Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages


home | help
SCON(1)			FreeBSD	General	Commands Manual		       SCON(1)

     scon -- controls screen modes for pcvt video driver

     scon [-a] [-c screenno] [-d device] [-f on|off] [-h] [-H] [-l] [-m] [-v]
	  [-V] [-s lines]
     scon [-v] [-d device] -p entry,red,green,blue
     scon [-v] [-d device] -p default
     scon [-v] [-d device] -p list
     scon [-v] -t timeout
     scon [-v] -1 | -8

     The scon utility controls several aspects of the runtime behaviour	of the
     pcvt vt220	driver.

     The options are as	follows:

     -a	     Returns a string describing the video adaptor found by pcvt, the
	     string returned could be MDA, HGC,	CGA, EGA, VGA or UNKNOWN.

     -c	     Specify the screen	number the current (displayed) screen should
	     be	switched to.

     -d	     Specify the device	filename (i.e.,	/dev/ttyv2) further operations
	     specified on the command line should be applied to.

     -f	     Some programs which silently assume 24 lines when they run	on a
	     VT220 show	incorrect behaviour when the terminal has really 25
	     lines.  To	support	full VT220 behaviour, it is possible to	force
	     pcvt to select only 24 lines when it is running in	25-lines pure
	     VT	mode and/or in 28-lines	HP-mode.  The -f option	requires one
	     additional	parameter, the string 'on' or 'off' to switch this
	     mode for a	virtual	screen on or off respectively.	This mode has
	     no	effect if any other vertical resolutions are selected than the
	     two above mentioned.

     -h	     Prints a usage/help text.

     -l	     Lists the current configuration of	runtime	changeable options and
	     fixed parameters (such as the type	of the adaptor,	and in case of
	     a VGA adaptor, the	Manufacturer, Chipset and 132 column support)
	     of	the output portion of the pcvt driver.

     -m	     Returns a string describing the connected display monitor type
	     found by pcvt, the	string returned	can be MONO, COLOR or UNKNOWN.

     -v	     Specify verbose operation of the program.

     -V	     Switch the	specified/current screen into a	pure VT220 mode	with-
	     out recognizing any HP escape sequences and without displaying
	     function key labels.

     -H	     Switch the	specified/current screen into a	mixed HP/VT220 mode.
	     That is, that in addition to the full VT220 emulation, the	HP
	     function key labels and the escape	sequences for handling the
	     labels are	available to the user.

     -s	     Specify the number	of character lines on the screen.  Possible
	     parameters	are 25,	28, 35,	40, 43 or 50.  To use all this screen
	     sizes, the	fonts required for proper operation of a desired size
	     have to be	downloaded to the EGA/VGA font ram.  This option is
	     available only for	EGA and	VGA boards.

     -p	     Modify VGA	palette	(DAC).	The -p is mutually exclusive with -s,
	     -H, and -V.  Naturally, option -p is available only for VGA
	     boards.  Three flavors are	available.

	     If	used with argument ``default'',	this flag will restore the
	     default palette (as installed by VGA ROM BIOS after hardware

	     If	used with argument ``list'', the current VGA DAC palette
	     entries are listed.  Each entry contains the table	index, values
	     for red, green, and blue, and if there's a	known name for this
	     entry, the	color name.  Trailing empty table slots	(RGB values
	     all zero) are omitted.

	     Otherwise,	four comma-separated arguments are expected.  The
	     first denotes the number of palette entry to be modified.	This
	     may be either a number between 0 and 255, or the usual name of an
	     associated	color (case-insensitive).  The following values	for
	     red, green	and blue are restricted	to 0 through 63	due to VGA DAC
	     conventions.  Note	that the first delimiter within	such an	argu-
	     ment may be a colon ``:'' instead of a comma ``,''	for better
	     readability, but this violates common command argument conven-
	     tions.  Multiple -p options may be	specified if unambiguous.

     -t	     Specifying	-t will	activate the screen saver.  The	behaviour
	     depends on	timeout: if timeout is given as	0, the screen saver is
	     turned off.  Otherwise, timeout is	taken as a number of seconds
	     to	wait until activating the screen saver.	 NOTE: the -t option
	     is	only available if screen saver support has been	compiled into
	     the driver!

     -1	     Sets 132 columns mode (only available on VGA adaptors).

     -8	     Sets 80 columns mode.

     When switching between HP and VT mode, when switching the force 24	lines
     mode on and off, or when switching	between	80 and 132 columns operation,
     the screen	is cleared, the	scrolling region is reset and the cursor is
     placed in the home	position.

     The command ``scon	-H -s 28'' places the current screen into HP mode and
     sets the screen size to 28x80.

     Invoking ``scon -p	lightgray,0,15,0 -p 0:45,45,45'' will result in	green
     on	gray output for	normal text.  Note that	normal text color is light
     gray, and not white as one	might expect.

     the -c and	-d options collide somehow, this will change in	a future

     cursor(1),	loadfont(1), pcvt(4)

FreeBSD	11.1			March 27, 2000			  FreeBSD 11.1


Want to link to this manual page? Use this URL:

home | help