OS4 Classic, why disable the 68k ?

[Erebos]

Hi,
I just wondering why the onboard 68k is disable on the Classic version of OS4 ?
If it wasn't, would it be possible to run things without 'runinuae' or the likes ? or maybe it will speed up this as it wont need to emulate the 68k ?

[Erebos]

indeed, very interesting answers here.
So it is because of hardware design that OS4 is doing that way..
But if WarpOS+ 3.x managed to do that it must be feasible ;-)

[Erebos]

@cgutjahr
as i was talking about classic version, I cant see how the PPC side of my blizard ppc at 240mhz can be faster emulating 68k than my real 060 onboard...
Plus i'd say that performances do not drop at all when on 3.9 i have 68k tasks running along side ppc ones (like wos mp3 decoding)
Reason maybe is that it is much easier to maintain an unique branch of the OS that is primary towarded to NG amigas and not designed for classic at first.
maybe that contexts switches are too heavy to handle, but...i'm skeptical

Anyway please do not misunderstand my words, i'm glad that OS4 exists for classic and thanks Hyperion for it ;-)

[Erebos]

@Karlos
Seriously when I asked for this , I didn't expect this thread to slip that way, and that is very interesting. your views on the possibility to use the 68k to do something instead of just being there in the cold is great, even if technical explanation is a little over my capabilities i have to admit, anyway thanks. That is Amiga hacking spirit :-)

@all
Do you know some software bench i can use under OS4 classic to compare the performance of a 060 to an emulated 68k with Petunia  ?

@cgutjahr
I bought OS4.0 at launch date but haven't been happy with software compability back in the day and the fact that games (mostly whdload'ed) under runinuae were unplayable with the configuration i had at the time, and so I switched back to 3.9 but maybe I would have to try the 4.1 classic version or... 4.2 XD

[Erebos]

@JJ
Nope, you just can't run whdload on OS4 without UAE (runinuae).
Some are saying that it needs a rewrite for hardbanging but no skilled coder(s) took the challenge up till now (snif...)