The IBM 3270 is a class of
terminals made by
IBM since 1972 (known as "Display Devices") normally used to communicate with
IBM mainframes. As such, it was the successor to the IBM 2260 display terminal. Due to the text color on the original models, these terminals are informally known as
green screen terminals. Unlike common serial ASCII terminals, the 3270 minimizes the number of
I/O interrupts required by accepting large blocks of
data known as
datastreams, and uses a high speed proprietary communications interface, using coax cable.
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A program, similar to
telnet, used to connect to remote
IBM mainframe hosts, many of which do not understand telnet. The program emulates a
3270-type terminal.
For many tn3270 versions, the "clear screen" function is activated by typing Control-Z. When logged on to an IBM host and "HOLDING" or "MORE..." appears at the lower right corner of the screen, the "clear screen" function must be entered to display the next screen. tn3270 emulations usually include
function key definitions.
(1994-11-03)
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