gngb - emulate various Nintendo Game Boy handheld systems

Author

       This manual page was written by RCU <nemesis@dbz.icequake.net>, for the Debian GNU/Linux system (but  may
       be used by others).

                                                                                                         GNGB(1)

Default Bindings

       These are the default keys in the emulator.  These, along with  the  joystick  buttons,  may  be  changed
       through a custom gngbrc(5) file.

       Enter          : Start
       Right Shift    : Select
       W              : B
       X              : A
       TAB            : Open menu

       F9             : fullscreen on/off
       F10            : show fps
       F11            : reset
       F12            : show keysym code

       KeyPad 1-5: Change palette
              Palette must be define in your gngbrc file (see sample_gngbrc)

       KeyPad 6  : Toggle color filter

Description

gngb  is an emulator program that attempts to be various forms of Nintendo Game Boy hardware.  It can run
       the various homebrew games and demos for the system as well as images of commercially-released games.

       This manual page was written for the Debian GNU/Linux distribution because the original program does  not
       have a manual page.

Name

       gngb - emulate various Nintendo Game Boy handheld systems

Options

The program follows the usual GNU command line syntax, with long options starting with two dashes (`-').
A summary of options are included below.

-h,--help
print help and exit

-a,--autoframeskip
turn on autoframeskip. This is useful if the emulator is running too slow. It will cause the
emulator to drop frames every now and then to maintain a realtime emulation.

--sleep_idle
sleep when idle. This will cause the program to sleep when it has idle cycles instead of busy
looping. However, this can degrade emulation performance under some circumstances.

--color_filter
turn on the color filter.

-r,--rumble
turn on the rumble simulation. This will cause the emulated screen to shake when a rumble effect
is caused by the running program.

--filter=X
Set the filter to apply. These only work when using standard (not YUV or GL) video output. 0 =
none 1 = scanline 2 = scanline 50% 3 = smooth 4 = pseudo cell shading

-R,--res=WxH
set the screen resolution to WxH (for YUV and GL mode only).

-Y,--yuv
turn YUV mode on. This utilizes the hardware YUV colorspace conversion and scaling features if
your video card supports it. Most video cards with Xv support can use this feature for excellent
performance.

--yuv_type
set the type of the YUV overlay: 0 = YV12 1 = YUY2

-o,--opengl
turn OpenGL mode on. This will render the gameboy screen as an OpenGL 3D texture, which on some
cards may perform much better than the YUV or X11 output. This requires a 3D card with GLX
support.

-f,--fullscreen
run gngb in fullscreen. Fullscreen can be toggled during use with F9.

--fps Show frames per second counter in the upper left corner of screen. May be toggled through the
emulator's menu.

-s,--sound
Enable sound.

--sample_rate=RATE
Set the sound output sample rate to RATE. (typically a multiple of 11025 Hz)

--auto_gb
Automatically detect the system to emulate based on the cartridge image that is selected. This
should work in most cases. If it fails, you can use one of the [ -C,--color_gb | -G,--normal_gb
| -S,--super_gb ] options to force emulation of a Color, Normal, or Super Game Boy.

-j,--joy_dev=N
The default joystick is /dev/js0. By setting N here, /dev/jsN will be used in its place.

-g,--gdma_cycle
This experimental option will halt the CPU during certain DMA operations. Leave it off unless you
are working around problems in a certain program.

-v,--version
Show version of program.

Most options can be disabled with --no-OPTION (Ex: --no-sound turn sound off)