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m (1) linkify Mercer Island, WA; (2) use "Washigton" instead of "WA" [to me, WA means Western Australia] |
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[[Image:ATMscreen.jpg|thumb|right|300px|ATM in [[Mercer Island,
'''Screen Labeled Function Keys''' are a special case of [[function keys]] are keys which are placed in close proximity to screen labels. These are most commonly found in kiosk applications such as [[automated teller machine]]s and [[gas pump]]s. These were first developed by [[Hewlett-Packard]] in the 1970s. The [[HP 9830]] desktop computer was the first calculator with two rows of 4 keys over which a paper overlay would be placed. These were adapted to terminals. Users would, of course, lose these labels. Programmers found that the [[HP 2640]] terminals could lock the top two lines of the screen, so they displayed the key functions there. Starting with [[HP 2647]] terminal, the keys were re-arranged to correspond with 2 pairs of 4 labels at the bottom of the screen. These could be programmed by [[escape sequence]] or [[configuration screen]]. This would be further developed on the failed [[HP 300]] Amigo, which used keys at the right side of the screen and [[HP 250]] business computers which placed them at the bottom. By arranging functions in hierarchical trees, many functions can be implemented with only 8 keys.
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