IBM 37xx

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IBM 37xx series

IBM 3725 controller
Manufacturer	IBM
Release date	1972; 52 years ago (1972)
Discontinued	2002
Predecessor	IBM 270x series
Successor	Communications Controller for Linux software

IBM 37xx (or 37x5) is a family of IBM Systems Network Architecture (SNA) programmable communications controllers used mainly in mainframe environments.

All members of the family ran one of three IBM-supplied programs.

• Emulation Program (EP) mimicked the operation of the older IBM 270x non-programmable controllers.
• Network Control Program (NCP) supported Systems Network Architecture devices.
• Partitioned Emulation Program (PEP) combined the functions of the two.