On 26 Nov 2005 at 0:18, Johannes Gebauer wrote:

> Similarly, 99% of all OS 9 audio software will not work in the classic
> environment.

Well, that seems to me to be an OS limitation.

I will note that when Coda produced its first Win32 version of 
Finale, they had not yet solved the 16-bit thunking problems that 
came with supporting MIDI on both Win95 (which was a mix of Win32 and 
Win16) and WinNT (which was all Win32 with a backward compatibility 
layer for 16-bit programs, but *not* for 16-bit hardware access). So, 
the solution that Coda provides was to install the *16-bit* version 
of Windows on NT. That would be like installing a Classic app on OS X 
because the up-to-date version of the app wouldn't run on OS X.

By the release of WinFin98, Coda had solved the NT Midi problems.

My point is that these kinds of problems are OS-specific, and there 
is no universal rule that the older way *can't* run properly on the 
newer platform. Indeed, with WinFin the old way ran on NT when the 
new way wouldn't.

So, I don't really think the example of OS X and Mac Classic really 
says anything about what would happen to Windows emulation. It would 
all depend on how the VirtualPC session communicates with the 
hardware, either through a direct hardware abstraction layer (perhaps 
the same one used by OS X) or through OS X to its HAL. The latter 
would be like Classic apps, and could have the kinds of problems you 
describe. But I'm not at all certain that's the way it would be 
implemented.

-- 
David W. Fenton                        http://www.bway.net/~dfenton
David Fenton Associates                http://www.bway.net/~dfassoc

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