Irma board

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DCA Irma board for PCs (IRMA II ISA)

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]

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 Corporation of Bellevue, Washington.

A board with all the capabilities of that which would eventually be called IRMA was originally developed in-house by Amdahl Corp in 1977, but it was not actively marketed by Amdahl.

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