path: root/runtime/doc/term.txt

*term.txt*      For Vim version 7.0aa.  Last change: 2005 Jun 06


		  VIM REFERENCE MANUAL    by Bram Moolenaar


Terminal information					*terminal-info*

Vim uses information about the terminal you are using to fill the screen and
recognize what keys you hit.  If this information is not correct, the screen
may be messed up or keys may not be recognized.  The actions which have to be
performed on the screen are accomplished by outputting a string of
characters.  Special keys produce a string of characters.  These strings are
stored in the terminal options, see |terminal-options|.

NOTE: Most of this is not used when running the |GUI|.

1. Startup			|startup-terminal|
2. Terminal options		|terminal-options|
3. Window size			|window-size|
4. Slow and fast terminals	|slow-fast-terminal|
5. Using the mouse		|mouse-using|

==============================================================================
1. Startup						*startup-terminal*

When Vim is started a default terminal type is assumed.  For the Amiga this is
a standard CLI window, for MS-DOS the pc terminal, for Unix an ansi terminal.
A few other terminal types are always available, see below |builtin-terms|.

You can give the terminal name with the '-T' Vim argument.  If it is not given
Vim will try to get the name from the TERM environment variable.

				*termcap* *terminfo* *E557* *E558* *E559*
On Unix the terminfo database or termcap file is used.  This is referred to as
"termcap" in all the documentation.  At compile time, when running configure,
the choice whether to use terminfo or termcap is done automatically.  When
running Vim the output of ":version" will show |+terminfo| if terminfo is
used.  Also see |xterm-screens|.

On non-Unix systems a termcap is only available if Vim was compiled with
TERMCAP defined.

					*builtin-terms* *builtin_terms*
Which builtin terminals are available depends on a few defines in feature.h,
which need to be set at compile time:
    define		output of ":version"	terminals builtin	~
NO_BUILTIN_TCAPS	-builtin_terms		none
SOME_BUILTIN_TCAPS	+builtin_terms		most common ones (default)
ALL_BUILTIN_TCAPS	++builtin_terms		all available

You can see a list of available builtin terminals with ":set term=xxx" (when
not running the GUI).  Also see |+builtin_terms|.

If the termcap code is included Vim will try to get the strings for the
terminal you are using from the termcap file and the builtin termcaps.  Both
are always used, if an entry for the terminal you are using is present.  Which
one is used first depends on the 'ttybuiltin' option:

'ttybuiltin' on		1: builtin termcap	2: external termcap
'ttybuiltin' off	1: external termcap	2: builtin termcap

If an option is missing in one of them, it will be obtained from the other
one.  If an option is present in both, the one first encountered is used.

Which external termcap file is used varies from system to system and may
depend on the environment variables "TERMCAP" and "TERMPATH".  See "man
tgetent".

Settings depending on terminal			*term-dependent-settings*

If you want to set options or mappings, depending on the terminal name, you
can do this best in your .vimrc.  Example: >

   if &term == "xterm"
     ... xterm maps and settings ...
   elseif &term =~ "vt10."
     ... vt100, vt102 maps and settings ...
   endif
<
						*raw-terminal-mode*
For normal editing the terminal will be put into "raw" mode.  The strings
defined with 't_ti' and 't_ks' will be sent to the terminal.  Normally this
puts the terminal in a state where the termcap codes are valid and activates
the cursor and function keys.  When Vim exits the terminal will be put back
into the mode it was before Vim started.  The strings defined with 't_te' and
't_ke' will be sent to the terminal.  On the Amiga, with commands that execute
an external command (e.g., "!!"), the terminal will be put into Normal mode
for a moment.  This means that you can stop the output to the screen by
hitting a printing key.  Output resumes when you hit <BS>.

							*cs7-problem*
Note: If the terminal settings are changed after running Vim, you might have
an illegal combination of settings.  This has been reported on Solaris 2.5
with "stty cs8 parenb", which is restored as "stty cs7 parenb".  Use
"stty cs8 -parenb -istrip" instead, this is restored correctly.

Some termcap entries are wrong in the sense that after sending 't_ks' the
cursor keys send codes different from the codes defined in the termcap.  To
avoid this you can set 't_ks' (and 't_ke') to empty strings.  This must be
done during initialization (see |initialization|), otherwise it's too late.

Some termcap entries assume that the highest bit is always reset.  For
example: The cursor-up entry for the Amiga could be ":ku=\E[A:".  But the
Amiga really sends "\233A".  This works fine if the highest bit is reset,
e.g., when using an Amiga over a serial line.  If the cursor keys don't work,
try the entry ":ku=\233A:".

Some termcap entries have the entry ":ku=\E[A:".  But the Amiga really sends
"\233A".  On output "\E[" and "\233" are often equivalent, on input they
aren't.  You will have to change the termcap entry, or change the key code with
the :set command to fix this.

Many cursor key codes start with an <Esc>.  Vim must find out if this is a
single hit of the <Esc> key or the start of a cursor key sequence.  It waits
for a next character to arrive.  If it does not arrive within one second a
single <Esc> is assumed.  On very slow systems this may fail, causing cursor
keys not to work sometimes.  If you discover this problem reset the 'timeout'
option.  Vim will wait for the next character to arrive after an <Esc>.  If
you want to enter a single <Esc> you must type it twice.  Resetting the
'esckeys' option avoids this problem in Insert mode, but you lose the
possibility to use cursor and function keys in Insert mode.

On the Amiga the recognition of window resizing is activated only when the
terminal name is "amiga" or "builtin_amiga".

Some terminals have confusing codes for the cursor keys.  The televideo 925 is
such a terminal.  It sends a CTRL-H for cursor-left.  This would make it
impossible to distinguish a backspace and cursor-left.  To avoid this problem
CTRL-H is never recognized as cursor-left.

					*vt100-cursor-keys* *xterm-cursor-keys*
Other terminals (e.g., vt100 and xterm) have cursor keys that send <Esc>OA,
<Esc>OB, etc.  Unfortunately these are valid commands in insert mode: Stop
insert, Open a new line above the new one, start inserting 'A', 'B', etc.
Instead of performing these commands Vim will erroneously recognize this typed
key sequence as a cursor key movement.  To avoid this and make Vim do what you
want in either case you could use these settings: >
	:set notimeout		" don't timeout on mappings
	:set ttimeout		" do timeout on terminal key codes
	:set timeoutlen=100	" timeout after 100 msec
This requires the key-codes to be sent within 100msec in order to recognize
them as a cursor key.  When you type you normally are not that fast, so they
are recognized as individual typed commands, even though Vim receives the same
sequence of bytes.

				*vt100-function-keys* *xterm-function-keys*
An xterm can send function keys F1 to F4 in two modes: vt100 compatible or
not.  Because Vim may not know what the xterm is sending, both types of keys
are recognized.  The same happens for the <Home> and <End> keys.
			normal			vt100 ~
	<F1>	t_k1	<Esc>[11~	<xF1>	<Esc>OP	    *<xF1>-xterm*
	<F2>	t_k2	<Esc>[12~	<xF2>	<Esc>OQ	    *<xF2>-xterm*
	<F3>	t_k3	<Esc>[13~	<xF3>	<Esc>OR	    *<xF3>-xterm*
	<F4>	t_k4	<Esc>[14~	<xF4>	<Esc>OS	    *<xF4>-xterm*
	<Home>	t_kh	<Esc>[7~	<xHome>	<Esc>OH	    *<xHome>-xterm*
	<End>	t_@7	<Esc>[4~	<xEnd>	<Esc>OF	    *<xEnd>-xterm*

When Vim starts, <xF1> is mapped to <F1>, <xF2> to <F2> etc.  This means that
by default both codes do the same thing.  If you make a mapping for <xF2>,
because your terminal does have two keys, the default mapping is overwritten,
thus you can use the <F2> and <xF2> keys for something different.

							*xterm-shifted-keys*
Newer versions of xterm support shifted function keys and special keys.  Vim
recognizes most of them.  Use ":set termcap" to check which are supported and
what the codes are.  Mostly these are not in a termcap, they are only
supported by the builtin_xterm termcap.

							*xterm-modifier-keys*
Newer versions of xterm support Alt and Ctrl for most function keys.  To avoid
having to add all combinations of Alt, Ctrl and Shift for every key a special
sequence is recognized at the end of a termcap entry: ";*X".  The "X" can be
any character, often '~' is used.  The ";*" stands for an optional modifier
argument.  ";2" is Shift, ";3" is Alt, ";5" is Ctrl and ";9" is Meta (when
it's different from Alt).  They can be combined.  Examples: >
	:set <F8>=^[[19;*~
	:set <Home>=^[[1;*H
Another speciality about these codes is that they are not overwritten by
another code.  That is to avoid that the codes obtained from xterm directly
|t_RV| overwrite them.
							*xterm-scroll-region*
The default termcap entry for xterm on Sun and other platforms does not
contain the entry for scroll regions.  Add ":cs=\E[%i%d;%dr:" to the xterm
entry in /etc/termcap and everything should work.

							*xterm-end-home-keys*
On some systems (at least on FreeBSD with XFree86 3.1.2) the codes that the
<End> and <Home> keys send contain a <Nul> character.  To make these keys send
the proper key code, add these lines to your ~/.Xdefaults file:

*VT100.Translations:		#override \n\
		<Key>Home: string("0x1b") string("[7~") \n\
		<Key>End: string("0x1b") string("[8~")

						*xterm-8bit* *xterm-8-bit*
Xterm can be run in a mode where it uses 8-bit escape sequences.  The CSI code
is used instead of <Esc>[.  The advantage is that an <Esc> can quickly be
recognized in Insert mode, because it can't be confused with the start of a
special key.
For the builtin termcap entries, Vim checks if the 'term' option contains
"8bit" anywhere.  It then uses 8-bit characters for the termcap entries, the
mouse and a few other things.  You would normally set $TERM in your shell to
"xterm-8bit" and Vim picks this up and adjusts to the 8-bit setting
automatically.
When Vim receives a response to the |t_RV| (request version) sequence and it
starts with CSI, it assumes that the terminal is in 8-bit mode and will
convert all key sequences to their 8-bit variants.

==============================================================================
2. Terminal options				*terminal-options* *E436*

The terminal options can be set just like normal options.  But they are not
shown with the ":set all" command.  Instead use ":set termcap".

It is always possible to change individual strings by setting the
appropriate option.  For example: >
	:set t_ce=^V^[[K	(CTRL-V, <Esc>, [, K)

{Vi: no terminal options.  You have to exit Vi, edit the termcap entry and
try again}

The options are listed below.  The associated termcap code is always equal to
the last two characters of the option name.  Only one termcap code is
required: Cursor motion, 't_cm'.

The options 't_da', 't_db', 't_ms', 't_xs' represent flags in the termcap.
When the termcap flag is present, the option will be set to "y".  But any
non-empty string means that the flag is set.  An empty string means that the
flag is not set.  't_CS' works like this too, but it isn't a termcap flag.

OUTPUT CODES
	option	meaning	~

	t_AB	set background color (ANSI)			*t_AB* *'t_AB'*
	t_AF	set foreground color (ANSI)			*t_AF* *'t_AF'*
	t_AL	add number of blank lines			*t_AL* *'t_AL'*
	t_al	add new blank line				*t_al* *'t_al'*
	t_bc	backspace character				*t_bc* *'t_bc'*
	t_cd	clear to end of screen				*t_cd* *'t_cd'*
	t_ce	clear to end of line				*t_ce* *'t_ce'*
	t_cl	clear screen					*t_cl* *'t_cl'*
	t_cm	cursor motion (required!)		  *E437* *t_cm* *'t_cm'*
	t_Co	number of colors				*t_Co* *'t_Co'*
	t_CS	if non-empty, cursor relative to scroll region	*t_CS* *'t_CS'*
	t_cs	define scrolling region				*t_cs* *'t_cs'*
	t_CV	define vertical scrolling region		*t_CV* *'t_CV'*
	t_da	if non-empty, lines from above scroll down	*t_da* *'t_da'*
	t_db	if non-empty, lines from below scroll up	*t_db* *'t_db'*
	t_DL	delete number of lines				*t_DL* *'t_DL'*
	t_dl	delete line					*t_dl* *'t_dl'*
	t_fs	set window title end (from status line)		*t_fs* *'t_fs'*
	t_ke	exit "keypad transmit" mode			*t_ke* *'t_ke'*
	t_ks	start "keypad transmit" mode			*t_ks* *'t_ks'*
	t_le	move cursor one char left			*t_le* *'t_le'*
	t_mb	blinking mode					*t_mb* *'t_mb'*
	t_md	bold mode					*t_md* *'t_md'*
	t_me	Normal mode (undoes t_mr, t_mb, t_md and color)	*t_me* *'t_me'*
	t_mr	reverse (invert) mode				*t_mr* *'t_mr'*
								*t_ms* *'t_ms'*
	t_ms	if non-empty, cursor can be moved in standout/inverse mode
	t_nd	non destructive space character			*t_nd* *'t_nd'*
	t_op	reset to original color pair			*t_op* *'t_op'*
	t_RI	cursor number of chars right			*t_RI* *'t_RI'*
	t_Sb	set background color				*t_Sb* *'t_Sb'*
	t_Sf	set foreground color				*t_Sf* *'t_Sf'*
	t_se	standout end					*t_se* *'t_se'*
	t_so	standout mode					*t_so* *'t_so'*
	t_sr	scroll reverse (backward)			*t_sr* *'t_sr'*
	t_te	out of "termcap" mode				*t_te* *'t_te'*
	t_ti	put terminal in "termcap" mode			*t_ti* *'t_ti'*
	t_ts	set window title start (to status line)		*t_ts* *'t_ts'*
	t_ue	underline end					*t_ue* *'t_ue'*
	t_us	underline mode					*t_us* *'t_us'*
	t_Ce	undercurl end					*t_Ce* *'t_Ce'*
	t_Cs	undercurl mode					*t_Cs* *'t_Cs'*
	t_ut	clearing uses the current background color	*t_ut* *'t_ut'*
	t_vb	visual bell					*t_vb* *'t_vb'*
	t_ve	cursor visible					*t_ve* *'t_ve'*
	t_vi	cursor invisible				*t_vi* *'t_vi'*
	t_vs	cursor very visible				*t_vs* *'t_vs'*
								*t_xs* *'t_xs'*
	t_xs	if non-empty, standout not erased by overwriting (hpterm)
	t_ZH	italics mode					*t_ZH* *'t_ZH'*
	t_ZR	italics end					*t_ZR* *'t_ZR'*

Added by Vim (there are no standard codes for these):
	t_IS	set icon text start				*t_IS* *'t_IS'*
	t_IE	set icon text end				*t_IE* *'t_IE'*
	t_WP	set window position (Y, X) in pixels		*t_WP* *'t_WP'*
	t_WS	set window size (height, width) in characters	*t_WS* *'t_WS'*
	t_SI    start insert mode (bar cursor shape)            *t_SI* *'t_SI'*
	t_EI    end insert mode (block cursor shape)            *t_EI* *'t_EI'*
	t_RV	request terminal version string (for xterm)	*t_RV* *'t_RV'*
		|xterm-8bit| |v:termresponse| |'ttymouse'| |xterm-codes|

KEY CODES
Note: Use the <> form if possible

	option	name		meaning	~

	t_ku	<Up>		arrow up			*t_ku* *'t_ku'*
	t_kd	<Down>		arrow down			*t_kd* *'t_kd'*
	t_kr	<Right>		arrow right			*t_kr* *'t_kr'*
	t_kl	<Left>		arrow left			*t_kl* *'t_kl'*
		<xUp>		alternate arrow up		*<xUp>*
		<xDown>		alternate arrow down		*<xDown>*
		<xRight>	alternate arrow right		*<xRight>*
		<xLeft>		alternate arrow left		*<xLeft>*
		<S-Up>		shift arrow up
		<S-Down>	shift arrow down
	t_%i	<S-Right>	shift arrow right		*t_%i* *'t_%i'*
	t_#4	<S-Left>	shift arrow left		*t_#4* *'t_#4'*
	t_k1	<F1>		function key 1			*t_k1* *'t_k1'*
		<xF1>		alternate F1			*<xF1>*
	t_k2	<F2>		function key 2		*<F2>*	*t_k2* *'t_k2'*
		<xF2>		alternate F2			*<xF2>*
	t_k3	<F3>		function key 3		*<F3>*	*t_k3* *'t_k3'*
		<xF3>		alternate F3			*<xF3>*
	t_k4	<F4>		function key 4		*<F4>*	*t_k4* *'t_k4'*
		<xF4>		alternate F4			*<xF4>*
	t_k5	<F5>		function key 5		*<F5>*	*t_k5* *'t_k5'*
	t_k6	<F6>		function key 6		*<F6>*	*t_k6* *'t_k6'*
	t_k7	<F7>		function key 7		*<F7>*	*t_k7* *'t_k7'*
	t_k8	<F8>		function key 8		*<F8>*	*t_k8* *'t_k8'*
	t_k9	<F9>		function key 9		*<F9>*	*t_k9* *'t_k9'*
	t_k;	<F10>		function key 10		*<F10>*	*t_k;* *'t_k;'*
	t_F1	<F11>		function key 11		*<F11>* *t_F1* *'t_F1'*
	t_F2	<F12>		function key 12		*<F12>*	*t_F2* *'t_F2'*
	t_F3	<F13>		function key 13		*<F13>*	*t_F3* *'t_F3'*
	t_F4	<F14>		function key 14		*<F14>*	*t_F4* *'t_F4'*
	t_F5	<F15>		function key 15		*<F15>*	*t_F5* *'t_F5'*
	t_F6	<F16>		function key 16		*<F16>*	*t_F6* *'t_F6'*
	t_F7	<F17>		function key 17		*<F17>*	*t_F7* *'t_F7'*
	t_F8	<F18>		function key 18		*<F18>*	*t_F8* *'t_F8'*
	t_F9	<F19>		function key 19		*<F19>*	*t_F9* *'t_F9'*
		<S-F1>		shifted function key 1
		<S-xF1>		alternate <S-F1>		*<S-xF1>*
		<S-F2>		shifted function key 2		*<S-F2>*
		<S-xF2>		alternate <S-F2>		*<S-xF2>*
		<S-F3>		shifted function key 3		*<S-F3>*
		<S-xF3>		alternate <S-F3>		*<S-xF3>*
		<S-F4>		shifted function key 4		*<S-F4>*
		<S-xF4>		alternate <S-F4>		*<S-xF4>*
		<S-F5>		shifted function key 5		*<S-F5>*
		<S-F6>		shifted function key 6		*<S-F6>*
		<S-F7>		shifted function key 7		*<S-F7>*
		<S-F8>		shifted function key 8		*<S-F8>*
		<S-F9>		shifted function key 9		*<S-F9>*
		<S-F10>		shifted function key 10		*<S-F10>*
		<S-F11>		shifted function key 11		*<S-F11>*
		<S-F12>		shifted function key 12		*<S-F12>*
	t_%1	<Help>		help key			*t_%1* *'t_%1'*
	t_&8	<Undo>		undo key			*t_&8* *'t_&8'*
	t_kI	<Insert>	insert key			*t_kI* *'t_kI'*
	t_kD	<Del>		delete key			*t_kD* *'t_kD'*
	t_kb	<BS>		backspace key			*t_kb* *'t_kb'*
	t_kB	<S-Tab>		back-tab (shift-tab)  *<S-Tab>* *t_kB* *'t_kB'*
	t_kh	<Home>		home key			*t_kh* *'t_kh'*
	t_#2	<S-Home>	shifted home key     *<S-Home>* *t_#2* *'t_#2'*
		<xHome>		alternate home key		*<xHome>*
	t_@7	<End>		end key				*t_@7* *'t_@7'*
	t_*7	<S-End>		shifted end key	*<S-End>* *t_star7* *'t_star7'*
		<xEnd>		alternate end key		*<xEnd>*
	t_kP	<PageUp>	page-up key			*t_kP* *'t_kP'*
	t_kN	<PageDown>	page-down key			*t_kN* *'t_kN'*
	t_K1	<kHome>		keypad home key			*t_K1* *'t_K1'*
	t_K4	<kEnd>		keypad end key			*t_K4* *'t_K4'*
	t_K3	<kPageUp>	keypad page-up key		*t_K3* *'t_K3'*
	t_K5	<kPageDown>	keypad page-down key		*t_K5* *'t_K5'*
	t_K6	<kPlus>		keypad plus key	      *<kPlus>*	*t_K6* *'t_K6'*
	t_K7	<kMinus>	keypad minus key     *<kMinus>*	*t_K7* *'t_K7'*
	t_K8	<kDivide>	keypad divide	    *<kDivide>* *t_K8* *'t_K8'*
	t_K9	<kMultiply>	keypad multiply   *<kMultiply>* *t_K9* *'t_K9'*
	t_KA	<kEnter>	keypad enter key     *<kEnter>*	*t_KA* *'t_KA'*
	t_KB	<kPoint>	keypad decimal point *<kPoint>*	*t_KB* *'t_KB'*
	t_KC	<k0>		keypad 0		 *<k0>*	*t_KC* *'t_KC'*
	t_KD	<k1>		keypad 1		 *<k1>*	*t_KD* *'t_KD'*
	t_KE	<k2>		keypad 2		 *<k2>*	*t_KE* *'t_KE'*
	t_KF	<k3>		keypad 3		 *<k3>*	*t_KF* *'t_KF'*
	t_KG	<k4>		keypad 4		 *<k4>*	*t_KG* *'t_KG'*
	t_KH	<k5>		keypad 5		 *<k5>*	*t_KH* *'t_KH'*
	t_KI	<k6>		keypad 6		 *<k6>*	*t_KI* *'t_KI'*
	t_KJ	<k7>		keypad 7		 *<k7>*	*t_KJ* *'t_KJ'*
	t_KK	<k8>		keypad 8		 *<k8>*	*t_KK* *'t_KK'*
	t_KL	<k9>		keypad 9		 *<k9>*	*t_KL* *'t_KL'*
		<Mouse>		leader of mouse code		*<Mouse>*

Note about t_so and t_mr: When the termcap entry "so" is not present the
entry for "mr" is used.  And vice versa.  The same is done for "se" and "me".
If your terminal supports both inversion and standout mode, you can see two
different modes.  If your terminal supports only one of the modes, both will
look the same.

							*keypad-comma*
The keypad keys, when they are not mapped, behave like the equivalent normal
key.  There is one exception: if you have a comma on the keypad instead of a
decimal point, Vim will use a dot anyway.  Use these mappings to fix that: >
	:noremap <kPoint> ,
	:noremap! <kPoint> ,
<							*xterm-codes*
There is a special trick to obtain the key codes which currently only works
for xterm.  When |t_RV| is defined and a response is received which indicates
an xterm with patchlevel 141 or higher, Vim uses special escape sequences to
request the key codes directly from the xterm.  The responses are used to
adjust the various t_ codes.  This avoids the problem that the xterm can
produce different codes, depending on the mode it is in (8-bit, VT102,
VT220, etc.).  The result is that codes like <xF1> are no longer needed.
Note: This is only done on startup.  If the xterm options are changed after
Vim has started, the escape sequences may not be recognized any more.

							*termcap-colors*
Note about colors: The 't_Co' option tells Vim the number of colors available.
When it is non-zero, the 't_AB' and 't_AF' options are used to set the color.
If one of these is not available, 't_Sb' and 't_Sf' are used.  't_me' is used
to reset to the default colors.

				*termcap-cursor-shape* *termcap-cursor-color*
When Vim enters Insert mode the 't_SI' escape sequence is sent.  When leaving
Insert mode 't_EI' is used.  But only if both are defined.  This can be used
to change the shape or color of the cursor in Insert mode.  These are not
standard termcap/terminfo entries, you need to set them yourself.
Example for an xterm, this changes the color of the cursor: >
    if &term =~ "xterm"
	let &t_SI = "\<Esc>]12;purple\x7"
	let &t_EI = "\<Esc>]12;blue\x7"
    endif
NOTE: When Vim exits the shape for Normal mode will remain.  The shape from
before Vim started will not be restored.

							*termcap-title*
The 't_ts' and 't_fs' options are used to set the window title if the terminal
allows title setting via sending strings.  They are sent before and after the
title string, respectively.  Similar 't_IS' and 't_IE'  are used to set the
icon text.  These are Vim-internal extensions of the Unix termcap, so they
cannot be obtained from an external termcap.  However, the builtin termcap
contains suitable entries for xterm and iris-ansi, so you don't need to set
them here.
							*hpterm*
If inversion or other highlighting does not work correctly, try setting the
't_xs' option to a non-empty string.  This makes the 't_ce' code be used to
remove highlighting from a line.  This is required for "hpterm".  Setting the
'weirdinvert' option has the same effect as making 't_xs' non-empty, and vice
versa.

							*scroll-region*
Some termcaps do not include an entry for 'cs' (scroll region), although the
terminal does support it.  For example: xterm on a Sun.  You can use the
builtin_xterm or define t_cs yourself.  For example: >
	:set t_cs=^V^[[%i%d;%dr
Where ^V is CTRL-V and ^[ is <Esc>.

The vertical scroll region t_CV is not a standard termcap code.  Vim uses it
internally in the GUI.  But it can also be defined for a terminal, if you can
find one that supports it.  The two arguments are the left and right column of
the region which to restrict the scrolling to.  Just like t_cs defines the top
and bottom lines.  Defining t_CV will make scrolling in vertically split
windows a lot faster.  Don't set t_CV when t_da or t_db is set (text isn't
cleared when scrolling).

Unfortunately it is not possible to deduce from the termcap how cursor
positioning should be done when using a scrolling region: Relative to the
beginning of the screen or relative to the beginning of the scrolling region.
Most terminals use the first method.  A known exception is the MS-DOS console
(pcterm).  The 't_CS' option should be set to any string when cursor
positioning is relative to the start of the scrolling region.  It should be
set to an empty string otherwise.  It defaults to "yes" when 'term' is
"pcterm".

Note for xterm users: The shifted cursor keys normally don't work.  You can
	make them work with the xmodmap command and some mappings in Vim.

	Give these commands in the xterm:
		xmodmap -e "keysym Up = Up F13"
		xmodmap -e "keysym Down = Down F16"
		xmodmap -e "keysym Left = Left F18"
		xmodmap -e "keysym Right = Right F19"

	And use these mappings in Vim:
		:map <t_F3> <S-Up>
		:map! <t_F3> <S-Up>
		:map <t_F6> <S-Down>
		:map! <t_F6> <S-Down>
		:map <t_F8> <S-Left>
		:map! <t_F8> <S-Left>
		:map <t_F9> <S-Right>
		:map! <t_F9> <S-Right>

Instead of, say, <S-Up> you can use any other command that you want to use the
shift-cursor-up key for.  (Note: To help people that have a Sun keyboard with
left side keys F14 is not used because it is confused with the undo key; F15
is not used, because it does a window-to-front; F17 is not used, because it
closes the window.  On other systems you can probably use them.)

==============================================================================
3. Window size						*window-size*

[This is about the size of the whole window Vim is using, not a window that is
created with the ":split" command.]

If you are running Vim on an Amiga and the terminal name is "amiga" or
"builtin_amiga", the amiga-specific window resizing will be enabled.  On Unix
systems three methods are tried to get the window size:

- an ioctl call (TIOCGSIZE or TIOCGWINSZ, depends on your system)
- the environment variables "LINES" and "COLUMNS"
- from the termcap entries "li" and "co"

If everything fails a default size of 24 lines and 80 columns is assumed.  If
a window-resize signal is received the size will be set again.  If the window
size is wrong you can use the 'lines' and 'columns' options to set the
correct values.

One command can be used to set the screen size:

						*:mod* *:mode* *E359* *E362*
:mod[e] [mode]

Without argument this only detects the screen size and redraws the screen.
With MS-DOS it is possible to switch screen mode.  [mode] can be one of these
values:
	"bw40"		40 columns black&white
	"c40"		40 columns color
	"bw80"		80 columns black&white
	"