Queued 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

Queued Telecommunications Access Method (QTAM) is an alternative to the simpler Basic Telecommunications Access Method (BTAM) communications access method, introducing built-in queuing. It was developed by IBM as part of DOS/360 and OS/360 and used mainly to transmit batches of data. The OS/360 version of QTAM was not carried over to OS/VS1, SVS or MVS, although its successor, TCAM, was.

References

Other sources

IBM, IBM System/360 Operating System Queued Telecommunications Access Method-Message Processing Program Services, C30-2003.

IBM, IBM System/360 Operating System Queued Telecommunications Access Method-Message Control Program, C30-2005.

IBM, IBM System/360 Disk Operating System--QTAM Message Processing Program Services, C30-5003.

IBM, IBM System/360 Disk Operating System QTAM Message Control Program, C30-5004.