Hardware and/or software that allows a PC to operate as a terminal and connect to a back-end mainframe or terminal server. Terminal emulators can be designed to emulate specific terminal modes such as ANSI, VT52, VT100, VT220, TN3270, or TN5250. Microsoft HyperTerminal, included with 32-bit Microsoft Windows operating systems, supports a variety of different terminal emulation modes.
The emulation mode on the clients must match the terminal mode running on the back-end system in order for communication to work. If you are trying to connect to an unknown mainframe or other back-end system and your emulator cannot automatically detect the terminal mode needed, try using ANSI mode first. If that fails, try VT100 and other popular terminal modes.