42, Eero Tamminen a écrit :
On 12/5/20 6:11 PM, Jerome Vernet wrote:
Wich CPU/FPU combination are usable ?
Even thru the SDL GUI, I can select 68000/6882, Hatari ask to restart,
but no FPU is shown..
There is now way to have a 6882 with a 68000 ?
Hatari manual "The CPU Dialog" section says:
"The FPU settings are also only available with
the "WinUAE" builds of Hatari. They can be used
to select the type of floating point unit of CPUs
Looking back to old discussions on 68000 FPU
support, they apparently work very differently
and would be hard to emulate & undocumented.
Nicolas, I think FPU should be listed in Hatari
manual HW matrix, but I'm not sure what notes
I should add for each machine type. Any suggestions?
FPU line could be added to the matrix. 68881/82 can be used with
68020/030. With 68040/60, FPU is included in the cpu (but as these cpu
were not natively used in atari's machine, it's not an issue for the HW
As christian wrote, 68000/10 can't use the 68881/82 directly ; note that
Winuae's cpu core has a hack mode to use the FPU with 68000/10 anyway,
but we don't use it in Hatari for now.
So, in the end, I think that FPU emulation should be marked as available
i the matrix only for TT/Falcon (ie 68030 CPU). Other machines are using
a 68000, so it should not be considered as possible (at least for Hatari
at the moment, even if some HW modifications could be made, as described
SDL, macOS & Python GUI should probably also note
that FPU selection is 020+ specific.
(And I guess I should move FPU accuracy note from
Features section to CPU dialog section.)