![]() ![]() Amazingly, with only 16MB of memory, an IBM 3033 mainframe from the 1970s could support up to 17,500 3270 terminals under a single CICS application!Įach of the 3270 terminals were communicating with the mainframe using the “3270 data stream” language. Typically, the organization would then utilize 3270 terminals to connect with the mainframe.Įarly on, an IBM 3270 mainframe terminal consisted of only a few components: a big CRT (Cathode Ray Tube) monitor, a keyboard, and a coaxial cable which connected the terminal to the mainframe by way of a control unit. Indeed, in the ‘70s and ‘80s, most large companies throughout the world were using an IBM mainframe computer, often running CICS or some other competing software application. Because of it was a non-programmable workstation, the 3270 was often called a “dumb” workstation.Ĭompanies adopted 3270 terminals in large numbers. This was happening over the limited bandwidth networks at that time. Consisting of a screen and a keyboard, the 3270 was a non-programmable terminal and was meant to be used in conjunction with a centralized mainframe. The original IBM 3270 mainframe terminal was released in 1971 to replace its predecessor, the IBM 2260. In this post, we will try to provide some relevant information that will help everyone better understand 3270 and the related terms. Everyone knows what 3270 means, right? Sure, within the mainframe community, 3270 is a common term, but what about those non-mainframers out there? 3270 is used to describe quite of lot of things related to accessing the mainframe: 3270 terminals, 3270 applications, 3270 protocols, and TN3270 emulators. ![]()
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