faq.txt

linux下的任天堂模拟器代码。供大家参考。

   MMX support.

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             Sound
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Q: Why does ZSNES produce a lot of static?
A: There could be many reasons why you are hearing static. If you are using the
   Windows port and you have an ISA sound card, this could be your problem. If
   you are using the DOS port, and you have a PCI sound card, this could also be
   your problem. If your sound card is using SoundBlaster emulation, you
   probably need to use 8-bit sound, but this can make sound output worse. You
   can also try doing the following things to improve your sound: Reduce your
   sampling rate or disable lowpass filtering and stereo sound; Win port users
   can also enable the Primary Sound Buffer.

Q: Why am I missing some sound options?
A: Please make sure you have MMX Support enabled in the Options dialog. Refer to
   the Sound Config description in [GUI.txt] to see what sound options require
   MMX support.

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             Input
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Q: Why can't I press more than two keys at a time?
A: Many PC ("Personal Computer") keyboards limit the number of key signals that
   can be transmitted simultaneously. For example, certain combinations of three
   or more alphanumeric keys may not work. Conversely, there may be some
   combinations of three or more keys that *do* work. You would just have to
   test by trial-and-error to find out, since these combinations can vary
   between keyboards. Joysticks and gamepads generally don't have this
   limitation.

   If you must use a keyboard, you can set multiple game keys to a single
   keyboard key. Alternatively, you could set some keys to the right and left
   Ctrl and Shift keys, since most keyboards do not restrict signals from
   these keys.

Q: Why is one direction of the d-pad always held down, even when I'm not
   pressing any keys?
A: ZSNES auto-calibrates any connected gamepads/joysticks when it first starts.
   Thus, if one of the buttons or directions is accidentally held down while
   ZSNES is starting, ZSNES will think this is "normal" or "zero" input, even
   when you let go of the button. To fix the problem, simply close ZSNES, make
   sure no buttons are pressed and all axis are centered on your
   gamepad/joystick, and restart ZSNES. It will then auto-calibrate to the
   correct "zero" settings.

Q: How do I use both my keyboard and joystick for the 1st or 2nd player?
A: First, configure the Player 1 pad (Config-->Input--> #1) for your normal
   set-up (for example, a keyboard). Next, configure the Player 3 pad
   (Config-->Input--> #3) to use your alternative set-up (for example, a
   joystick or gamepad). When you want to switch between your regular and
   alternative set-up, go to the Config-->Options menu and check
   USE PL3/4 AS PL1/2. Now the Player 3 controls act as the Player 1 pad, and
   Player 4's controls act as the Player 2 pad. To return to the normal
   controls, simply uncheck this option. Follow the same procedure to create a
   similar set-up for Players 2 and 4.
   Note: Enabling the option USE PL3/4 AS PL1/2 disables MultiTap emulation.

Q: Why can't I set the keys/buttons for Player 2?
A: You need to set the Current Device before ZSNES will allow you to set the
   individual keys for Player 2 (or Players 3, 4, or 5). If NONE is shown after
   CURRENT:, the input cannot be changed (or used, for that matter). See the
   Input section of the GUI page [GUI.txt] for further instructions.

Q: Why won't ZSNES accept input when I'm configuring the keys for my gamepad?
A: Exit ZSNES and calibrate your input device. Then restart ZSNES and see if it
   works.

Q: This game tells me that it is not compatible with the MultiTap (or an
   external device attached). What should I do?
A: Set the input devices of player 3, 4, and 5 to "None". You may also need to
   go to Config-->Options, and enable "Use Player 3/4 as Player 1/2".
   Additionally, you could add an NSRT header to your ROM if you desire.

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             Speed
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Q: Why is ZSNES slow?
A: First and foremost, does your computer meet the minimum system requirements
   to run ZSNES? If not, there is little you can do to improve performance. That
   being said, you can still try a number of things.

     * Make sure that any major program(s) is/are closed (such as Winamp).
     * Try the default settings of ZSNES before you do anything else. You can
       reset ZSNES to the default settings by deleting all three of its
       configuration files.
     * Ensure that MMX Support is enabled in the Options dialog; this mode
       should provide a noticeable speed increase for computers that can use it.
     * Certain system configurations and video cards work better with certain
       video modes. Try switching between different video modes until you find
       one that has good/better performance. Things to remember when doing this
       are that lower resolutions are faster than higher resolutions, full
       screen modes are faster than windowed modes, and 'R' modes are faster
       than 'S' modes (because no scaling is necessary).
     * Make sure you are using Auto Frame Skipping. If you already are, try
       increasing the Max Frame Skip.
     * Do not use VSync; if you must use VSync, try also enabling Triple
       Buffering.
     * Disable all video filters.
     * Compile ZSNES yourself with optimizations for your CPU's architecture.
     * If you still need more speed, disable sound. If that's not enough,
       disable SPC emulation (you must restart ZSNES for this option to take
       effect). Some games will not work without SPC emulation.

   If you have an old computer, such as one with a 486/100 processor, you will
   probably be better off using older DOS versions of ZSNES, as the minimum
   system requirements have increased slightly with subsequent releases. To
   achieve greater speed, you may want to avoid using VESA video modes (although
   this will disable transparencies). Experiment with the different video modes
   and try the recommendations above to see which configuration provides the
   best speed for you.

Q: Why does the game slow down even though I'm using auto frame rate and the FPS
   is pretty high?
A: If you have ever played a real SNES, you may notice that some games slow down
   even on it. To the extent that ZSNES accurately emulates an SNES, a game will
   slow down in ZSNES in the same places it would slown down on a real SNES.

Q: My games are running too quickly! How do I slow them down?
A: You may have disabled auto frame skipping. Re-enable it in the
   Config-->Speed menu.

   If you don't want to use auto frame skipping, and you want to play in
   windowed mode, you might want to set your monitor's refresh rate to 60hz
   and enable VSync in ZSNES.

   If you want to use fullscreen mode without using auto frame skipping,
   you can enable the KitchenSync by using either the -ks (for NTSC/PAL)
   or -kp (for PAL) command-line parameter (Windows port only) [Advanced.txt].
   Also be sure to enable triple buffering.

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         Miscellaneous
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Q: Does ZSNES support loading ROMs which are compressed?
A: Yes, but it depends on what compression format is used. ZSNES can currently
   load ROMs that are compressed in the ZIP (method 0 - store and method 8 -
   deflate), GZip, and JMA compression formats.

   Many tools are available to create ZIP files. If you want a fast, commandline
   based ZIP program that is available on many platforms, get Info-ZIP. Info-ZIP
   also has a Windows front end called WiZ available if you prefer a GUI.

   For creating GZip files, there are not too many choices. A fast, commandline
   based compressor for the GZip format, available for several platforms, may be
   downloaded at the GZip site [http://www.gzip.org]. If you use Windows, there
   is a program with a GUI called 7-Zip [http://www.7-zip.org] that has support
   for ZIP, GZip, and others. ZIP and GZip files created by 7-Zip are smaller
   than those created with other programs, but 7-Zip takes a longer time
   creating them. For users of Unix based operating systems who would like a GUI
   front end for both ZIP and GZip, get Ark
   [http://docs.kde.org/en/3.2/kdeutils/ark/], which is part of the KDE project.

   To create JMA files, a format invented by Nach and the rest of the NSRT team
   which offers the best compression ratio for SNES ROMs, you must use NSRT
   [http://nsrt.edgeemu.com]. NSRT is also capable of compressing SNES ROMs into
   ZIP and GZip formats.

Q: Why doesn't ZSNES support the 7z, RAR, or ZIP deflate64 compression formats?
A: ZSNES only supports formats which have an open-source, portable, and
   easy-to-use library. The 7z and RAR formats do not yet have libraries that
   fill those criteria. If you want the best compression ratio for your SNES
   ROMs, you should use JMA. Currently, the only publicly available program that
   can compress and decompress with JMA is NSRT [http://nsrt.edgeemu.com]. ZIP
   deflate64 lacks a decompression library which ZSNES can use, but rumor has it
   that Nach is working on one.

Q: Does ZSNES support multiple ROMs in a single ZIP or JMA file?
A: ZSNES currently does not support more than one ROM in a ZIP or JMA file,
   although such support will probably be implemented in the future.

Q: Can you make a Mac/PocketPC/PS2/whatever port?
A: Since ZSNES is written in assembly, ports to any systems that are not 100%
   x86 compatible are impossible. Try Snes9x [http://www.snes9x.com] for
   portability.

   Apple Computer, Inc. recently switched the Macintosh computers to use Intel
   processors [http://www.apple.com/pr/library/2005/jun/06intel.html], and
   as such ZSNES has already been modified to run on said computers. Just
   compile the SDL port with an up-to-date NASM and zlib and everything normally
   required.

   Another third party developer recently ported ZSNES to the Microsoft Xbox as
   well, and released it under the name "ZsneXbox". Unfortunately, we can not
   provide a download link as this port is being illegally distributed as a
   compiled XBE file. As a result, any link or support requests regarding this
   port will be promptly ignored.


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  2.               WIN-SPECIFIC QUESTIONS
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            General
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Q: Why does ZSNESw crash and give me an error with dinput.dll?
A: If you get this error, download and install the latest version of DirectX.
   You might also try running the DirectX Diagnostic Tool. You can do this by
   clicking the Start button, then selecting "Run...". Type "dxdiag" after
   "Open:", and click "OK". There are lots of options you can play with, so
   please read everything before you start messing around. Specifically, go to
   the "Display" tab, and under the "DirectX Features" section, click the
   "Disable" button beside each feature. After they are all disabled, re-enable
   them. Exit dxdiag, and try ZSNES again.

   If none of that worked, try re-installing DirectX.

Q: I just switched from the DOS port to the Windows port of ZSNES; why don't my
   savestates work? Are they incompatible?
A: The saves and savestates will work just as well with any port of ZSNES. You
   simply need to rename all files that have .srm and .zst (and .zs1, .zs2,
   etc.) extensions to match the filenames of your ROMs (or the jma/zip archives
   that contain them).

   For example, if you have "Super Mario World.zip" and "Super Mario RPG.zip",
   both games will have saves that are labeled "SUPERM~1.SRM", "SUPERM~1.ZS2",
   etc., and they will be differentiated only by the number after the "~" in the
   filename.

   If you need to find out which "~" number a game uses, open a DOS prompt
   (a.k.a. Command Prompt), change to the ROM directory, and enter "dir /on /p"
   (On some newer systems like Win2k you need to add the "/x" switch for the DOS
   filenames to be displayed). Unfortunately, this method may not be accurate if
   you have moved your ROMs to a different folder or another computer; you may
   need to guess and hope for the best, trying to swap filenames a few different
   ways between the saves before it works for all your games. If it comes down
   to guessing, we recommend that you backup your save files before renaming
   them.

   Don't forget to put the files into your Save directory. A question concerning
   the Save directory is under Universal Questions -> General [FAQ.txt].

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             Video
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Q: Why am I seeing double, with strange colors?
A: Any change of resolution within ZSNES should correct the problem. Fullscreen
   modes are recommended because they are faster than windowed modes.

   If you still experience problems, see if these suggestions help (each should
   be done/tried separately):
     - The issue can be completely resolved with up-to-date video card drivers.