History
VTAM was introduced 1n 1974 after a series of delays as a major component of SNA, along with the 370x Network Control Program (NCP) and Synchronous Data Link Control (SDLC).
In IBM terminology: VTAM is an access method, software allowing application programs to read and write data to and from external devices. It is called "virtual" because it was introduced at the time that IBM was introducing virtual storage, by upgrading the operating systems of the System/360 series to virtual storage versions. VTAM was supposed to be the successor for older telecommunications access methods Basic telecommunications access method (BTAM) and Telecommunications Access Method (TCAM) (that were maintained for compatibility reasons). As such, VTAM is comparable with VSAM, at the time a new and supposedly converged access method for disk storage.
Read more about this topic: Virtual Telecommunications Access Method
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