From the DF Archive: The $64,000 Question

post from Daring Fireball on 10 September 2009 10:01:00 PM. © Daring Fireball

A brief refresher from April 2008 on how Mac OS X got to where it is with regard to support for 64-bit apps:

When Leopard was first announced at WWDC 2006 nine months prior, it included full 64-bit support for both Carbon and Cocoa.

64-bit Carbon wasn?t promised to be coming ?sometime?, like with, say, resolution independence. It was promised for 10.5.0. And it existed ? developer seeds of Leopard up through WWDC 2007 had in-progress 64-bit Carbon libraries, and Adobe engineers were developing against them. Several sources have confirmed to me that Adobe found out that Apple was dropping support for 64-bit Carbon at the same time everyone else outside Apple did: on the first day of WWDC 2007.

If Apple had shipped Leopard with the 64-bit Carbon support promised at WWDC 2006, Photoshop CS4 would run in 64-bit mode on the Mac.

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http://daringfireball.net/2008/04/64000_question