Telecommunications Access Method

OS/360 I/O access methods

Low-level	EXCP · EXCPVR · STARTIO

Storage	XDAP · BDAM · BSAM · QSAM · BPAM ISAM · VSAM · OAM

Network	BTAM · QTAM · TCAM · VTAM

Telecommunications Access Method (TCAM) is an access method, in IBM's OS/360 and successors computer operating systems on IBM System/360 and later, that provides access to terminals units within a teleprocessing network.^[1]

TCAM provided essentially the same functionality as QTAM, and in addition was the access method for the initial version of Time Sharing Option (TSO). It initially supported

Binary Synchronous Communications (BSC) terminals
start/stop terminals
2260 terminals
message queuing in storage and on disk

Support for 3270 terminals was soon added.

References

^ Burnie Blakeley, Harry Harris, and Rhys Lewis (1995). Messaging and Queuing Using the Mqi: Concepts & Analysis, Design & Development. McGraw-Hill. pp. 9. ISBN 0070057303.