Telnet 3270
From Wikipedia, the free encyclopedia.
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.
