Telnet 3270
TN3270 is the remote-login protocol used by software that emulates the
IBM 3270 model of
mainframe computer terminal. Most standard
telnet clients cannot be used as a substitute for TN3270 clients as they use vastly different protocols and escape sequences; the 3270 terminal also had non-standard keys and keyboard layouts. Instead of
TCP/IP, the original IBM 3270 terminals used the obsolete
SNA protocol.
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