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git-svn-id: file:///home/notaz/opt/svn/PicoDrive/platform@2 be3aeb3a-fb24-0410-a615-afba39da0efa
138 lines
5.2 KiB
Text
138 lines
5.2 KiB
Text
As PicoDrive is multiplatform emulator, this is GP2X specific part of readme
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about configuration.
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Configuration
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-------------
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1. "Renderer"
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8bit fast:
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This enables alternative heavily optimized tile-based renderer, which renders
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pixels not line-by-line (this is what accurate renderers do), but in 8x8 tiles,
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which is much faster. But because of the way it works it can't render any
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mid-frame image changes (raster effects), so it is useful only with some games.
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Other two are accurate line-based renderers. The 8bit is faster but does not
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run well with some games like Street Racer.
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2. "Accurate timing"
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This adds some more emulation precision, but slows the emulation down. Whithout
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this option some games do not boot (Red Zone for example), others have sound
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problems.
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3. "Accurate sprites"
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This option improves emulation of sprite priorities, it also enables emulation
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of sprite collision bit. If you see one sprite being drawn incorrectly above
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the other (often seen in Sonic 3D Blast), you can enable this to fix the problem.
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This only works with the default renderer (see first option).
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4. "Show FPS"
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Self-explanatory. Format is XX/YY, where XX is the number of rendered frames and
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YY is the number of emulated frames per second.
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5. "Frameskip"
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How many frames to skip rendering before displaying another.
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"Auto" is recommended.
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6. "Enable sound"
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Does what it says. You must enable at least YM2612 or SN76496 (in advanced options,
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see below) for this to make sense.
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7. "Sound Quality"
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Sound rate and stereo mode. If you want 44100Hz sound, it is recommended to enable
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the second core (next option).
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8. "Use ARM940 core for sound"
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This option causes PicoDrive to use ARM940T core (GP2X's second CPU) for sound
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(i.e. to generate YM2612 samples) to improve performance noticeably.
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9. "6 button pad"
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If you enable this, games will think that 6 button gamepad is connected. If you
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go and reconfigure your keys, you will be able to bind X,Y,Z and mode actions.
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10. "Genesis Region"
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This option lets you force the game to think it is running on machine from the
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specified region.
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11. "Use SRAM savestates"
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This will automatically read/write SRAM savestates for games which are using them.
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SRAM is saved whenever you pause your game or exit the emulator.
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12. "GP2X CPU clocks"
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Here you can change clocks of both GP2X's CPUs. Larger values increase performance.
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There is no separate option for the second CPU because both CPUs use the same clock
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source. Setting this option to 200 will cause PicoDrive NOT to change GP2X's clocks
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at all.
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13. "[advanced options]"
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Enters advanced options menu (see below).
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14. "Save cfg as default"
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If you save your config here it will be loaded on next ROM load, but only if there
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is no game specific config saved (which will be loaded in that case).
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15. "Save cfg for current game only"
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Whenever you load current ROM again these settings will be loaded (squidgehack and
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RAM settings will not take effect until emulator is restarted).
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Advanced configuration
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----------------------
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Enter [advanced options] in config menu to see these options.
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1. "Scale 32 column mode"
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This enables hardware scaling for lower-res genesis mode (where width is
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32 8-pixel tiles, instead of 40 in other mode).
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2. "Gamma correction"
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Alters image gamma through GP2X hardware. Larger values make image to look brighter,
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lower - darker (default is 1.0).
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3. "Emulate Z80"
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Enables emulation of Z80 chip, which was mostly used to drive the other sound chips.
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Some games do complex sync with it, so you must enable it even if you don't use
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sound to be able to play them.
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4. "Emulate YM2612 (FM)"
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This enables emulation of six-channel FM sound synthesizer chip, which was used to
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produce sound effects and music.
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5. "Emulate SN76496 (PSG)"
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This enables emulation of additional sound chip for additional effects.
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Note: if you change sound settings AFTER loading a ROM, you may need to reset
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game to get sound. This is because most games initialize sound chips on
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startup, and this data is lost when sound chips are being enabled/disabled.
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6. "gzip savestates"
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This will always apply gzip compression on your savestates, allowing you to
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save some space and load/save time.
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7. "USB joy controls player X"
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If you are able to use USB joysticks with your GP2X, this options selects which
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player the joystick controls.
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8. "Don't save config on exit"
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This will disable config autowrite on exit (which might cause SD card corruption
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according to DaveC).
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9. "craigix's RAM timings"
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This overclocks the GP2X RAM chips, but may cause instability. Recommended if you
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use the second core for sound. Needs emulator restart to take effect.
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See this thread:
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http://www.gp32x.com/board/index.php?showtopic=32319
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10. "squidgehack"
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Well known way to improve the GP2X performance. You must restart the emulator
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for the change of this option to take effect.
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Key configuration
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-----------------
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When you select "Configure controls" from the menu, you enter a key configuration
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mode, where you use SELECT to change an action, and then press a key you like to
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bind to that action. You can press the same key again to unbind. Select "DONE"
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action and press any key to finish.
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