Re: [B2-devel] Mac Classic emulation

[Jonathan K. <jon...@gm...>]

How do I do command-option-X-O from Basilisk II on a sparc?

On 6/15/07, Joshua Juran <jj...@gm...> wrote:
>
> On Jun 15, 2007, at 1:42 AM, Gwenole Beauchesne wrote:
>
> > Le 14 juin 07 =E0 20:50, Joshua Juran a =E9crit :
> >
> >> MOVEC is not supported on the 68000, and when it is supported (e.g.
> >> 68020) it's privileged.
> >
> > Yes, that's what surprised me when I caught those instructions. Oh,
> > BTW, I have just fixed MOVEC emulation for 68020/68030, though we
> > never encountered movec d?,{msp,isp} instructions so far. i.e. that
> > turns out to be only a source cleanup. ;-)
> >
> >> You need the system software to recognize that it's running on a Mac
> >> Classic and limit itself to supported instructions.
> >
> > Actually, I'd expect to reach at least the '?' mark without any
> > specified disk but I don't even get that far. Yes, it's a Classic ROM.
>
> Weird.  Does the ROM code have an exception handler for illegal
> instructions which does something useful, or is it wrongly executing
> MOVEC in the first place?  I'm going to guess the latter, and
> speculate that a branch is misfiring.  Is it possible that the
> emulation incorrectly sets CCR bits, sending us down a 68020 path?
>
> If you can get to the blinking '?', you can hold down Command-Option-
> X-O at boot to startup from the ROM system disk.  :-)
>
> Josh
>
>
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by DB2 Express
> Download DB2 Express C - the FREE version of DB2 express and take
> control of your XML. No limits. Just data. Click to get it now.
> http://sourceforge.net/powerbar/db2/
> _______________________________________________
> basilisk-devel mailing list
> bas...@li...
> https://lists.sourceforge.net/lists/listinfo/basilisk-devel
>



--=20
--
Jonathan Kalbfeld
+1 323 620 6682