Irma board, originally spelled IRMA board, refers to a brand of coaxial interface cards for PC

Personal computer

A personal computer is any general-purpose computer whose size, capabilities, and original sales price make it useful for individuals, and which is intended to be operated directly by an end-user with no intervening computer operator...

s and Macintosh computers used to enable 3270 emulator

3270 emulator

A 3270 Emulator is a computer program that duplicates the functions of an IBM 3270 mainframe computer terminal on a PC or similar microcomputer....

 programs to connect to IBM

IBM

International Business Machines Corporation or IBM is an American multinational technology and consulting corporation headquartered in Armonk, New York, United States. IBM manufactures and sells computer hardware and software, and it offers infrastructure, hosting and consulting services in areas...

 mainframe

Mainframe computer

Mainframes are powerful computers used primarily by corporate and governmental organizations for critical applications, bulk data processing such as census, industry and consumer statistics, enterprise resource planning, and financial transaction processing.The term originally referred to the...

 computers.

IRMA boards were made from 1982 on by Digital Communications Associates, Inc. (DCA) of Alpharetta, Georgia, who in 1994 merged into Attachmate Corporation of Bellevue, Washington.