The original operating system for the Apple [http://www.apple.com/] Macintosh Computer
(which was not the first computer from Apple - it was actually a fourth or more generation computer).  Also called [MacOS Classic] to differentiate from [MacOS X].

These days, most Macs are coming with [MacOS X] installed.

Note however that [Daniel Steffen] and others continue to provide
[Tcl], [Tk], and even [Tclkit] in formats suitable for [MacOS Classic] (both 68k and Power PC!).
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''[DKF] vaguely remembers the Apple ]][[, which is kind-of awkward to type in the Wiki...'' 
[LV] has several models of these still - though that is likely to change in the upcoming weeks.

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See [QuickTimeTcl] as one of the Mac specific extensions.
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[Category Operating System]