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+
+GNUBOY README
+
+
+  INTRO
+
+Welcome to gnuboy, one of the few pieces of Free Software to emulate
+the Game Boy handheld game console. Written in ANSI C with a few
+optional assembler optimizations for particular cpus, gnuboy supports
+a wide range of host systems, and has been tested successfully on:
+
+  GNU/Linux
+  FreeBSD
+  OpenBSD
+  BeOS
+  Linux/390 (IBM S/390 Mainframe)
+  SunOS/Sun Ultra60
+  IRIX/SGI O2
+  IRIX/SGI Indy
+  AIX/Unknown
+  DR-DOS
+  MS-DOS
+  Windows DOS box
+  Windows 9x/NT/2k
+
+Additionally, gnuboy should run on any other *nix variants that have
+ANSI C compilers and that are remotely POSIX compliant. As gnuboy is
+Free Software, you're welcome to fix any problems you encounter
+building it for a particular system, or to port it to entirely new
+systems.
+
+
+  EMULATION
+
+gnuboy emulates nearly all aspects of the (Color) Gameboy, including
+all of the following and much more:
+
+  Full GBZ80 instruction set.
+  Scanline-based LCD engine.
+  Ten sprites per scanline limit.
+  Support for all CGB graphics extensions.
+  Sprite DMA, HDMA, and GDMA.
+  All four sound channels including digital samples.
+  MBC1, MBC2, MBC3 (including clock), and MBC5 mappers.
+  Wave pattern memory corruption when sound channel 3 is played.
+  Pad, timer, divide counter, and other basic hardware registers.
+  CGB double-speed CPU mode.
+
+Aspects not emulated at this time include:
+
+* Serial IO (link cable).
+  Undocumented 'extra' ram in OAM space on Gameboy Color.
+  All Super Gameboy extensions.
+* GBC, HuC1, and HuC3 IR ports.
+* Obscure mappers such as TAMA5.
+  Sorting sprites by X coordinate in DMG mode.
+  HALT instruction skipping in DMG mode.
+  CPU stalls during HDMA and GDMA.
+
+Only the two marked by * are known to affect the playability of
+actual games or demos; the rest are just listed for completeness'
+sake.
+
+
+  FEATURES
+
+In addition to basic emulation, gnuboy provides the following
+features:
+
+  Highly flexible keybinding and configuration subsystem.
+  State saving and loading at any point.
+  Very precise timing/synchronization, preserved across save/load.
+  Joystick support on Linux, DOS, and all SDL-based ports.
+  Fully customizable palettes for DMG games.
+  Screen scaling by a factor of 2, 3, or 4 in all ports.
+  Hardware-based screen scaling on platforms where it's available.
+  Debug traces to stdout.
+  Dynamic palette allocation when run in 256-color modes...
+  OR simulated 3/3/2 bits per channel in 256-color modes.
+
+For information on configuring and using these features, see the
+additional documentation in the "docs" directory.
+
+
+  COMPATIBILITY
+
+Out of over 300 results reported by testers, all games are known to
+work perfectly on gnuboy with the following exceptions:
+
+  Fighting Phoenix (Japanese) may or may not work since it uses the
+  HuC1 memory controller, which is not implemented properly. There has
+  been no report either way so far.
+
+  Pocket Bomberman (Japanese version, which uses HuC1) runs, but can
+  be made to crash if the player jumps into the ceiling in the first
+  level. It's not clear whether this bug is MBC-related, something
+  else, or an actual bug in the original game.
+
+  Monster Go! Go! Go! (Japanese) is unplayable. The cause of the
+  problem is not fully known, but it's either a very bad dump or it's
+  using some sort of specialized MBC that's not documented.
+
+  Final Fantasy Adventure has visual problems with the fade between
+  screens. Does not affect gameplay.
+
+  Bubble Bobble 2 has some minor tile glitches right before gameplay
+  actually begins. Cause unknown. Does not affect gameplay.
+
+  Alone in the Dark is reported to have minor visual glitches. I
+  haven't seen it myself so I can't judge their severity.
+
+  Both new Zelda games are reported to have a visual glitch at the
+  beginning of the game, and on certain other screens. I haven't seen
+  the problem myself, but supposedly it impacts gameplay to some
+  extent.
+
+Please report any other incompatibilities discovered directly to
+gnuboy@unix-fu.org, so that they can be documented and hopefully
+fixed.
+
+
+  FUTURE / WISHLIST
+
+Here's a brief list of what may appear in gnuboy in the future:
+
+  Screenshots.
+  Integrated debugger.
+  Super Gameboy support.
+  Serial link over the internet.
+  Serial link to a real Gameboy with a custom cable.
+  Configurable color filters to provide more authentic LCD look.
+  Custom colorization of DMG games on a per-tile basis.
+  Support for more colorspaces in the hardware scaler.
+  Recording audio.
+  GBS player built from the same source tree.
+  Full recording and playback of emulation.
+  So-called "high level emulation" of certain typical dumb loops.
+
+Features that are not likely to appear soon or at all include:
+
+  Rumble support - this would be nice, but SDL doesn't seem to support
+  force-feedback yet. We'll see about it in the long-term though.
+
+  Eagle/2xSaI/etc. - probably not feasible since these libraries don't
+  appear to be compatible with the terms of the GPL. We might work on
+  our own interpolation engine eventually, but that's low priority.
+
+  GUI/GUI-like features - such things are best handled by external
+  front-ends. We might eventually add a mechanism for external
+  programs to communicate with gnuboy and reconfigure it while it's
+  running, however.
+
+  Plugins - NO! The way I see it, plugins are just an attempt to work
+  around the GPL. In any case, even if you are adding plugin support
+  yourself, you are bound by the terms of the GPL when linking ANY
+  code to gnuboy, including dynamic-linked modules. However we'd
+  rather not deal with this mess to begin with.
+
+  Compressed ROMs/Saves - this one is very iffy. On most systems, this
+  is redundant; *nix users can just pipe the rom through a
+  decompression program, and Windows users can just double-click or
+  drag files from their favorite GUI unzipper program. Linking to zlib
+  isn't really acceptable since it's massively bloated and we don't
+  want to include it with gnuboy or add external dependencies. We may,
+  however, write our own tiny decompressor to use at some point.
+
+Ideas and suggestions for other features are welcome, but won't
+necessarily be used. You're of course also free to add features
+yourself, and if they fit well into the main tree they may eventually
+get included in the official release. See the file HACKING for more
+details on modifying and/or contributing.
+
+
+  THANKS
+
+Thanks goes out to everyone who's expressed interest in gnuboy by
+writing -- users, porters, authors of other emulators, and so forth.
+Apologies if we don't get a personal response out to everyone, but
+either way, consider your feedback appreciated.
+
+
+  EPILOGUE
+
+OK, that looks like about it. More to come, stick around...
+
+
+
+                                          -Laguna  <laguna@aerifal.cx>
+
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