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This example shows that three keys, brown, blue and green, have been pressed. A signal path is accurately detected from terminal 1, through the brown switch to terminal 6, indicating that key 1/6 has been pressed. However, the signal also routes through the blue and green switches to terminal 4, falsely indicating that key 1/4 has been pressed.
With Num Lock on, digit keys produce the corresponding digit. On Apple Macintosh computers, which lack a Num Lock key, the numeric keypad always produces only numbers; the Num Lock key is replaced by the Clear key. The arrangement of digits on numeric keypads with the 7-8-9 keys two rows above the 1-2-3 keys is derived from calculators and cash ...
A common test for whether the computer has crashed is pressing the "caps lock" key. The keyboard sends the key code to the keyboard driver running in the main computer; if the main computer is operating, it commands the light to turn on. All the other indicator lights work in a similar way.
This did not work for characters not in the Windows Code Page (such as box-drawing characters). The new Alt+0### combination (which prefixes a zero to each Alt code), produces characters from the newer "Windows code pages." [a] For example, Alt+ 0 1 6 3 yields the character £ (symbol for the pound sterling) which is at 163 in CP1252. [2] [b]
Num Lock or Number Lock (⇭) is a key on the numeric keypad of most computer keyboards. It is a lock key , like Caps Lock and Scroll Lock . Its state affects the function of the numeric keypad commonly located to the right of the main keyboard and is commonly displayed by an LED built into the keyboard.
The first key-activated mechanical calculators and many cash registers used "parallel" keys with one column of 0 to 9 for each position the machine could use. A smaller, 10-key input first started on the Standard Adding Machine in 1901. [9] The calculator had the digit keys arranged in one row, with zero on the left, and 9 on the right.
In computer programming, an input kludge is a type of failure in software (an anti-pattern) where simple user input is not handled.For example, if a computer program accepts free text input from the user, an ad hoc algorithm will mishandle many combinations of legal and illegal input strings.
A kludge is often used to modify a working system while avoiding fundamental changes, or to ensure backwards compatibility. Hack can also be used with a positive connotation, for a quick solution to a frustrating problem. [12] [13] A kludge is often used to fix an unanticipated problem in an earlier kludge; this is essentially a kind of cruft.