b and c digit selector
1Augmentative and alternative communication — An AAC user indicates a series of numbers on an eye gaze communication board in order to convey a word. Augmentative an …
2Plugboard — This article is about plugboards, or control panels, in unit record machines, cypher machines and early computers. For other uses, see plug board (disambiguation). IBM 402 Accounting Machine control panel[1] wiring. This board was labeled profit… …
3Panel switch — The panel switching system was an early type of automatic telephone exchange, first put into urban service by the Bell System in the 1920s and removed during the 1970s. The Panel and Rotary systems were developed in parallel by Bell Labs before… …
4Director telephone system — The Director System was a system which made it possible to call subscribers at other telephone exchanges without operator intervention in large multi exchange cities, and to have a mixture of automatic and manual exchanges within these cities. It …
5IBM System/360 — The IBM System/360 (S/360) is a mainframe computer system family announced by IBM on April 7, 1964. It was the first family of computers making a clear distinction between architecture and implementation, allowing IBM to release a suite of… …
6Multiplexed display — An entirely typical multiplexed vacuum fluorescent display used in a videocassette recorder Multiplexed displays are electronic displays where the entire display is not driven at one time. Instead, sub units of the display (typically, rows or… …
7postal system — System that allows persons to send letters, parcels, or packages to addressees in the same country or abroad. Postal systems are usually government run and paid for by a combination of user charges and government subsidies. There are early… …
8Tilde — For the baseball player known as the Big Tilde, see Magglio Ordóñez.  ◌̃ Tilde Punctuation …
9UNIVAC II — The UNIVAC II was an improvement to the UNIVAC I that UNIVAC first delivered in 1958. The improvements included core memory of 2000 to 10000 words, UNISERVO II tape drives which could use either the old UNIVAC I metal tapes or the new PET tapes,… …
10Mapping of Unicode characters — Unicode’s Universal Character Set has a potential capacity to support over 1 million characters. Each UCS character is mapped to a code point which is an integer between 0 and 1,114,111 used to represent each character within the internal logic… …
