Basic telecommunications access method information
Basic Telecommunications Access Method (BTAM)[1] is 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BTAM was superseded by VTAM for Systems Network Architecture (SNA) devices.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 continued to be supported in later iterations of the system architecture, and IBM finally withdrew support in 2000.
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.
^IBM System/360 Operating System Basic Telecommunications Access Method Program Logic Manual(PDF). IBM. February 1972. GY30-2001-5.
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