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Basic telecommunications access method : ウィキペディア英語版
Basic telecommunications access method
Basic Telecommunications Access Method (BTAM)〔http://www.bitsavers.org/pdf/ibm/360/os/btam/GY30-2001-5_BTAM_Program_Logic_Rel_21_Feb72.pdf〕 was a low-level programming interface specified by IBM for use on the IBM System/360 for start-stop and binary synchronous telecommunications terminals. Later, IBM specified higher-level interfaces QTAM and TCAM.
BTAM was superseded by VTAM for Systems Network Architecture (SNA) devices.
BTAM requires the application program or transaction processing system to handle almost every detail of the protocol. This is harder than using a higher-layer protocol, but it permits interfacing to non-standard devices in non-standard ways. BTAM continued to be supported in later iterations of the system architecture. IBM finally withdrew support for BTAM in 2000.
==An access method for terminals==
BTAM was an access method for interactively communicating with remote terminals, usually connected through a front end processor such as a 270x, although support for local 3270 terminals was included. BTAM dynamically built CCW's for reading, writing and "polling" terminals and dealt with specific responses from those terminals, according to the success or failure of the communication channel.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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