Current Mac keyboards include specialized function keys for controlling sound volume. According to the Macintosh Human Interface Guidelines, they are reserved for customization by the user. They have not traditionally been a major part of the Mac user interface, however, and are generally only used on cross-platform programs. Since the introduction of the Apple Extended Keyboard with the Macintosh II, however, keyboards with function keys have been available, though they did not become standard until the mid-1990s. Apple Macintosh: The classic Mac OS supported system extensions known generally as FKEYS which could be installed in the System file and could be accessed with a Command-Shift-(number) keystroke combination (Command-Shift-3 was the screen capture function included with the system, and was installed as an FKEY) however, early Macintosh keyboards did not support numbered function keys in the normal sense.The original IBM PC keyboard (PC/XT, 1981) had 10 function keys (F1–F10) in a 2×5 matrix at the left of the keyboard this was replaced by 12 keys in 3 blocks of 4 at the top of the keyboard in the Model M ('Enhanced', 1984). Later models replaced this with a numeric keypad, and moved the function keys to 24 keys at the top of the keyboard. IBM use of function keys dates to the IBM 3270 line of terminals, specifically the IBM 3277 (1972) with 78-key typewriter keyboard or operator console keyboard version, which both featured 12 programmed function (PF) keys in a 3×4 matrix at the right of the keyboard. Their modern use may have been popularized by IBM keyboards: first the IBM 3270 terminals, then the IBM PC.
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