On Monday, November 25, 2002, at 02:25 PM, Dan Knight wrote:
> In that respect, it's like running a DOS session in Windows. The
> primary
> OS does intercept some calls and handle a lot of interface issues with
> hardware, but you are running the full classic Mac OS inside OS X.
That is probably the closest one can come to a comparison.
One of the cool things about the mach "microkernal" in Mac OS X is
that it works as a hardware abstraction layer. That means that the
only piece of software that has to know how to talk directly to the
hardware is mach (including its extensions). The rest of Mac OS X
treats mach as the actual hardware. Classic is Mac OS X that thinks
mach is the hardware. There really is very little translation
necessary and virtually no slowdown. Much of the slowdown using
Classic is not from running Mac OS 9 as a virtual machine, but from
running the rest of Mac OS X. The rest is in the fact that mach
doesn't expose the video acceleration (fully) to Classic. There are
even speedups in Classic because mach speaks to a PowerPC native file
system while original Mac OS does not. File access is faster in
Classic (usually).
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