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.TH VT 1
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.SH NAME
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vt \- emulate a VT-100 or VT-220 terminal
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.SH SYNOPSIS
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.B vt
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[
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.B -2abcx
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]
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[
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.B -f
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.I font
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] [
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.B -l
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.I log
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]
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.SH DESCRIPTION
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.I Vt
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replaces a
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.I rio
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window with a fresh instance of the shell,
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.IR rc (1),
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running within an emulation of a DEC VT-100 terminal.
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To exit
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.IR vt ,
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exit the
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.B rc
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it starts.
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.SS Options
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.TF m
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.TP
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.B 2
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.TP
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.B a
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.TP
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.B x
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change
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.I vt
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to emulate a VT-220, ANSI, or XTerm terminal respectively.
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.TP
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.B b
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changes the color scheme to white text on a black background,
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but potentially with colors from escape sequences.
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.TP
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.B c
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changes the color scheme to monochrome (no colors).
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.TP
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.B f
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sets the
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.IR font .
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.TP
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.B l
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names a
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.I log
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file for the session.
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.SS Menus
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The right button has a menu with the following entries to provide
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the sort of character processing expected by non-Plan 9 systems:
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.TF cooked
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.TP
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.B 24x80
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Resize the
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.I vt
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window to hold 24 rows of 80 columns.
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.TP
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.B crnl
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Print a newline (linefeed) character after receiving a carriage return from the host.
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.TP
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.B cr
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Do not print a newline after carriage return.
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.TP
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.B nlcr
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Print a carriage return after receiving a newline from the host.
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.TP
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.B nl
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Do not print a carriage return after newline.
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.TP
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.B raw
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Enter raw (no echo, no interpretation) character mode for input.
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.TP
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.B cooked
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Leave raw mode.
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.TP
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.B exit
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Exit
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.IR vt .
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.PD
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.PP
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The middle button has a menu with the following entries:
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.TF right_key
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.TP
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.B backup
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Move the display back one screenful.
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.TP
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.B forward
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Move the display forward one screenful.
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(These are a poor substitute for a scroll bar.)
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.TP
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.B reset
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Display the last screenful; the same as going
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.B forward
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to the end.
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.TP
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.B clear
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Clear the screen.  Previous contents can be recovered using
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.BR backup .
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.TP
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.B send
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Send the contents of the
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.B rio
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snarf buffer, just as
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.B send
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in the
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.B rio
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menu.
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.TP
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.B scroll
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Make new lines visible as they appear at the bottom.
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.TP
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.B page
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When the page fills, pause and wait for a character to be typed before proceeding.
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The down arrow key advances a page without sending the character to the host.
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.PD
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.SH SOURCE
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.B /sys/src/cmd/vt
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.SH BUGS
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This program is used only for communicating with foreign systems,
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so it is not
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as rich an emulation as its equivalent in other environments.
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.PP
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Use care in setting raw and newline modes when connecting to Unix systems
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via
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.IR con (1)
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or
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.IR ssh (1).
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It may also be necessary to set the emulator into raw mode.