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Mac OS

MacOS El Capitan logomacOS X
Sad Mac errors
System bomb errors
Macintosh startup tones
Shortcut keys
Apple operating system history

macOS X

Mac OS X is the name of Apple's desktop operating system. Its features include:

Aqua GUI — Apple's graphical user interface is a highly-iterated facet of the operating system, designed to be a tactile, intuitive and highly-responsive user experience.
Automator — A system utility for automating tasks in the organizational context of a workflow. Added in version 10.4.
Dashboard — A workspace of configurable widgets including sticky notes, news tickers, weather apps, and a standard and scientific calculator. Widgets are arranged on a customizable workspace overlay which can be toggled with a keystroke. Added in version 10.4.
Mission Control — In OS X, every window is a GL object subjugate to larger operating system GUI. Each window can be viewed in realtime as an icon, and the Mission Control interface allows users to quickly navigate and control running applications across multiple virtual desktops. First introduced in summer of 2003, formerly known as Exposé.
FileVault — Provides control of disk encryption, vital in corporate settings. Added in version 10.3.
Screen Sharing — When enabled, allows remote users to view or control the machine. Compatible with standard VNC clients. Added in version 10.5.
Time Machine — Automated file backup service with chronological revision control and a highly-developed visualized metaphor. When using Time Machine to view the history of your backups, the folders and files scroll forward and backward through time like a circular card file or rolodex. Added in version 10.5.

Sad Mac Errors

If the "happy Macintosh" and the "Welcome to Macintosh" screens appear before the "sad Macintosh", the problem is probably in the system software.

When the "sad Macintosh" face appears immediately at power up, it usually means a hardware problem. Some of the common hardware issues are problems with SIMMs or hard drive.

System bomb errors

1 Bus Error
2 Address Error
3 Illegal Instruction
4 Division by Zero
5 Rage Check Error
6 Overflow
7 Privilege Violation
8 Trace Mode Error
9 Line 1010 Trap
10 Line 1011 Trap
11 Hardware Exception Error
12 Unimplemented Core Routine
13 Uninstalled Interrupt
14 I/O Core
15 Floating Point Error
17 List Manager Not Present
18 Bit Edit Not Present
19 Disk Initialization Package Not Present
20 Standard File Not Present
21 SANE Not Present
22 SANE Transcendental Functions Not Present
23 International Utilities Not Present
24 Binary-Decimal Conversion Package Not Present
25 Out of Memory
26 Bad Program Launch
27 File System Map Trashed
28 Stack Ran into Heap
29 AppleShare Error
30 Disk Insertion Error
31 No Disk Inserted
32-50 Memory Manager Error
41 The Finder Could Not Be Found on the Disk
51 Unserviceable Slot Interrupt
52-53 Memory Manager Error
81 Bad SANE Opcode
84 Menu Purged While in Use
85 Couldn't Load MBDF
86 Couldn't Load Hierarchical Menu's Parent
87 Couldn't Load WDEF
88 Couldn't Load CDEF
90 Floating Point Coprocessor Not Installed