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A History of Apple's Operating Systems

Introduction

Mac OS X is a unique operating system in that it represents a rather successful coming together of paradigms, ideologies, and technologies that have usually resisted each other in the past. It is a result of the trials and tribulations of Apple and NeXT, as well as their user and developer communities. Mac OS X is perhaps one of the best examples of how a capable system can result through the direct or indirect efforts of corporations, academic and research communities, the Open Source and Free Software movements, and even individuals.

Apple has been around since 1976, and many accounts of its history have been told. If the story of Apple as a company is fascinating, so is the "technical" story of Apple's operating systems.

This document discusses operating systems that Apple has created in the past, and many that it tried to create. Through this discussion, we will come across several technologies the confluence of which eventually led to Mac OS X. An important goal of the discussion is to better understand the reasons, and if possible, the rationale behind Mac OS X and its important components. This, in turn, will be helpful in understanding and appreciating the system as it is today.

My approach in this discussion is to have somewhat high magnitudes of the depth and breadth of historical coverage, as long as I believe the discussion is interesting and relevant from a system design perspective, within reason. For example, while I will briefly describe "the influence of Xerox PARC" and the background of Mach, I will not go to farcical limits and talk about the invention of the transistor, or the discovery of Silicon.

Feedback
I will welcome, and do request constructive feedback. I will highly appreciate if any errors, omissions, or misrepresentations are pointed out to me.

I thank all those who have taken time to send me feedback in the past, and apologize to those whom I did not, rather could not, reply to individually.

Contents

First Bytes into an Apple

Early Apple Systems
Apple DOS
Apple Pascal
Apple CP/M
Apple SOS
Apple ProDOS

Inspirations

The oNLine System
Smalltalk
Xerox Alto
Xerox STAR System

The Graphical Age at Apple

Lisa OS
Macintosh

Many Systems for Many Apples

System Software Releases 2 - 6
Blue, Pink, and Red
GS/OS
A/UX

Seeking Power

System 7
AIM for POWER
Mac OS for PowerPC
NetWare for PowerPC
AIX for PowerPC

Quest for the Operating System

Star Trek
Raptor
NuKernel
Taligent and TalOS
Copland
Gershwin
BeOS
Plan A

The NeXT Chapter

NEXTSTEP
OPENSTEP
What NeXT? The Mach Factor
Rochester's Intelligent Gateway
Accent
Mach
MkLinux
Musical Names

Strategies

Mac OS 8
Mac OS 9
Rhapsody
Blue Box
Yellow Box

Towards Mac OS X

Mac OS X Server
Darwin
Mac OS X Developer Previews
Mac OS X Public Beta
Mac OS X 10.x

Others

Mac OS on Pippin
Newton OS
iPod's OS

         

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