Re: [hatari-devel] Microwire register value on Falcon

[Laurent Sallafranque <laurent.sallafranque@xxxxxxx>]

Another thought,

Thomas, would it be possible to modifiy your bus error program to test :
1) is this address is a buss error one ?
2) if not, try to write a value into the address, then read it 2 or 3 
times with some time between and repeat the write/read with a few 
different values ?

Like this, on the real Falcon, we could detect if some other addresses 
behave like the microwire one.

Regards

Laurent



Le 01/02/2012 23:52, Laurent Sallafranque a écrit :
> Hi,
>
> Thanks a lot too for the tests.
>
> So, it seems that $ff8922 always return 0 and $ff8924 returns $7ff 
> except the first time (a change, then the mask value).
>
> I think it could be OK to just return $7ff, but a program may test if 
> the value is different and then equal.
> As I've never encountered this before, I think we can just return $7ff 
> and add a comment in iomemtabfalcon for this $f800 value, for later if 
> needed.
>
> Thomas, instead of a return0 function, wouldn't it be better to have a 
> returnFixValue (thevalue) one ?
>
> we could do : returnFixValue(0) for $ff8922 and returnFixValue($7ff) 
> for $ff8924
>
> Regards
>
> Laurent
>
>
>
>
>
> 01/02/2012 22:09, Thomas Huth a écrit :
> > Am Wed, 1 Feb 2012 20:45:06 +0000
> > schrieb "Konador, Cyprian"<cyprian.konador@xxxxxx>:
> > [...]
> > > Below you can find result in TXT
> > >
> > > CPU - Microwire Data read:
> > > pass 1    pass 2    pass 3    pass 4
> > > $0000    $0000    $0000    $0000
> > > $0000    $0000    $0000    $0000
> > > $0000    $0000    $0000    $0000
> > > $0000    $0000    $0000    $0000
> > > [...]
> > >
> > > CPU - Microwire Mask read:
> > > pass 1    pass 2    pass 3    pass 4
> > > $f800    $f800    $f800    $f800
> > > $07ff    $07ff    $07ff    $07ff
> > > $07ff    $07ff    $07ff    $07ff
> > > $07ff    $07ff    $07ff    $07ff
> > > [...]
> > Ok, thanks a lot to everybody involved for the fast help here! I'm not
> > quite sure how to interpret the $f800 in the mask register here
> > (anybody got an idea why the Falcon would return the inverted value
> > here?), but I think for the most programs, it should be enough to simply
> > return the value that has been written to the register. What do you
> > think?
> >
> >   Thomas