Irma board

Irma board, originally spelled IRMA board, refers to a brand of coaxial interface cards for PCs and Macintosh computers used to enable 3270 emulator programs to connect to IBM mainframe computers.

[1][2] IRMA boards were used to connect PCs and Macs to IBM 3274 terminal controllers.

[3] IRMA boards supported both Control Unit Terminal (CUT) and Distributed Function Terminal (DFT) mode, although the later required additional software–DFT mode supported multiple simultaneous mainframe sessions.

[4] IRMA boards were invented by Technical Analysis Corp. (TAC), acquired by Digital Communications Associates, Inc. (DCA) who manufactured and marketed the Irma products from 1982 on.

DCA[1] of Alpharetta, Georgia, was acquired in 1994 by Attachmate of Bellevue, Washington.