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DOSBOX(1)							     DOSBOX(1)

       dosbox - an x86/DOS emulator with sound/graphics

       dosbox  [-fullscreen]  [-conf  configfile]  [-lang langfile] [file] [-c
       command] [-exit]

       This manual page briefly documents dosbox, an x86/DOS emulator.

       The optional file argument should be a DOS executable or	 a  directory.
       If  it  is a dos executable (.com .exe .bat) the program will run auto‐
       matically. If it is a directory, a DOS session will run with the direc‐
       tory mounted as C:.

       A summary of options is included below.

	      Start dosbox in fullscreen mode.

       -c command
	      Runs  the	 specified command before running file.	 Multiple com‐
	      mands can be  specified.	Each  command  should  start  with  -c

       -conf configfile
	      Start dosbox with the options specified in configfile.

       -lang langfile
	      Start dosbox with the language specified in langfile.

       -exit  dosbox will exit after running the program specified by file.

       dosbox supports most of the DOS commands found in In addi‐
       tion, the following extra commands are available:

       MOUNT  [-t  type]  [-size  size]	 driveletter  sourcedirectory  [-aspi]
	      [-ioctl] [-usecd number] [-label drivelabel]

       MOUNT -cd

       Program to mount local directories as drives inside dosbox.

		     The driveletter inside dosbox (eg. C).

		     The local directory you want to have inside dosbox.

	      -t type
		     Type  of the mounted directory. Supported are: dir (stan‐
		     dard), floppy, cdrom.

	      -size drivesize
		     Sets the size of the drive.

	      -label drivelabel
		     Sets the name of the drive to drivelabel. Needed on  some
		     systems if the cd label isn't read correctly. Useful when
		     a program can't find its cdrom.

	      -aspi  Forces to use the aspi layer. Only valid  if  mounting  a
		     cdrom under Windows systems with an ASPI-Layer.

	      -ioctl Forces  to	 use  ioctl commands. Only valid if mounting a
		     cdrom under windows which support them (Win2000/XP/NT).

	      -usecd number
		     Forces to use SDL cdrom support for drive number.	Number
		     can be found by -cd. Valid on all systems.

	      -cd    Displays all detected cdrom drives and their numbers. Use
		     with -usecd.


       To mount your /home/dos/dosgames directory as C drive in dosbox:
	      mount c /home/dos/dosgames


       Display the amount of free memory

       CONFIG [-writeconf] [-writelang] file

       Write the current configuration or language settings to file, which  is
       located on the local filesystem. Not a mounted drive in dosbox.

       LOADFIX [-size] [programname] [parameters]

       LOADFIX -f

       Program	to  eat	 up memory, Useful for old programs which don't expect
       much memory to be free.

		     The name of the program which is executed	after  loadfix
		     eats up its memory.

		     Parameters given to the programname executable.

	      -size  The  amount of memory to eat up (in kb). Example -32, -64
		     or -128

	      -f     Frees all memory eaten up by loadfix.

       Configuration and language files use a format similar to	 Windows  .ini
       files.  If  a file named dosbox.conf is found in the current directory,
       it will be automatically loaded.

       ALT-ENTER   Go full screen and back.

       CTRL-F5	   Save a screenshot.

       CTRL-F6	   Start/Stop recording sound output to a wave file.

       CTRL-F7	   Decrease frameskip.

       CTRL-F8	   Increase frameskip.

       CTRL-F9	   Kill dosbox.

       CTRL-F10	   Capture/Release the mouse.

       CTRL-F11	   Slow down emulation (Increase DOSBox Cycles).

       CTRL-F12	   Speed up emulation (Decrease DOSBox Cycles).

       Note: Once you increase your  DOSBox  cycles  beyond  your  com‐
       puter's	maximum	 capacity,  it	will produce the same effect as
       slowing down the emulation.  This maximum will  vary  from  com‐
       puter to computer, there is no standard.

       Fast  machine.  My  guess  would be pentium-2 400+ to get decent
       emulation of games written for an 286  machine.	 For  protected
       mode  games a 1 Ghz machine is recommended and don't expect them
       to run fast though!! Be sure to read the next section on how  to
       speed it up somewhat.

   To run resource-demanding games
       dosbox  emulates	 the CPU, the sound and graphic cards, and some
       other  stuff, all at the same time. You can overclock dosbox  by
       using  CTRL-F12,	 but  you'll  be  limited  by the power of your
       actual CPU. You can see how much free time your true CPU has  by
       various	utils  (top).	Once 100% of your real CPU time is used
       there is no further way to speed up dosbox unless you reduce the
       load generated by the non-CPU parts of dosbox.


       Close every program but dosbox.

       Overclock  dosbox until 100% of your CPU is used.(CTR-+F12)

       Since  VGA  emulation  is  the  most demanding part of dosbox in
       terms of actual CPU usage, we'll start here. Increase the number
       of  frames  skipped  (in increments of one) by pressing CRTL-F8.
       Your CPU usage should decrease.	Go back	 one  step  and	 repeat
       this  until the game runs fast enough for you.  Please note that
       this is a trade off: you lose in fluidity of video what you gain
       in speed.

       While  we hope that, one day, dosbox will run virtually all pro‐
       grams ever made for the PC...  we are not there yet. At present,
       dosbox  run on a 1.7 Gigahertz PC is roughly the equivalent of a
       25MHz 386 PC.  While the 0.60  release  has  added  support  for
       "protected  mode" allowing for more complex and recent programs,
       but note that this support is early in development  and	nowhere
       near as complete as the support for 386 real-mode games (or ear‐
       lier). Also note that "protected mode" games need  substantially
       more  resources	and may require a much faster processor for you
       to run it properly in dosbox.

       Not all DOS programs work properly.  dosbox  will  exit	without
       warning if an error occured.

       The README in /usr/share/doc/dosbox

       This  manual  page  was	written	 by  Peter  Veenstra <H.P.Veen‐> and	 James	Oakley	<>,
       for the Debian system (but may be used by others).

				October 5, 2003			     DOSBOX(1)

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