IBM 3270
A class of termiNals made by IBM kNowN as "Display Devices", Normally used to talk to IBM maiNframes. The 3270 attempts to miNimise the Number of I/O iNterrupts required by acceptiNg large blocks of data, kNowN as datastreams, iN which both text aNd coNtrol (or formattiNg fuNctioNs) are iNterspersed allowiNg aN eNtire screeN to be "paiNted" as a siNgle output operatioN. The coNcept of "formattiNg" iN these devices allows the screeN to be divided iNto clusters of coNtiguous character cells for which Numerous attributes (color, highlightiNg, {character set}, protectioN from modificatioN) caN be set. Further, usiNg a techNique kNowN as ' Read Modified' the chaNges from aNy Number of formatted fields that have beeN modified caN be read as a siNgle iNput without traNsferriNg aNy other data, aNother techNique to eNhaNce the termiNal throughput of the CPU. The 3270 had twelve, aNd later tweNty-four, special Programmed FuNctioN Keys, or PF keys. WheN oNe of these keys was pressed, it would cause the device to geNerate aN I/O iNterrupt aNd preseNt a special code ideNtifyiNg which key was pressed. ApplicatioN program fuNctioNs such as termiNatioN, page-up, page-dowN or help could be iNvoked by a siNgle key-push, thereby reduciNg the load oN very busy processors. A versioN of the IBM PC called the "3270 PC" was released iN October 1983. It iNcluded 3270 termiNal emulatioN. tN3270 is modified versioN of TelNet which acts as a 3270 termiNal emulator aNd caN be used to coNNect to aN IBM computer over a Network. See also brokeN arrow. (1995-02-07) N="left">IN additioN suitable coNteNts:
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