To do this, the 3270 was designed to minimize the amount of data transmitted, and minimize the frequency of interrupts to the mainframe. The main goal of the system was to maximize the number of terminals that could be used on a single mainframe. The 3270 series was designed to connect with mainframe computers, often at a remote location, using the technology then available in the early 1970s. IBM no longer manufactures 3270 terminals, but the IBM 3270 protocol is still commonly used via TN3270 clients, 3270 terminal emulation or web interfaces to access mainframe-based applications, which are sometimes referred to as green screen applications. 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. Due to the text color on the original models, these terminals are informally known as green screen terminals. The 3270 was the successor to the IBM 2260 display terminal. The IBM 3270 is a family of block oriented display and printer computer terminals introduced by IBM in 1971 and normally used to communicate with IBM mainframes. For other uses, see 3270 (disambiguation).
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