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NeXT also included object-oriented programming tools based on the Objective-C language that they had acquired from Stepstone and a collection of Frameworks (or Kits) that were intended to speed software development.

NeXTSTEP originally ran on Motorola s 68k processors, but was later ported to Intel s x86, Hewlett-Packard s PA-RISC and Sun Microsystems SPARC processors.

Later on, the developer tools and frameworks were released, as OpenStep, as a development platform that would run on other operating systems.

Rhapsody built on NeXTSTEP, porting the core system to the PowerPC architecture and adding a redesigned user interface based on the Platinum user interface from Mac OS 8.

An emulation layer called Blue Box allowed Mac OS applications to run within an actual instance of the Mac OS and an integrated Java platform.

The Objective-C developer tools and Frameworks were referred to as the Yellow Box and also made available separately for Microsoft Windows.

The Rhapsody project eventually bore the fruit of all Apples efforts to develop a new generation Mac OS, which finally shipped in the form of Mac OS X Server.

Mac OS X would add another developer API to the existing ones in Rhapsody.

Key APIs from the Macintosh Toolbox would be implemented in Mac OS X to run directly on the BSD layers of the operating system instead of in the emulated Macintosh layer.

Apple also announced that the Yellow Box layer had been renamed Cocoa and began to move away from their commitment to providing the Yellow Box on Windows.

At this WWDC, Apple also showed Mac OS X booting off of a HFS Plus formatted drive for the first time.

Apple Extends Rhapsody Developer Release with Mac OS Compatibility Environment, Code-Named Blue Box.

Archived from the original on 1998-12-02.

WWDC 98 Summary. stepwise.com.

Retrieved 2006-10-13.

Rhapsody Core OS: Intro to the IO Driver Architecture.

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Mac Os X Server Sierra Compatible Adobe