MD模拟器PicoDrive v1.50

PSP用MD模拟器PicoDrive v1.50发布，也是当前PSP上最好的MD模拟器，支持大部分MD游戏，支持声音，存档等，新版主要针对SEGA CD游戏方面进行大量改良，还有YM2612音源修正，新版改进如下：

* Added some basic support for Sega Pico, a MegaDrive-based toy.
* Added proper support for cue/bin images, including cdda playback. .cue sheets with iso/cso/mp3/wav files listed in them are now supported too (but 44kHz restriction still applies).
* Added bin_to_cso_mp3 tool, based on Exophase's bin_to_iso_ogg. The tool can convert .cue/.bin Sega CD images to .cso/.mp3.
* Greatly improved Sega CD load times.
* Changed how scheduling between 68k and z80 is handled. Improves performance for some games.
* YM2612 state was not 100% saved, this should be better now.
* Improved renderer performance for shadow/hilight mode.
* Added a hack for YM2612 frequency overflow issue (bleep noises in Shaq Fu, Spider-Man - The Animated Series (intro music), etc.). Credits to Nemesis @ spritesmind forum. Works only sound rate is set to 44kHz.
* Implemented some sprite rendering improvements, as suggested by Exophase.
* Added better idle loop detection, based on Lordus' idea again.
* "accurate timing" option removed, as disabling it no longer improves performance.
* "accurate sprites" was removed too, the new sprite code can properly handle sprite priorities in all cases.
* Timers adjusted again.
* Improved .smd detection code.
* ARM: fixed a bug in DrZ80 core, which could cause problems in some rare cases.
* ARM: fixed a problem of occasional clicks on MP3 music start.
* Minor general optimizations and menu improvements.
* Fixed a bug in Sega CD savestate loader, where the game would sometimes crash after load.
* Fixed a crash of games using eeprom (introduced in 1.40b).

MD游戏  http://www.emu999.net/rom/MD/

中文MD游戏  http://www.emu999.net/rom/zhongwenyouxi/zhongwenMD/