1 For help / comments / questions visit GP32X boards at:
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2 http://www.gp32x.com/board/
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8 This is yet another Megadrive / Genesis / Sega CD / Mega CD emulator, which
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9 was written having ARM-based handheld devices in mind (such as PDAs,
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10 smartphones and handheld consoles like GP2X of course). The critical parts
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11 (renderer, 68K and Z80 cpu interpreters) and some other random code is
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12 written in ARM asm, other code is C. The base code originates from Dave's
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13 (fdave, finalburn) PicoDrive 0.30 for Pocket PC. The Sega/Mega CD code is
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14 roughly based on Stephane Dallongeville's Gens.
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20 Copy PicoDrive.gpe, code940.bin and mmuhack.o to any place in your filesystem
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21 (all 3 files must be in the same directory) and run PicoDrive.gpe.
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22 Then load a ROM and enjoy! ROMs can be in .smd or .bin format and can be zipped.
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24 If you have any problems (game does not boot, sound is glitchy, broken graphics),
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25 make sure you enable "Accurate timing", "Emulate Z80" and then disable
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26 "Fast renderer". This way you will get the best compatibility this emulator can
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30 How to run Sega/Mega CD games
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31 -----------------------------
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33 To play any game, you need BIOS files. These files must be copied to the same
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34 directory as PicoDrive.gpe. Files can be named as follows:
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35 US: us_scd1_9210.bin us_scd2_9306.bin SegaCDBIOS9303.bin
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36 EU: eu_mcd1_9210.bin eu_mcd2_9303.bin eu_mcd2_9306.bin
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37 JP: jp_mcd1_9112.bin jp_mcd1_9111.bin
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38 these files can also be zipped.
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40 The game must be dumped to ISO format, but BIN can be used too. If you want
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41 CD music, you must use ISO+mp3 files. Audio from BIN files won't be read at
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42 all due to SD access issues. Also BIN files are usually larger, so it's better
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43 to use ISO. ISO+mp3 files can be named similarly as for other emus.
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44 Here are some examples:
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46 SonicCD.iso data track
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47 SonicCD_02.mp3 audio track 1 (CD track 2)
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51 Sonic the Hedgehog CD (US) - Track 01.iso
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52 Sonic the Hedgehog CD (US) - Track 02.mp3
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53 Sonic the Hedgehog CD (US) - Track 03.mp3
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56 ISO files can also be zipped (but not mp3 files, as they are already
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57 compressed). Note that this can cause very long loading times, which may
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58 take up to several minutes. File naming is similar as with uncompressed ISOs.
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61 SonicCD.zip data track
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62 SonicCD_02.mp3 audio track 1 (CD track 2)
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70 See config.txt file.
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73 Other important stuff
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74 ---------------------
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76 * When you use both GP2X CPUs, keep in mind that you can't overclock as high as
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77 when using ARM920 only. For example my GP2X when run singlecore can reach
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78 280MHz, but with both cores it's about 250MHz. When overclocked too much,
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79 it may start hanging and producing random noise.
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80 * PicoDrive is not a mp3 player, so all mp3s MUST be encoded at 44.1kHz stereo.
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81 Otherwise mp3s will play too fast or too slow.
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82 * Due to internal implementation mp3s must not be larger that ~15MB
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83 (15548416 bytes). Larger mp3s will not be fully loaded.
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84 * Use lower bitrate for better performance (96 or 128kbps CBRs recommended).
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85 * RAM timings option is good for dualcore operation (it is disabled by
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86 default because it doesn't work on every GP2X, so enable it in advanced
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93 To use GG/patch codes, you must type them into your favorite text editor, one
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94 per line. Comments may follow code after a whitespace. Only GameGenie and
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95 Genecyst patch formats are supported.
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98 Genecyst patch (this example is for Sonic):
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100 00334A:0005 Start with five lives
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101 012D24:0001 Keep invincibility until end of stage
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102 009C76:5478 each ring worth 2
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103 009C76:5678 each ring worth 3
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106 Game Genie patch (for Sonic 2):
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108 ACLA-ATD4 Hidden palace instead of death egg in level select
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111 Both GG and patch codes can be mixed in one file.
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113 When the file is ready, name it just like your ROM file, but with additional
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114 .pat extension, making sure that case matches.
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119 PATCH FILE: Sonic.zip.pat
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122 PATCH FILE: Sonic 2.bin.pat
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124 Put the file into your ROMs directory. Then load the .pat file as you would
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125 a ROM. Then Cheat Menu Option should appear in main menu.
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132 main 68k @ 7.6MHz: yes, Cyclone core
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133 z80 @ 3.6MHz: yes, DrZ80 core
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134 VDP: yes, except some quirks not used by games
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135 YM2612 FM: yes, optimized MAME core
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136 SN76489 PSG: yes, MAME core
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139 another 68k @ 12.5MHz: yes, Cyclone too
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140 gfx scaling/rotation chip (custom ASIC): not yet (faked only)
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141 PCM sound source: yes
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142 CD-ROM controller: yes (mostly)
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143 bram (internal backup RAM): yes
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146 Problems / limitations
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147 ----------------------
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149 * 32x and SVP are not emulated.
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150 * Various VDP quirks (window bug, scroll size 2, etc.) are not emulated,
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151 as very few games use this (if any at all).
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152 * Some games don't work or have glitches because of inaccurate timing and sync
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153 between the emulated chips.
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159 This emulator uses code from these people/projects:
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162 Cyclone 68000 core, Pico emulation library
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163 Homepage: http://www.finalburn.com/
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166 GP2X port, Cyclone 68000 hacks, lots of additional coding (see changelog).
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169 DrZ80, the Z80 emulator written in ARM assembly.
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170 Homepage: http://reesy.gp32x.de/
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172 Tatsuyuki Satoh, Jarek Burczynski, MultiArcadeMachineEmulator development
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173 software implementation of Yamaha FM sound generator
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175 MultiArcadeMachineEmulator (MAME) development
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176 Texas Instruments SN76489 / SN76496 programmable tone /noise generator
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177 Homepage: http://www.mame.net/
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179 Stephane Dallongeville
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180 Gens, MD/Mega CD/32X emulator. Most Sega CD code is based on this emu.
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189 * Charles MacDonald (http://cgfm2.emuviews.com/) for old but still very useful
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190 info about genesis hardware.
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191 * Steve Snake for all that he has done for Genesis emulation scene.
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192 * Bart Trzynadlowski for his SSFII and 68000 docs.
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193 * Haze for his research (http://haze.mameworld.info).
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194 * Mark and Jean-loup for zlib library.
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195 * Anyone else I forgot. You know who you are.
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198 * rlyeh and all the other people behind the minimal library.
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199 * Squidge for his famous squidgehack(tm).
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200 * Dzz for his ARM940 sample code.
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201 * GnoStiC & Puck2099 for USB joystick support.
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202 * Hermes PS2R, god_at_hell for the CpuCtrl library.
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203 * craigix for supplying the GP2X hardware and making this port possible.
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206 * Peter van Sebille for his various open-source Symbian projects to learn from.
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207 * Steve Fischer for his open-source Motorola projects.
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208 * The development team behind "Symbian GCC Improvement Project"
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209 (http://www.inf.u-szeged.hu/symbian-gcc/) for their updated pre-SymbianOS9
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211 * AnotherGuest for all his Symbian stuff and support.
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212 * Inder for the icons.
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218 + ISO files now can be zipped. Note that this causes VERY long loading times.
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219 + Added data pre-buffering support, this allows to reduce frequency of short pauses
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220 in FMV games (caused by SD access), but makes those pauses longer.
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221 * Fixed PCM DMA transfers (intro FMV in Popful Mail).
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222 + Properly implemented "decode" data transformation (Jaguar XJ220).
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223 * Integrated "better sync" code into cyclone code, what made this mode much faster.
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224 * Fixed a bug related to game specific config saving.
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225 * Frameskipper was skipping sound processing, what caused some audio desyncs. Fixed.
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226 * Fixed reset not working for some games.
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227 + New assembly optimized memory handlers for CD (gives at least a few fps).
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228 Also re-enabled all optimizations from 0.964 release.
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229 + New idle-loop detection code for sub-68k. Speeds up at least a few games.
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232 + Added basic cheat support (GameGenie and Genecyst patches).
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235 * Fixed a long-standing problem in audio mixing code which caused slight distortions
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236 at lower sample rates.
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237 * Changed the way 920 and 940 communicates (again), should be more reliable and give
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238 slight performance increase.
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239 * Some optimizations in audio mixing code.
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240 * Some menu changes (background added, smaller font in ROM browser, savestate loader
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241 now can select slots).
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242 + 1M mode DMA transfers implemented (used by FMV games like Night Trap and Sewer Shark).
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243 + Games now can run code from WORD RAM in 1M mode (fixes Adventures of Willy Beamish).
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244 + "Cell arrange" address mapping is now emulated (Heart of the alien).
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245 + "Color numeric operation" is now emulated (text in Lunar 2, Silpheed intro graphics).
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246 + "Better sync" option added (prevents some games from hanging).
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249 + Region autodetection now can be customized.
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250 * When CDDA music tracks changed, old buffer contents were incorrectly played. Fixed.
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251 * BRAM is now automatically formatted (no need to enter BIOS menu and format any more).
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252 * Games now can be reset, CDDA music no longer breaks after loading another ISO.
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253 * Fixed a race condition between 920 and 940 which sometimes caused CDDA music not to play.
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254 + Savestates implemented for Sega/Mega CD.
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256 * Some mixer code rewritten in asm. 22kHz and 11kHz sound rates are now supported in
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257 Mega CD mode (but mp3s must still be 44kHz stereo).
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258 + Timer emulation added.
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259 * CDC DMA tansfers fixed. Snatcher and probably some more games now boot.
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260 * 2M word RAM -> VDP transfers fixed, no more corruption in Ecco and some other games.
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263 + GP2X: Added experimental Sega CD support.
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264 + GP2X: Added partial gmv movie playback support.
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267 * GP2X: Fixed a sound buffer underflow issue on lower sample rate modes, which was
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268 happening for NTSC games and causing sound clicks.
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269 * GP2X: Redone key config to better support USB joysticks (now multiple joysticks
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270 should be useable and configurable).
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271 + GP2X: Added save confirmation option.
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272 + GP2X: Added 940 CPU crash detection.
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273 + ALL: UIQ3 port added.
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276 * GP2X: Gamma-reset-on-entering-menu bug fixed.
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277 * GP2X: Recompiled PicoDrive with gcc profiling option set as described here:
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278 http://www.gp32x.com/board/index.php?showtopic=28490
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281 * GP2X: Fixed an issue with incorrect sounds in some games when dualcore operation
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282 was enabled (for example punch sound in SOR).
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283 * GP2X: Limited max volume to 90, because higher values often cause distortions.
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284 * GP2X: Fixed a bug with lower res scaling.
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285 * GP2X: Gamma is now reset on exit.
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288 * ALL: Severely optimized MAME's YM2612 core, part of it is now rewritten in asm.
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289 + GP2X: The YM2612's code now can be run in GP2X's ARM940T CPU, what causes large
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290 performance increase.
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291 * ALL: Accurate renderers are slightly faster now.
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292 + GP2X: Using quadruple buffering instead of doublebuffer now, also updated
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293 framelimitter, this should eliminate some scrolling and tearing problems.
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294 * GP2X: Fixed some flickering issues of 8bit accurate renderer.
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295 + GP2X: craigix's RAM timings now can be enabled in the menu (see advanced options).
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296 + GP2X: Added ability to save config for specific games only.
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297 + GP2X: Gamma control added (using GP2X's hardware capabilities for this).
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298 * GP2X: Volume keys are now configurable.
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299 + GP2X: GnoStiC added USB joystick support, I made it possible to use it for
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300 player 2 control (currently untested).
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301 * GP2X: squidgehack is now applied through kernel module (cleaner way).
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304 * ALL: Fixed a bug in sprite renderer which was causing slowdowns for some games.
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305 + GP2X: Added command line support
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306 + GP2X: Added optional hardware scaling for lower-res games like Shining Force.
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307 * ALL: Sound chips are now sampled 2 times per frame. This fixed some games which
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308 had missing sounds (Vectorman 2 1st level, Thunder Force 3 water level,
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310 + ALL: Added another accurate 8-bit renderer which is slightly faster and made it
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314 + GP2X: Added frame limiter for frameskipped modes.
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315 * GP2X: Increased brightness a bit (unused pixel bits now also contain data).
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316 * GP2X: Suidgehack was not applied correctly (was applied before allocating some
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317 high memory and had no effect).
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321 * Improved interrupt timing, Mazin Saga and Burning Force now works.
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322 * Rewritten renderer code to better suit GP2X, should be faster on other
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324 + Added support for banking used by 12-in-1 and 4-in-1 ROMs (thanks Haze).
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325 + Added some protection device faking, used by some unlicensed games like
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326 Super Bubble Bobble, King of Fighters, Elf Wor, ... (thanks to Haze again)
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327 + Added primitive Virtua Racing SVP faking, so menus can be seen now.
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330 * Fixed a problem with P900/P910 key configuration in FC mode.
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331 * Improved shadow/hilight mode emulation. Still not perfect, but should be
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332 enough for most games.
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333 + Save state slots added.
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334 + Region selector added.
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338 * VDP emulation is now more accurate (fixes flickering in Chase HQ II,
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339 Super Hang-On and some other problems in other games).
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340 * HV counter emulation is now much more accurate. Fixes the Asterix games,
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341 line in Road Rash 3, etc.
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342 * Minor sprite and layer scroll masking bugs fixed.
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343 + Added partial interlace mode renderer (Sonic 2 vs mode)
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344 * Fixed a crash in both renderers when certain size window layers were used.
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345 + Added emulation of shadow/hilight operator sprites. Other shadow/hilight
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346 effects are still unemulated.
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347 + Sprite emulation is more accurate, sprite limit is emulated.
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348 + Added "accurate sprites" option, which always draws sprites in correct
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349 order and emulates sprite collision bit, but is significantly slower.
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352 * Improved interrupt handling, added deferred interrupt emulation
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354 + Added serial EEPROM SRAM support (Wonder Boy in Monster World,
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355 Megaman - The Wily Wars and many EA sports games like NBA Jam).
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356 + Implemented ROM banking for Super Street Fighter II - The New Challengers
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357 * Updated to the latest version of DrZ80 core, integrated memory handlers
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358 in it for better performance. A noticeable performance increase, but save
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359 states may not work from the previous version (you can only use them with
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360 sound disabled in that case).
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361 + SRAM word read handler was using incorrect byte order, fixed.
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363 Changes in Cyclone 0.0086:
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364 + Added missing CHK opcode handler (used by SeaQuest DSV).
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365 + Added missing TAS opcode handler (Gargoyles,Bubba N Stix,...). As in real genesis,
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366 memory write-back phase is ignored (but can be enabled in config.h if needed).
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367 + Added missing NBCD and TRAPV opcode handlers.
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368 + Added missing addressing mode for CMP/EOR.
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369 + Added some minor optimizations.
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370 - Removed 216 handlers for 2927 opcodes which were generated for invalid addressing modes.
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371 + Fixed flags for ASL, NEG, NEGX, DIVU, ADDX, SUBX, ROXR.
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372 + Bugs fixed in MOVEP, LINK, ADDQ, DIVS handlers.
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373 * Undocumented flags for CHK, ABCD, SBCD and NBCD are now emulated the same way as in Musashi.
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374 + Added Uninitialized Interrupt emulation.
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375 + Altered timing for about half of opcodes to match Musashi's.
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378 * Nearly all VDP code was rewritten in ARM asm. Gives ~10-25% performance
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379 increase (depends on game).
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380 * Optimized 32-column renderer not to render tiles offscreen, games which
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381 use 32-column display (like Shining Force) run ~50% faster.
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382 + Added new "Alternative renderer", which gives another ~30-45% performance
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383 increase (in addition to mentioned above), but works only with some games,
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384 because it is missing some features (it uses tile-based renderering
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385 instead of default line-based and disables H-ints).
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386 + Added "fit2" display mode for all FC gamers. It always uses 208x146 for
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387 P800 and 208x208 for all other phones.
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388 + Added volume control for Motorolas (experimental).
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391 + Added support for vertical window (used by Vapor Trail, Mercs, GRIND
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392 Stormer and others).
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393 + Added sprite masking (hiding), adds some speed.
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394 + Added preliminary H counter emulation. Comix Zone and Sonic 3D Blast
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395 special stage are now playable.
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396 + Added column based vertical scrolling (Gunstar Heroes battleship level,
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397 Sonic and Knuckles lava boss, etc).
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400 + Re-added and improved Z80 faking when Z80 is disabled. Many games now can
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401 be played without enabling Z80 (Lost Vikings, Syndicate, etc), but some
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402 still need it (International Superstar Soccer Deluxe).
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403 * Improved ym2612 timers, Outrun music plays at correct speed, voices in
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404 Earthworm Jim play better, more games play sound.
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405 * I/O registers now remember their values (needed for Pirates! Gold)
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406 + Added support for 6 button pad.
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408 Changes in Cyclone 0.0083wip:
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409 + Added missing CHK opcode (used by SeaQuest DSV).
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410 + Added missing TAS opcode (Gargoyles). As in real genesis, write-back phase
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411 is ignored (but is enabled for other systems).
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413 Backported stuff from Snes9x:
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414 * Fixed Pxxx jog up/down which were not working in game.
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415 + Added an option to gzip save states to save space.
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416 + The emulator now pauses whenever it is loosing focus, so it will now pause
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417 when alarm/ponecall/battery low/... windows come up.
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418 - Removed 'pause on phonecall' feature, as it is no longer needed.
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419 + Video fix for asian A1000s.
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422 * Started using tools from "Symbian GCC Improvement Project", which give
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423 considerable speed increase (~4fps in "center 90" mode).
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424 * Rewrote some drawing routines in ARM assembly (gives ~6 more fps in
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426 * Minor improvement to 0 and 180 "fit" modes. Now they look slightly better
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428 * Minor stability improvements (emulator is less likely to crash).
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429 + Added some background for OSD text for better readability.
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430 + Added Pal/NTSC detection. This is needed for proper sound speed.
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431 + Implemented Reesy's DrZ80 Z80 emu. Made some changes to it with hope to make
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433 + Implemented ym2612 emu from the MAME project. Runs well but sometimes sounds
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434 a bit weird. Could be a little faster, so made some changes too.
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435 + Implemented SN76489 emu from the MAME project.
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436 + Added two separate sound output methods (mediaserver and cmaudiofb) with
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437 autodetection (needs testing).
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438 * Fixed VDP DMA fill emulation (as described in Charles MacDonald's docs),
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439 fixes Contra and some other games.
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443 * Launcher now starts emulation process from current directory,
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444 not from hardcoded paths.
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445 * Improved 'pause on call' feature, should hopefully work with Motorola phones.
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454 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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455 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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456 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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457 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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458 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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459 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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460 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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461 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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462 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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463 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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464 POSSIBILITY OF SUCH DAMAGE.
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466 SEGA/Genesis/MegaDrive/SEGA-CD/Mega-CD/32X are trademarks of
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467 Sega Enterprises Ltd.
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notaz.gp2x.de / picodrive.git / blob