VT220/VT320 Function Keys

The VT220 and VT320 emulations in TinyTERM each come in two different modes: eight-bit and seven-bit. The seven-bit modes are set off by "-7" at the end of the name; e.g., VT220-7.

Function Keys

This has the most effect on the strings sent by the function keys. The initial sequence for each depends on whether the terminal mode is 7- or 8-bit. Key sequences in 7-bit mode are documented here.

In 8-bit mode, the sequence \E[ (escape, left square bracket) is replaced by the CSI code, hex value 9B. \EO (escape, capital O) is replaced by the SS3 code, 8F. And \ED (escape, capital D) is replaced by the IND code, hex 84.

Systems that require 7-bit VT emulations will not respond to the 8-bit key sequences. But systems that use 8-bit emulations will also respond to the 7-bit sequences.

Telnet Terminal Type

The -7 identifier is carried through as part of the telnet terminal type sent to the host when connecting via TCP/IP (rlogin, telnet or SSH connections). Not all host systems recognize those terminal names. When that happens, on the Session tab of Session Properties enter the shorter name for the terminal type, all in lower case. For VT220-7 emulation, enter vt220. For VT320-7, enter vt320.

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