Peripherals for Computer Systems by Alan Bradley (auth.)

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By Alan Bradley (auth.)

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One bit is sometimes used to define a 'protected' mode in which the text can only be altered by the host computer, not by the user at the keyboard; this is useful, for example, to protect headings where the user is entering data into a form. It is because there are these two different ways of using the attribute byte that many word processing programs can underline screen text when working in monochrome, but not on a colour display. Some ergonomic considerations We have already noted that the use of a grey-scale display can give the appearance of increased resolution.

Problems can still arise from the LCD display's sensitivity to heat. Another type of flat panel display is the plasma panel. This uses roughly the same principle as the neon tube; if one electrode in each of two orthogonal sets is energised, a glowing gas discharge takes place where they intersect, and persists until deliberately extinguished. If all the electrodes in one set are energised in turn, while the other set is controlled according to the pixels to be lit, any pattern can be displayed.

We shall take it to mean any keyboard which incorporates a set of keys marked with letters and numbers in a similar layout to the familiar typewriter keyboard. There are usually other keys in addition, bringing the total up to typically 100 or so keys. The keys are grouped in several sections, of which one includes the full set of alphanumeric keys with numbers on the top row, letters on three rows below this in the usual 'QWERTY' arrangement, and a long space bar at the bottom. This block includes keys for punctuation marks, and also a 'shift' key, often duplicated, which gives the alphanumeric keys a double function.

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