Information: - A 3270 Emulator is a terminal emulator that duplicates the functions of an IBM 3270 mainframe computer terminal on a PC or similar microcomputer. - A microcomputer is a small, relatively inexpensive computer with a microprocessor as its central processing unit (CPU). It includes a microprocessor, memory, and minimal input/output (I/O) circuitry mounted on a single printed circuit board. Microcomputers became popular in the 1970s and 1980s with the advent of increasingly powerful microprocessors. The predecessors to these computers, mainframes and minicomputers, were comparatively much larger and more expensive (though indeed present-day mainframes such as the IBM System z machines use one or more custom microprocessors as their CPUs). Many microcomputers (when equipped with a keyboard and screen for input and output) are also personal computers (in the generic sense). - 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 . 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 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 . - The IBM 3270 is a class of block oriented computer terminal (sometimes called "display devices") introduced by IBM in 1971 normally used to communicate with IBM mainframes. The 3270 was the successor to the IBM 2260 display terminal. Due to the text colour on the original models, these terminals are informally known as "green screen" terminals. Unlike a character-oriented terminal, the 3270 minimizes the number of I/O interrupts required by transferring large blocks of data known as data streams, and uses a high speed proprietary communications interface, using coaxial cable. - A terminal emulator, terminal application, term, or tty for short, is a program that emulates a video terminal within some other display architecture. Though typically synonymous with a shell or text terminal, the term "terminal" covers all remote terminals, including graphical interfaces. A terminal emulator inside a graphical user interface is often called a terminal window. - Mainframe computers (colloquially referred to as "big iron") are computers used primarily by large organizations for critical applications, bulk data processing, such as census, industry and consumer statistics, enterprise resource planning, and transaction processing. After reading the paragraphs above, we are interested in knowing the entity with which 'irma board' exhibits the relationship of 'instance of'. Find the answer from the choices below. Choices: - application - architecture - central processing unit - class - computer terminal - data - day - emulator - enterprise - graphical user interface - industry - interface - mainframe computer - microcomputer - printed circuit board - sense - system - term - terminal emulator - video - window
The answer to this question is:
printed circuit board