![]() Like the Commodore 128, this also had a Help key. ![]() Commodore Amiga: ten keys arranged in a row of two five-key groups across the top of the keyboard (flush with the ordinary keyboard top row) function keys are 1½ times the width of ordinary keys.Commodore 128: essentially same as VIC-20/C64, but with (grey) function keys placed in a horizontal row above the numeric keypad right of the main QWERTY-keyboard also had Help key.Commodore VIC-20 and C64: F1/F2 to F7/F8 in a vertical row of four keys ascending downwards on the computer/keyboard's right hand side, odd-numbered functions accessed unshifted, even-numbered shifted orange, beige/brown, or grey key color, depending on VIC/64 model/revision.Coleco Adam: six dark brown keys in a horizontal row above the number keys, labeled with Roman numerals I–VI.The case included a transparent plastic strip above them to hold a function key reference card. The break, arrow, and copy keys could function as F10–F15. BBC Micro: red/orange keys F 0 to F 9 in a horizontal row above the number keys on top of the computer/keyboard.Atari ST: ten parallelogram-shaped keys in a horizontal row across the top of the keyboard, inset into the keyboard frame instead of popping up like normal keys.Atari 1200XL had four additional keys labeled F1 through F4 with pre-defined actions, mainly related to cursor movement. Atari 8-bit family (400/800/XL/XE): four dedicated keys (Reset, Option, Select, Start) at the right hand side or on the top of the keyboard the XL models also had a Help key.Apricot PC/Xi: six unlabelled keys, each with an LED beside it which illuminates when the key can be used above the keys is a liquid crystal display-the 'microscreen'-that is used by programs to display the action performed by the key.For the most part, Mac laptops have keys F1 through F12, with pre-defined actions for some, including controlling sound volume and screen brightness. Apple Macintoshnotebooks: Function keys were not standard on Apple notebook hardware until the introduction of the PowerBook 5300 and the PowerBook 190. ![]() Former keyboards and Apple Keyboard with numeric keypad has the F1–F19 keys. The most recent Mac keyboards include 19 function keys, but keys F1–F4 and F7–F12 by default control features such as volume, media control, and Exposé. 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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