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270x is a generic name for a family of IBM non-programmable communications controllers used with System/360 and System/370 computers. The family consisted of the following devices: * IBM 2701 Data Adapter Unit * IBM 2702 Transmission Control * IBM 2703 Transmission Control The 2701 and 2702 were announced simultaneously with System/360 in 1964, the 2703 was announced a year later. The 270x series was superseded by the IBM 3704 and 3705 communications controllers in 1972. ==2701== The 2701 supported up to four start-stop or synchronous communications lines. It had two multiplexor channel interfaces for connection to one or two host computers. The synchronous adapter originally supported the ''Synchronous Transmit-Receive (STR)'' protocol, and later ''Binary Synchronous Communications (BISYNC)'' when it was introduced in 1967,〔 in half duplex mode at speeds of up to 40,800 bits per second (bit/s). The 2701 could also have "data acquisition and control adapters" for direct control of external equipment. Initially the 2701 supported the following devices:〔 * IBM 1009 Data Transmission Unit * IBM 1013 Card Transmission Terminal * IBM 7701 Magnetic Tape Transmission Terminal * IBM 7702 Magnetic Tape Transmission Terminal * IBM 7710 Data Communication Unit * IBM 7711 Data Communication Unit * IBM 7740 Communication Control System * IBM 7750 Programmed Transmission Control * Remote System/360 with 2701 * Serial synchronous terminals * IBM 1030 Data Collection System * IBM 1050 Data Communication System * IBM 1060 Data Communication System * IBM 1070 Process Communication System * AT&T 83B2 Type Selective Calling Terminals * Western Union Plan 115A Outstations * Common Carrier TWX Stations * European Teleprinters * Parallel data devices * Contact sense terminals * Contact operate terminals Later the IBM 2740 and IBM 2741 Communication Terminals, and the IBM 2260/2848 were added. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「IBM 270x」の詳細全文を読む スポンサード リンク
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