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What language is OS 9 written in?

Hello,

Out of nostalgic reasons I would like to know what programming language is Mac OS 9 written in? Some people on here mentioned C, C++ or all assembly language. Given that the classic Mac OS goes back to the early 1980s(1984), can someone say that Mac OS 9 was or is written in all C,C++ or Assembly language?

Power Macintosh G4 MDD 1.25DP System w/ 2MB L3 Cache/2GB PC2600U, Mac OS X (10.4.11), Apple 4.7GB DVD-RAM Drive/BenQ 16x Superdrive/Plextor 16x Superdrive

Posted on Jul 14, 2008 8:25 AM

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18 replies

Jul 28, 2008 2:49 PM in response to Simon Teale

It's not the OS, but Google Earth is must-have functionality for me that I can't get while running OS 9. Of course now I can't get it in Panther either, and that will be what drives me to upgrade to Tiger.

I waited three years after OS X was introduced to use it. I just couldn't bear the idea that after 20 years of using Macs, I'd have no clue how to solve problems in OS X. Nor could I imagine what a non-issue that would turn out to be when I finally dipped my toe in (at Jaguar, soon upgraded to Panther).

Jul 29, 2008 2:01 AM in response to eww

Bah, Google Earth, of course. Maybe one of the reasons I bought an iPod Touch, just so I wouldn't have to switch from Panther to Tiger on my MDD.
I had thought that the images available in Google Earth were available under Panther with Google Maps (had the Google Maps car outside my house yesterday for 20 minutes taking street pictures, hopefully all my playing about outside with my 19-month son will bring fame, even if they fuzz my face).
Likewise, my 20+ years of Unix is largely unrequired looking after Mac OSX, although it does help with programming projects.

What language is OS 9 written in?

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