Item description:

Homebrew developer EkeEke has released a new version of Genesis Plus GX, an enhanced version of the Sega Genesis / Sega Megadrive / Sega Master System emulator for the Nintendo Wii based on Charles MacDonald's Genesis Plus project.

Changelog:
Core/Sound

added YM2413 emulation in Master System compatibility mode.
fixed SN76489 noise boost initialization.
minor YM2612 core optimizations.

Core/VDP

added accurate emulation of SG-1000, Master System (315-5124, 315-5246) & Game Gear VDP.
added support for all TMS9918 rendering modes.
improved Mega Drive VDP timings accuracy in Master System Compatibility mode.
fixed color palette initialization.
fixed shifted sprites rendering in Mode 4.
modified pixel rendering support (pixel depth is now forced at compilation time).

Core/CPU

optimized 68k core (rewrote 68k interrupt handling, removed multiple CPU types support & unused code) for 5~8% speed improvment

Core/IO

added accurate emulation of Master System (315-5216, 315-5237, 315-5297) & Game Gear I/O controllers.
added Terebi Oekaki tablet emulation.
improved Mouse emulation (fixes mouse support in Cannon Fodder).
improved Justifier emulation (fixes gun support in Lethal Enforcers 2).
improved 6-Buttons control pad emulation (fixes Duke Nukem 3D)
modified lightgun emulation to use common key inputs for all devices.
2-buttons controller is now picked by default for Master System games.

Core/MD

added copy-protection hardware emulation for some new dumped games (Tiny Toon Adventures 3, Mighty Morphin Power Rangers & The Battle of Red Cliffs).
added Game Toshokan in EEPROM database (verified on real cartridge).
fixed Micro Machines 2 - Turbo Tournament EEPROM size (verified on real cartridge).
modified SRAM banswitch hardware emulation to be more compatible with some hacks.

Core/MS

added Cyborg Z to Korean mapper database.

Core/GG

added 93C46 EEPROM emulation (Majors Pro Baseball, World Series Baseball & World Series Baseball 95).

Core/General

added support for .mdx ROM format.
added Game Gear & SG-1000 ROM support.
added accurate emulation of SG-1000, Master System (I, II) & Game Gear hardware models for 100% compatibility.
updated to new Genesis Plus license (see [ Register or Signin to view external links. ] )
various code cleanup.

Gamecube/Wii

IMPORTANT: cheats, screenshots & save files are now stored in console-specific directories (ex: /snaps/md, /cheats/ms, /saves/gg, ...)
added 8-bit Action Replay & Game Genie codes support (for Master System & Game Gear games).
improved audio/video synchronization for PAL games in 50Hz TV modes (now use VSYNC like NTSC games in 60hz modes).
improved gun cursor positioning accuracy.
improved horizontal scaling & screenshots rendering in H32 mode.
fixed a bug with ROM file extension handling that would affect cheats, snapshots, sram & savestate files.
removed ARAM/injected ROM support (unused).
removed WPAD_ and PAD_ update from VSYNC callback.
increased GCC inlining limits for some speed improvment.
compiled with devkitPPC r24 & libogc 1.8.7.