Provided by: stella_3.5-1ubuntu1_amd64 bug

NAME

       stella - Atari 2600 emulator

SYNOPSIS

       stella [options] <ROM file>

DESCRIPTION

       stella  is  a  comprehensive emulator of the old Atari 2600 video-game console. It support
       most Atari 2600 games and many peripherals.

OPTIONS

       stella accepts the following options:

       -video <soft|gl>
              Use SDL software or OpenGL rendering mode.

       -gl_lib <filename>
              OpenGL mode only. Specify The OpenGL library to use (only use this if you know what
              you're doing).

       -gl_filter <nearest|linear>
              OpenGL  mode  only.  Use GL_NEAREST or GL_LINEAR filtering. GL_NEAREST results in a
              scaled, pixelated image, while GL_LINEAR introduces blurring.

       -gl_aspectn <number>, -gl_aspectp <number>
              OpenGL mode only. Specify the amount (as a percentage) to scale the TIA image width
              in  NTSC  and  PAL  mode.  Since many video modes do not use square pixels, you can
              reduce width until the pixels appear square. Allowable values are 80 - 120; I  find
              85 - 90 gives the most authentic look for NTSC, and 105 - 110 for PAL.

       -gl_fsmax <1|0>
              OpenGL mode only. Strech TIA image while in fullscreen mode.

       -gl_vbo <1|0>
              OpenGL  mode  only.  Use  the Vertex Buffer Object extension, if available. This is
              enabled by default.

       -gl_vsync <1|0>
              OpenGL mode only. Synchronize screen updates to the vertical blank period. This can
              result in smoother updates, and eliminate tearing.

       -tia_filter <filter>
              Use  the  specified  filter  while  in  TIA/emulation  mode. Currently, this can be
              zoomZx, where Z is between 2 and 10 inclusive.

       -fullscreen <1|0|-1>
              Play the game in fullscreen mode (1),  in  a  window  (0),  or  completely  disable
              fullscreen mode (-1).

       -fullres <auto|WxH>
              Use the given resolution (WxH) in fullscreen mode. If auto, let Stella decide which
              resolution to use.

       -center <1|0>
              Centers game window (if possible).

       -palette <standard|z26|user>
              Sets the palette to either normal Stella, the one used in the z26  emulator,  or  a
              user-defined palette.

       -colorloss <1|0>
              Enable/disable the PAL color-loss effect.

       -framerate <number>
              Display  the  given  number  of  frames per second. Normally, Stella will determine
              framerate based on number of scanlines. Setting this  to  0  automatically  enables
              auto-frame calculation (ie, framerate based on scanlines).

       -timing <sleep|busy>
              Determines  type  of  wait to perform between processing frames. Sleep will release
              the CPU as much as possible, and is the preferred method on laptops (and other low-
              powered  devices)  and  when  using  GL  VSync.  Busy  will  emulate  z26 busy-wait
              behaviour, and use all possible CPU time, but may eliminate graphical 'tearing'  in
              software mode.

       -uimessages <1|0>
              Enable  or disablEnable or disable display of message in the UI. Note that messages
              indicating serious errors override this setting, and are always shown.

       -sound <1|0>
              Enable or disable sound generation.

       -fragsize <number>
              Specify the sound fragment size to use. Under Debian the recommended value is 512.

       -freq <number>
              Set sound sample output frequency (0 - 48000). Default  is  31400.  Do  not  change
              unless you experience sound issues.

       -tiafreq <number>
              Set  sound sample generation frequency (0 - 48000). Default is 31400. Do not change
              unless you experience sound issues.

       -volume <number>
              Set the volume (0 - 100).

       -clipvol <1|0>
              Enable volume clipping (eliminates popping). Do not change  unless  you  experience
              sound issues.

       -cheat <code>
              Use  the  specified  cheatcode (see the Cheat section in the provided documentation
              for a description of cheatcodes).

       -loglevel <0|1|2>
              Indicates level of logging to  perform  while  the  application  is  running.  Zero
              completely  disables  logging  (except  for  serious  errors),  while the remaining
              numbers show increasingly more detail.

       -logtoconsole <1|0>
              Indicates that logged output should be printed to the console/commandline  as  it's
              being  collected.  An internal log will still be kept, and the amount of logging is
              still controlled by loglevel.

       -joydeadzone <number>
              Sets the joystick deadzone area for analog joysticks. Accepts a number from 0 - 29,
              and  uses  the  formula 3200 + number * 1000. So the possible deadzone values range
              from 3200 to 32200.

       -joyallow4 <1|0>
              Allow all 4 directions on a joystick to  be  pressed  simultaneously.  Bumper  Bash
              ignores this setting, and always allows all 4 directions.

       -grabmouse <1|0>
              Keeps the mouse in the game window in emulation mode.

       -mcontrol <auto|XY>
              Enable using the mouse axes for various controllers automatically (paddle, driving,
              etc), or specifically use each axis for a particular paddle. In the latter case, XY
              indicates how to use the X/Y axis (ie, 02 is paddle0/paddle2).

       -dsense <number>
              Sensitivity  for emulation of paddles when using a digital device (joystick digital
              axis or button, keyboard key, etc.). number may range from 1  to  10,  with  larger
              numbers causing faster movement.

       -msense <number>
              Sensitivity for emulation of paddles when using a mouse. number may range from 1 to
              10, with larger numbers causing faster movement.

       -sa1 <left|right>
              Stelladaptor/2600-daptor 1 emulates specified joystick port.

       -sa2 <left|right>
              Stelladaptor/2600-daptor 2 emulates specified joystick port.

       -ctrlcombo <1|0>
              Use control-x key combos. This is normally enabled, since the Quit command is  tied
              to  'Control-q'.  However, there are times when a 2-player game is using either the
              'f' or 'r' keys for movement, and pressing  Control  (for  Fire)  will  perform  an
              unwanted action associated with Control-r or Control-f.

       -autoslot <1|0>
              Automatically switch to the next available save state slot after saving a ROM state
              file.

       -stats <1|0>
              Overlay console info on the TIA image during emulation.

       -fastscbios <1|0>
              Disable Supercharger BIOS progress loading bars.

       -snapdir <path>
              The directory to save snapshot files to.

       -sssingle <1|0>
              Generate single snapshot instead of many, overwriting any previous snapshots.

       -ss1x <1|0>
              Ignore any scaling applied to the TIA image, and save  snapshot  in  unscaled  (1x)
              mode.

       -ssinterval <number>
              Set  the  interval  in seconds between taking snapshots in continuous snapshot mode
              (currently, 1 - 10).

       -rominfo <rom>
              Display detailed information about the given ROM, and then exit Stella.

       -listrominfo
              Prints relevant contents of the Stella ROM database, one ROM  per  line,  and  then
              exit Stella. This can be used for external frontends.

       -uselauncher <1|0>
              Use  the  built-in  ROM launcher. If disabled, launching Stella will simply print a
              help message, and exiting a ROM will completely exit the program.

       -launcherres <WxH>
              Set the size of the ROM launcher.

       -launcherfont <small|medium|large>
              Set the size of the font in the ROM launcher.

       -launcherexts <allfiles|allroms|list>
              Specifies which files to show in the ROM launcher  (allfiles  is  self-explanatory,
              allroms is all files with valid ROM extensions (currently: a26, bin, rom, gz, zip),
              list is a ':' separated list of valid ROM extensions.

       -romviewer <0|1|2>
              Hide ROM info viewer in ROM launcher mode (0), or use the given zoom  level  (1  or
              2).

       -uipalette <1|2>
              Use the specified palette for UI elements. This isn't yet complete.

       -listdelay <delay>
              Set  the  amount of time to wait between treating successive keypresses as a single
              word in list widgets (value can range from 300-1000).

       -mwheel <lines>
              Set the number of lines a mousewheel will scroll in the UI.

       -romdir <dir>
              Set the directory where the ROM launcher will start.

       -statedir <dir>
              Set the directory in which to save state files.

       -cheatfile <file>
              Set the full pathname of the cheatfile database.

       -palettefile <file>
              Set the full pathname of the user-defined palette file.

       -propsfile <file>
              Set the full pathname of the ROM properties file.

       -eepromdir <dir>
              Set the directory in which to save EEPROM files.

       -cfgdir <dir>
              Set the directory in which to access Distella config files.

       -avoxport <name>
              Set the name of the serial port where an AtariVox is connected.

       -maxres <WxH>
              Useful for developers, this sets the maximum size of window that  can  be  created,
              allowing to simulate testing on 'smaller' systems.

       -help  Print a help message describing these options, and then exit Stella.

       The  following are useful to developers. Only use them if you know what you're doing! Note
       that in all cases, the values supplied to the arguments are not case sensitive.

       -resolvedata <never|always|auto>
              Try to differentiate between code vs. data sections in the  disassembler.  See  the
              Debugger section in the provided documentation for more information.

       -gfxformat <2|16>
              Sets the base to use for displaying GFX sections in the disassembler.

       -showaddr <1|0>
              Shows/hides opcode addresses in the disassembler.

       -debuggerres <WxH>
              Set the size of the debugger window.

       -break <address>
              Set a breakpoint at a specified address.

       -debug Immediately jump to debugger mode when starting Stella.

       -holdreset
              Start the emulator with the Game Reset switch held down.

       -holdselect
              Start the emulator with the Game Select switch held down.

       -holdbutton0
              Start the emulator with the left joystick button held down.

       -tiadriven <1|0>
              Set unused TIA pins to be randomly driven high or low on a read/peek.

       -ramrandom <1|0>
              On reset, either randomize all RAM content, or zero it out instead.

       -bs <type>, -type <type>
              Set  "Cartridge.Type"  property.  See  the  Game Properties section in the provided
              documentation for valid types.

       -channels <Mono|Stereo>
              Set "Cartridge.Sound" property.

       -ld <A|B>
              Set "Console.LeftDifficulty" property.

       -rd <A|B>
              Set "Console.RightDifficulty" property.

       -tv <Color|BlackAndWhite>
              Set "Console.TelevitionType" property.

       -sp <Yes|No>
              Set "Console.SwapPorts" property.

       -lc <type>
              Set "Controller.Left" property. See the Game Properties  section  in  the  provided
              documentation for valid types.

       -rc <type>
              Set  "Controller.Right"  property.  See the Game Properties section in the provided
              documentation for valid types.

       -bc <type>
              Sets  both  "Controller.Left"  and  "Controller.Right"  properties.  See  the  Game
              Properties section in the provided documentation for valid types.

       -cp <Yes|No>
              Set "Controller.SwapPaddles" property.

       -format <format>
              Set  "Display.Format"  property.  See  the  Game Properties section in the provided
              documentation for valid formats.

       -ystart <number>
              Set "Display.YStart" property (0 - 64).

       -height <number>
              Set "Display.Height" property (210 - 256).

       -pp <Yes|No>
              Set "Display.Phosphor" property.

       -ppblend <number>
              Set "Display.PPBlend" property, used for phosphor effect (0-100). Default is 77.

       -thumb.trapfatal <true|false>
              The default of true allows the Thumb ARM emulation to throw an exception and  enter
              the  debugger  on fatal errors. When disabled, such fatal errors are simply logged,
              and emulation continues. Do not use this unless you know exactly what you're doing,
              as it changes the behaviour as compared to real hardware.

KEYBOARD CONTROLS

       The  Atari  2600 console controls and controllers are mapped to the computer's keyboard as
       shown in the following sections. However, most of these events can be  remapped  to  other
       keys on your keyboard or buttons on your joystick.

   Console controls (can be remapped)
       Control + q
              Exit emulator

       Escape Exit game mode/enter launcher mode

       Tab    Enter/exit options mode

       Backslash (\)
              Enter/exit command mode

       Backquote (`)
              Enter/exit debugger

       F1     Select Game

       F2     Reset Game

       F3     Color TV

       F4     Black/White TV

       F5     Left Player Difficulty B

       F6     Left Player Difficulty A

       F7     Right Player Difficulty B

       F8     Right Player Difficulty A

       F9     Save state to current slot

       F10    Chaneg current state slot

       F11    Load state from current slot

       F12    Save PNG snapshot

       Pause  Pause/resume emulation

   Joystick / BoosterGrip Controller (can be remapped)
       Left joystick:

       Up arrow
              Joystick up

       Down arrow
              Joystick down

       Left arrow
              Joystick left

       Right arrow
              Joystick right

       Space  Fire button

       4      Trigger button

       5      Booster button

       Right joystick:

       Y      Joystick up

       H      Joystick down

       G      Joystick left

       J      Joystick right

       F      Fire button

       6      Trigger button

       7      Booster button

   Paddle Controller digital emulation (can be remapped independently of joystick controller)
       By default the left paddles are mapped to the left joystick as follows:

       Left   Paddle 0 decrease

       Right  Paddle 0 increase

       Fire   Paddle 0 fire

       Up     Paddle 1 decrease

       Down   Paddle 1 increase

       Booster
              Paddle 1 fire

       The  same  mappings on the right joystick correspond to the right paddles (paddles 2 and 3
       respectively).

   Driving Controller (cannot be remapped, always associated with joystick controllers)
       Each driving controller is mapped to the corresponding joystick, using the left, right and
       fire controls.

   Sega  Genesis Controller (cannot be remapped, always associated with joystick and booster-grip
       controllers)
       Each pad is mapped to the correspondig joystick as follows:

       Up     Up

       Down   Down

       Left   Left

       Right  Right

       Fire   Button 'B'

       Booster
              Button 'C'

   Keypad Controller (can be remapped)
       Left keypad (press the key on the left to emulate the key on the right):

       1      1

       2      2

       3      3

       Q      4

       W      5

       E      6

       A      7

       S      8

       D      9

       Z      .

       X      0

       C      #

       Right keypad:

       8      1

       9      2

       0 (the digit)
              3

       I      4

       O (the letter)
              5

       P      6

       K      7

       L      8

       ;      9

       ,      .

       .      0

       /      #

FILES

       ~/.stella/stellarc
              Default options (command line options override these). Lines starting with ';'  are
              considered comments and are ignored. Any other line must be of the form <command> =
              <value>, where command is the same as that specified on the command  line,  without
              the '-' character, and value is the value given to the setting.

       ~/.stella/atarivox_eeprom.dat
              Default storage for the emulated EEPROM portion of an attached AtariVox device.

       ~/.stella/savekey_eeprom.dat
              Default storage for the emulated EEPROM portion of an attached SaveKey device.

       ~/.stella/stella.cht
              Default location of the cheat database file.

SEE ALSO

       /usr/share/doc/stella/index.html, /usr/share/doc/stella/debugger.html.

AUTHORS

       stella was written by Bradford W. Mott, Stephen Anthony and the Stella Team.

       This   manual   page   was  adapted  from  the  provided  documentation  by  Stephen  Kitt
       <steve@sk2.org>, for the Debian GNU/Linux system (but may be used by others). It was  last
       modified for stella version 3.4.1.