Macintosh operating systems

macOS (previously OS X and originally Mac OS X) is a proprietary Unix operating system, derived from OPENSTEP for Mach and FreeBSD, which has been marketed and developed by Apple since 2001. It is the current operating system for Apple's line of Mac computers. Within the market of desktop and laptop computers, it is currently the second most widely used desktop OS, after Microsoft Windows and ahead of all Linux distributions, including ChromeOS and SteamOS. , the most recent release of macOS is macOS 26 Tahoe, the 22nd major version of macOS.

operating system for Apple Mac

Apple Macintosh’s original operating system (1984–2002)

Macintosh file manager and GUI shell

Apple file system for macOS

Linux distribution for Apple Silicon based Macintosh computers

A/UX is a Unix-based operating system from Apple Computer for Macintosh computers, integrated with System 7's graphical interface and application compatibility. It is Apple's first official Unix-based operating system, launched in 1988 and discontinued in 1995 with version 3.1.1. A/UX requires select 68k-based Macintosh models with an FPU and a paged memory management unit (PMMU).

file system developed by Apple

operating system

A FourCC ("four-character code") is a sequence of four bytes (typically ASCII) used to uniquely identify data formats. It originated from the OSType or ResType metadata system used in classic Mac OS and was adopted for the Amiga/Electronic Arts Interchange File Format and derivatives. The idea was later reused to identify compressed data types in QuickTime and DirectShow.

PICT is a graphics file format introduced on the original Apple Macintosh computer as its standard metafile format. It allows the interchange of graphics (both bitmapped and vector), and some limited text support, between Mac applications, and was the native graphics format of QuickDraw.

notetaking application for Apple Macintosh computers

file system

monospaced typeface

macOS application

Macintosh models that use a Macintosh Toolbox read-only memory chip

Macintosh models that do not use a Macintosh Toolbox ROM on the logic board

fork of a file on HFS/HFS+/APFS used to store structured data along with the unstructured data stored within the data fork