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) Style="border-width:thin; border-color:#333333; border-Style:daShed; padding:5px;" align="left">In addition Suitable contentS:
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