Genesis-Plus-GX/sdl2/CHANGELOG.txt

--------------------
Genesis Plus History
--------------------

All recent changes were backported from the GX version (Gamecube/Wii port), maintained by Eke-Eke.
Please look at http://code.google.com/p/genplus-gx/ for more infos.


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Genesis Plus GX 1.7.4 (21/06/2013) (Eke-Eke)
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[Core/SCD]
---------------
* fixed access to read-only registers on Main-CPU side ("Batman Returns" platform level freeze)
* fixed & improved emulation of PRG-RAM write protection register ("Lunar Eternal Blue" japanese version freeze)
* improved SUB & MAIN-CPU synchronization ("Dracula Unleashed" freeze when using US Model 2 BIOS)
* improved CPU polling detection
* improved CDD emulation & added CD drive access time for SEEK command ("Panic!/Switch" intro missing scene)
* added missing reinitialization of MAIN-CPU PRG-RAM bank on reset
* added .OGG audio tracks support through LIBTREMOR

[Core/Sound]
---------------
* fixed YM2612 configurable DAC depth emulation
* improved Low-Pass filter
* added optional "MONO" output mode

[Core/VDP]
---------------
* fixed FIFO access timings when using invalid write code value ("Clue" menu)
* fixed DMA Copy with undocumented code value ("Fatal Labyrinth" end sequence)
* minor code fixes & optimizations

[Core/CPU]
---------------
* optimized 68k stack read/write functions
* fixed broken 68k address error emulation
* fixed 68k interrupt behavior (prevents interrupts from being executed multiple time when 68k is halted)
* fixed Z80 registers initial state, added proper initialization when using PBC (verified on real hardware by Charles McDonald)

[Core/MD]
---------------
* fixed SRAM incompatibilities between BIG ENDIAN & LITTLE ENDIAN platforms (note: this breaks old .srm files with LITTLE ENDIAN platform ports)
* added support for a few recently dumped unlicensed games
* added auto-detection of byte-swapped ROM files


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Genesis Plus GX 1.7.3 (26/11/2012) (Eke-Eke)
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no win32/SDL port changes


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Genesis Plus GX 1.7.2 (24/11/2012) (Eke-Eke)
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[Core/SCD]
---------------
* added default TOC for Shadow of the Beast II (prevent hangs when audio tracks are missing)
* fixed CD-DA fader muting
* fixed PCM channels panning on reset
* fixed backup RAM file management when using disc swap with Mode 1 cartridge
* incremented CD drive read latency: fixes Space Adventure Cobra (freeze when opening coffin at 2nd morgue scene)
* improved CDD emulation accuracy: fixes Snatcher (freeze at the end of Act 2) & various CD player bugs
* improved MAIN-SUB memory map mirroring in SCD mode (verified on real hardware by Charles McDonald)
* implemented cycle-accurate "stopwatch" register emulation

[Core/Sound]
---------------
* fixed broken PSG noise frequency
* fixed incorrect Game Gear PSG stereo emulation
* implemented cycle-accurate Game Gear PSG stereo

[Core/VDP]
---------------
* fixed broken VDP DMA from SVP ROM latency (graphic errors in Virtua Racing)

[Core/MD]
---------------
* added Super Mario World 64 (unlicensed) cartridge hardware emulation

[Core/Input]
---------------
* added automatic detection for CD games with Justifier/Menacer support
* improved Justifier/Menacer emulation


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Genesis Plus GX 1.7.1 (13/10/2012) (Eke-Eke)
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[Core/SCD]
---------------
* added support for CUE files
* added CD-DA tracks emulation (needs CUE+BIN or ISO+WAV images)
* added CD fader emulation
* added CDD "Fast FW" & "Fast RW" commands emulation
* improved CDD TOC emulation (random freezes in Sonic CD, Switch/Panic, Final Fight CD and probably many others)
* improved PCM chip synchronization with SUB-CPU (missing speeches in Willy Beamish)
* fixed PCM chip emulation (random hangs in Snatcher, missing sound effects in Switch/Panic, Final Fight CD, Wonderdog...)
* fixed Word-RAM memory mode on soft-reset (missing logo gfx effects)
* fixed SUB-CPU access to unused areas when using PC-relative instructions (Final Fight CD first boss random crash)
* fixed CPU idle loop detection on memory mode register access (Pugsy CD first boss slowdown)
* fixed Mode 1 emulation (cartridge boot mode)

[Core/Sound]
---------------
* replaced FIR resampler by Blip Buffer for FM resampling
* modified SN76489 core for use of Blip Buffer
* improved PSG & FM chips synchronization using Blip Buffer
* added Game Gear PSG stereo support
* fixed SG-1000 specific PSG noise
* fixed YM2612 LFO AM waveform (California Games surfing event)
* fixed YM2612 phase precision
* minor optimizations to YM2612 core

[Core/Game Gear]
---------------
* added support for CJ Elephant Fugitive (recently released by SMS Power)
* added Game Gear extended screen option

[Core/Genesis]
---------------
* added support for a few recently dumped (but unreleased) games

[Core/General]
---------------
* improved ROM & CD image file loading
* various code cleanup


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Genesis Plus GX 1.7.0 (01/07/2012) (Eke-Eke)
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[Core/SCD]
---------------
* added Mega CD / Sega CD hardware emulation (incl. Sub 68K, CDD, CDC, PCM, GFX rotation/scaling, etc)
* added .ISO & .BIN CD image file support
* added 512K backup cartridge RAM support
* added savestate support for CD games

NOTES:
~~~~~~
* to play CD games, original BIOS ROM files are required in /genplus/bios/ directory: unzip & rename them to bios_CD_U.bin, bios_CD_E.bin, bios_CD_J.bin 
* CD audio tracks (CD-DA) are not supported (yet)

[Core/CPU]
---------------
* modified 68k core for Mega CD / Sega CD support
* optimized 68k core using prebuild const tables

[Core/VDP]
---------------
* improved DMA accuracy
* improved accuracy of nametables register & VSRAM writes during HBLANK: fixes "The Adventures of Batman & Robin" (graphical issues during 2nd Boss fight).
* added support for 8-bit VRAM writes with undocumented code value (verified on real hardware by Nemesis)

[Core/Sound]
---------------
* improved synchronization between SN76489 & YM2162 cores.
* improved accuracy of SN76489 core timings.

[Core/MD]
---------------
* added support for some recently dumped unlicensed games.
* improved emulation of 32k bankswitch hardware used by a few unlicensed games.
* fixed behavior of Z80 banked reads from 68k RAM (verified on real hardware).
* fixed support for 128K Pro Action Replay ROM.

[Core/MS]
---------------
* added support for all recent korean ROM dumps by SMS Power.
* added emulation of korean multi-game mapper (4-Pak All Action)
* added pseudo-random RAM pattern initialization on Mark-III and Japanese Master System (fixes "Alibaba and 40 Thieves" & "Block Hole")
* added port $3E emulation & internal BOOTROM support (Master System & Game Gear only).

[Core/General]
---------------
* added an option to set VDP mode (PAL/NTSC) independently from console region.
* added an option to select original system master clock frequency (PAL/NTSC/AUTO), emulation will run at selected frequency when VSYNC is disabled.
* fixed 68k context loading/saving (Sol Deace).
* fixed C89 incompatibilities for better portability.
* removed use of "long int" type for portability on 64-bit platforms.
* moved savestate zlib compression out of emulation core (for ports that don't use it).
* various optimizations.

[Gamecube/Wii]
---------------
* removed ROM load device selection from Load Menu: default ROM device must now be configured in menu settings.
* added specific load buttons, browsers & saved paths for each systems, this also fixes slowdowns caused by screenshot loading when browsing from slow devices.
* added support for left/right buttons as page up/down keys in ROM browsers
* added right analog stick as default "return to menu" key for Gamecube controllers
* added alternate remappable menu key combo for Gamecube controllers
* added an option to disable VSYNC (emulator is synced with audio hardware instead of video).
* added an option to boot system from "BIOS", with or without cartridge.
* added Master System & Game Gear "BIOS" support (files should be named bios_U.sms, bios_J.sms, bios_E.sms & bios.gg and copied to /genplus/bios directory).
* replaced "Hard Reset" button by a Soft Reset for systems having a Reset button (Mega Drive / Genesis & Master System)
* State & SRAM files are now only compressed when saving to Gamecube Memory Cards
* various fixes & cleanup.
* compiled with devkitPPC r26 & libogc 1.8.11.

[Gamecube]
----------
* improved progressive mode support when component cable is detected (hold B during startup to switch menu video mode configuration)


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[07/08/2011] version 1.6.0 (Eke-Eke)
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[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 http://cgfm2.emuviews.com/)
* removed DOS port
* various code cleanup.


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[31/03/2011] version 1.5.0 (Eke-Eke)
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[Core/VDP]
---------------
* added support for Master System compatibility mode (Z80 ports access mode), incl. Mode 5 rendering.
* added Mode 4 rendering for both Genesis & Master System modes.
* added alternate BG planes rendering functions (should be faster on PPC architectures).

[Core/IO]
---------------
* added support for Master System compatibility mode (Z80 ports access mode).
* added Master System peripherals emulation (Control Pad, Paddle, Sports Pad & Light Phaser).
* added XE-1AP (analog controller) emulation.
* added Activator emulation.

[Core/Extra]
---------------
* added support for all known Master System cartridge mappers.
* added copy-protection hardware emulation for a few MD unlicensed games: fixes 777 Casino (crash when talking to bunny girls).
(NB: most of those unlicensed games seem to have been already patched by ROM dumpers, main purpose is documenting them)
* added support for Top Shooter arcade board controller. (A=Shoot, B=Bet, C/RIGHT=Coins, START=Start, hold UP on startup to enter service mode)
* improved King of Fighters 98 mapper emulation (registers address decoding is now 100% accurate)
* fixed Game Genie when several codes affect same ROM address.
* fixed EEPROM types for Brian Lara Cricket & NBA Jam TE (verified on real cartridges)

[Core/General]
---------------
* added Master System compatibility mode emulation (automatically enabled when loading ROM file with .sms extension).
* improved savestate stability & compatibility (support for old 1.4.x savestates is preserved)
* various code cleanup & comments.


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[04/12/2010] version 1.4.1 (Eke-Eke)
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[Core/Sound]
---------------
* implemented Blargg's blip buffer in SN76489 core (all channels are now lineary interpolated)

[Core/VDP]
---------------
* improved 2-cell vscroll emulation accuracy, as verified on real hardware (Gynoug, Cutie Suzuki no Ringside Angel, Formula One, Kawasaki Superbike Challenge)
* improved VBLANK flag accuracy, as observed on real hardware.
* improved DMA operations accuracy, writes are now performed on a scanline basis: fixes Gaiares (flickering title screen).
* improved DMA Fill timing accuracy.
* fixed DMA with bad code values: fixes Williams Arcade Classics (corrupted gfx after soft reset).
* fixed horizontal resolution changes during HBLANK: fixes Bugs Bunny in Double Trouble (2nd stage).
* fixed Vertical Counter in interlace mode 1, as observed on real hardware.
* fixed horizontal border width, as observed on real hardware.
* various code improvments & optimizations.

[Core/CPU]
---------------
* fixed state of Z80 registers on reset (sound issues with Defender & Defender 2 in Williams Arcade Classics)
* implemented 68k undocumented flags behavior for DIVU/DIVS instructions (Bloodshot / Battle Frenzy)

[Core/Extra]
---------------
* improved emulation of copy-protection hardware found in some unlicensed cartridges (Mulan, Pocket Monsters II).
* enabled simultaneous use of multitap & J-CART (Super Skidmarks 6-player mode)
* improved savestate format: added DMA, SVP, cartridge mapping & internal registers state informations
* improved unlicensed ROM mappers emulation
* added Chinese Fighters III mapper support
* added Top Fighter mapper support
* fixed Barver Battle Saga mapper support
* fixed cartridge hardware soft-reset (Game Genie, SVP, ...)
* fixed Game Genie registers byte reads


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[06/30/10] version 1.4.0 (Eke-Eke)
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[Core/Sound]

* completely rewrote sound processing/mixing: sound chips are now clocked with exact output framerate
to ensure 100% smooth video & audio playback, with no lag or skipping, while rendering an accurate number
of samples per frame and keeping PSG & FM chips in sync.
* improved PSG & FM chips synchronization with CPU execution (fixed point precision).
* improved YM2612 core general accuracy (SSG-EG, CSM mode,...) (based upon Nemesis recent tests on real hardware)
* improved YM2612 LFO emulation accuracy: fixes "Spider-Man & Venom : Separation Anxiety" (intro)
* fixed YM2612 bug with Timer B: fixes "Langrisser Hikari II"/"Der Langrisser II" (Sega logo)
* fixed YM2612 context saving/loading.
* fixed YM2612 state on reset.
* removed outdated & less accurate Gens YM2612 core
* added configurable YM2612 DAC resolution emulation.
* added configurable & faster FIR resampler (thanks to Blargg & AamirM), removed libsamplerate support.
* added configurable Low-Pass filtering
* added configurable 3-Band Equalizer (thanks to Neil C).
* added an option to boost SN76489 Noise Channel.
* adjusted SN76489 cut-off frequency.


[Core/VDP]

* added support for CRAM writes during horizontal blanking (Striker, Zero the Kamikaze Squirrel,...)
* added support for 2-Cell vertical scrolling in Interlaced 2 mode
* added support for some undocumented mode register bits
* added proper emulation of HV Counter latch: fixes Sunset Riders intro
* added pixel-accurate emulation of mid-line display on/off (Nigel Mansell World Championship PAL, Ren & Stimpy's Invention PAL,...)
* improved FIFO timings accuracy: fixes Sol Deace intro
* improved sprite masking accuracy (thanks to Nemesis for his test program)
* improved sprites processing accuracy: fixes (un)masked sprites in Mickey Mania (3D level), Sonic 2 (VS mode).
* improved HBLANK flag timing accuracy: fixes Mega Turrican (Sky level)
* improved horizontal blanking & HINT/VINT occurence timing accuracy, as measured on real hardware.
* improved HCounter accuracy in 40-cell mode, as measured on real hardware.
* improved color accuracy in VDP highlight mode to match results observed on real hardware


[Core/CPU]

* updated Z80 core to last version (fixes interrupt Mode 0 timing and some BIT instructions).
* fixed some Z80 instructions timing.
* improved Z80 interrupt accuracy
* improved 68k accuracy (initial Reset timing + auto-vectored interrupts handling).
* improved 68k timing accuracy for DIVU/DVIS (thanks to Jorge Cwik) & MULU/MULS instructions.
* improved Z80 & 68k cpu execution/synchronization accuracy by using Master Clock as common reference (now run exactly 3420 M-Cycles per line).
* modified Z80 & 68k cores to directly use external cycle count instead of intermediate counters.


[Core/Extra]

* added Game Genie hardware emulation (Game Genie ROM is now fully supported).
* added Action Replay hardware emulation (Action replay ROM is now fully supported).
* added S&K "Lock-On" hardware emulation (you can "lock" any games to Sonic & Knuckles).
* added Cartridge "hot swap" feature.
* added missing EEPROM support in some games.
* added accurate TMSS emulation (VDP lock-out)
* fixed Realtec mapper emulation: fixes missing sound in Balloon Boy / Funny World.
* fixed lightgun auto-detection: fixes default cursor position in Lethal Enforcers II.
* lots of code cleanup, bugfixes & optimization.


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 [12/14/08] version 1.3.0 (Eke-Eke) 
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* YM2612 bugfixes (MAME core):
  .fixed EG Decay->Substain transition when SL & DR are minimals: fix tracks #3 and #9 in "Mega Turrican"
  .fixed a bug in SSG-EG emulation code: fix Level 1 music in "Alisia Dragoon"
  .modified SSG-EG Decay End Level: fix some sound effects (ChainSaw, Zap...) in "Beavis & Butthead"
  .improved Detune overflow accuracy: fix very high frequency sounds in many games
  .fixed registers 0x20-0x26 Reset state: fix intro music in "B.O.B"
  .reverted incorrect fix with KEY ON: fix "Flamethrower" sound effect in "Alien 3" and many others
* adjusted HCounter values: fixes line flickering in "Sonic 3D" bonus stage
* adjusted VINT timing: fixes hang-up in "V.R Troopers"
* improved HBLANK flag accuracy: fixes line flickering in "Gouketsuji Ichizoku"
* fixed broken Z80 access to WRAM: fixes hang-up in "Mamono Hunter Youko"
* modified JCART emulation: fixes corrupted tracks logo in "Micro Machines 2"
* added Blargg's NTSC Filters support (NTSC video artifacts emulation)
* optimized VDP rendering core, rewrote 68k interface (memory handlers, cycle execution, interrupts): greatly improved emulation speed


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 [08/26/08] (Eke-Eke)
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* YM2612(MAME): fixed LFO phase update for CH3 special mode: fix sound effects in Warlock & Aladdin (thanks to AamirM)
* YM2612(MAME): fixed EG attenuation level on "KEY ON": fix Ecco 2's splash sound
* YM2612(MAME): fixed SSG-EG emulation: fix Bubba'n Stix (Track 5) and many others
* YM2612(MAME): replaced sample interpolation with libsamplerate support, High Quality mode is now more accurate
* implemented cycle-accurate HINT timings: every timing sensitive games/demos are now *finally* working fine
* fixed a bug affecting CRAM/VSRAM DMA timings
* fixed Sprite Attribute Table address mask for VRAM writes 
* improved accuracy of 68k access to Z80: fix music in Pacman 2 when entering PAUSE menu
* disabled "Address Error" emulation when UMK3 hack is loaded: fix game crashing after a round ends up
* added support for some more unlicensed games: Pocket Monster, King of Fighter 98, Soul Blade (credits to Haze)
* improved Menacer emulation: fix lightgun support in Body Count & T2: The Arcade Game
* added Konami Justifier emulation: fix lightgun support in Lethal Enforcers 1 & 2
* added Sega Mouse emulation (Populous 2, Body Count, Shangai 2, Fun'n Games, ...)


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 [07/16/08] (Eke-Eke)
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* adjusted (again) HINT timings: fix Double Dragon 2 (game freezed), hopefully does not break anything else
* fixed broken EEPROM support for Codemaster games
* modified input update timings: fix Dungeons & Dragons * Warriors of the Eternal Sun (thanks to Notaz)
* added support for "Ultimate Mortal Kombat Trilogy" hack (max. size supported is 10MBytes)
* added (VERY) preliminar support for PICO roms (credits to Notaz for his documentation)
* improved YM2612 emulation (credits to Nemesis for his tests on real hardware):
  .implemented phase overflow emulation: improved fix for special music instrument used in Comix Zone, Flashback, Ariel, Shaq Fu...
  .improved SSG-EG emulation in MAME core (also based on additional code from Alone Coder)
  .improved Timers emulation accuracy
  .improved Enveloppe Generator accuracy
  .fixed Channel 3 CSM mode emulation
  .implemented sample interpolation in MAME core to emulate the chip at original frequency (HQ YM2612 mode, from gens)


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 [06/01/08] (Eke-Eke)
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* improved HCounter accuracy: fix graphic glitches in "Striker (Europe)"
* improved HINT timing accuracy: fix flickering in "Zero The Kamikaze Squirrel (USA)"
* improved rendering accuracy when backdrop color is modified during HBLANK (Road Rash I/II/III)
* fixed broken Game Genie support
 

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 [04/19/08] (Eke-Eke)
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* modified VINT timings a little bit: fix lockup during Desert Strike's intro
* corrected 68k interrupts handling: fix graphic glitches in Darius II/Sagaia


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 [04/06/08] (Eke-Eke)
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* updated SVP core: fix some perspective issues in Virtua Racing (thanks to Notaz)
* added internal SAT update during VRAM Fill: fix unmasked sprites during Battletech's intro
* fixed m68k core issues with gcc 4.2.3: fix Xperts, Lemmings 2, M1 Abrams Battle Tank
* forced YM2612 Enveloppe update: fix intro music in Batman&Robin (thanks to Aamir)


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 [03/01/08] (Eke-Eke)
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* added SVP emulation: Virtua Racing is now emulated (big thanks to Notaz and TascoDeluxe)
* fixed VDP registers behaviour when VDP Mode 4 is enabled: fix Bass Masters Classic Pro, Captain Planet & The Planeeters
* corrected a bug in DMA Fill operation: fix James Pond 3, Rockman World/Megaman Willy Wars (corrupted VRAM)
* corrected typo errors in CPU cycle counters update: fix optiom screen music in "College Slam" and probably others games.
* added preliminary support of undocumented YM2612 bug: fixes soundtracks of Shaq Fu, Spiderman, Comix Zone, Ariel and some others
* added support for mappers & copy protection devices used in many unlicensed/pirate cartridges (see cart_hw.c for details)
* rewrote memory handlers for better modularity and some (little) speedup
* reduced Savestate size


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 [01/07/08] (Eke-Eke)
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* fixed interleaved rom detection: roms with .smd extension should now work fine
* fixed a recently introduced bug in VDP registers writes: fixes bad colors in Toy Story (intro)
* updated list of games using EEPROM: added Sports Talk Baseball (internal memory check fixed) and Brian Lara Cricket
* fixed VINT flag update when VINT is disabled: fixes NCAA College Football
* adjusted DMA timings in H32 mode: fixes flickering in Out of this World, Kawasaki Superbike Challenge & Formula One
* adjusted line rendering and HBLANK timings: fixes flickering in Nigel Mansell's World Championship Racing, Deadly Moves/Power Athlete
* fixed unmapped ROM reads through Z80 Bank: fixes Zombie High (Proto)
* added support for custom ROM/RAM mapping used by Game no Kanzume Otokuyou


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 [12/28/07] (Eke-Eke)
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* many sourcecode cleanup and optimization
* completely rewrote EEPROM emulation: now support all known EEPROM types (24C01-24C65) and mappers (Sega, Acclaim, EA, Codemasters)
used in a few games (now use internal game database) as external RAM. This should at least fix save support in the following games:
  . NBA Jam (alternate Acclaim mapper)
  . College Slam, Frank Thomas Big Hurt Baseball (24C65 type)
  . NHLPA Hockey 93, Rings of Power (EA mapper)
  . Micro Machines serie, Brian Lara Cricket 96/Shane Warne Cricket (Codemasters mapper)
* external RAM is now initialized to 0xFF by default: fix Micromachines 2, Dino Dini Soccer 
* fixed SRAM 16-bits memory handlers: fix some Sega Sports and EA Sports games (NFL95, NBA Action 95, NHL97, NHL98,...)
* modified WRITE_xxx & READ_xxx macros for better portability and faster memory access on BIG ENDIAN platform 
* completely rewrote BIG ENDIAN support in render.c and vdp.c: rendering should be a little faster
* rewrote ROM bankswitch emulation (Super Street Fighter II): ROM access are faster, using memory pointers instead of reading ROM copy from ARAM 
* fixed leftmost Window/PlaneA column render and implemented Window bug (as described by Charles Mc Donald)
* improved "Sprite Limit" and "Sprite Collision" detection accuracy
* modified RGB565 Color Palette to use the full available color range (0-31;0-63)
* implemented "cycle accurate" HV Interrupt timings: fix Sesame's Street Counting Cafe, Legend of Galahad (intro)
* improved VDP access timings accuracy (added FIFO emulation): fix Double Clutch
* improved DMA timings accuracy: fix Winter Olympics (E), Arch Rivals and probably more
* fixed HCounter again: Road Rash serie (I,II,III) don't need timing hacks anymore
* fixed VCounter in Interlaced 2 mode: fix Combat Cars "VS-Mode"
* improved Interlaced 2 mode (double resolution) rendering: Sonic 2, Combat Cars ("VS-Modes") look far better
* added TMSS BIOS support (optional)
* rewrote part of the YM2162 MAME's core: fixed internal FM timers handling, removed non-YM2612 emulation code and unused multiple cpu support
* implemented "cycle accurate" FM timers & sound samples rendering
* improved Z80 Interrupt timing accuracy: fix Sonic 3 music slowdowns
* updated Z80 & 68000 cores to last MAME versions
* improved Soft Reset emulation: X-Men 2 and Eternal Champions (random character selection) now work more like on real hardware.
* added full overscan emulation (vertical & horizontal borders) for "pixel perfect" aspect ratio (tested against a real genesis)


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 [07/20/07] (Eke-Eke)
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* corrected TeamPlayer support: fix multiplayer in Gauntlet 4 (Sept. version), Pengo and a lot of others
* added J-Cart support: enable multiplayer in Codemasters games (Pete Sampras, Micromachines games, Super Skidmarks)
* added serial EEPROM autodetection: fix games with bad SRAM informations in header (NBA Jam TE)
* added SVP faking: display 2D graphics in Virtua Racing (the game is however still unplayable)
* added support for more internal IO registers: fixe some unlicensed games (Wisdom Tree games...)
* added preliminary support for unmapped protection device: fix some unlicensed games with special built-in hardware (Squirell King, Lion King 2...)
* added "Soft Reset" combo (in game, use L+Z triggers): this should be like pressing the RESET button on a real Genesis and this is required
  in some games to enable special features or even complete the game (ex: X-Men).


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 [06/21/07] (Eke-Eke)
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* added Multitap support (EA 4-Way Play and Sega Teamplayer): allowed up to four players in games supporting those peripherals
* added partial Sega Menacer lightgun support (use Analog Stick): automatically set when detecting the 6-in-1 Menacer game


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 [05/18/07] (Eke-Eke)
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* you can now switch between FM cores without reseting the game. FM registers  value are automatically restored when switching.
* removed the previous VINT timings modification because it brokes some games (Rocket Knight, Thunderforce III,...)
* added automatic Timing configuration (VDP latency, VINT timing & alternate Line Timing) at game loading, based upon specific romname detection.
This means you can still modify some of these options afterwards but they are now automatically set/unset when loading a game which need
special timing fixes. These fixes are also automatically desactivated when the current game doesn't need them.
For information, games that are actually detected and need special timings to run properly are:
 .Legend of Galahad & Road Rash series (single line not rendered properly)
 .Sesame Street Counting Cafe (don't boot)
 .Chaos Engine/Soldiers of Fortune (graphic glitches on scrolling)


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 [05/08/07] (Eke-Eke)
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* VINT timings are now a little more accurate: fixes Sesame's Street Counting Cafe
* SN76496 MAX_OUTPUT back to normal
* modified FB_WNOISE value in SN76496 core according to John Kortink's last informations 
* added support for Maxim's PSG core, same as used in SMSPLUS (it becomes the default PSG core)
* updated FM core to the latest MAME version
* corrected DAC output level (fixes voices and some special FX being too low)
* added support for Gens YM2612 (FM) core (MAME's one still remains default FM core)
* added configurable preamplification for each sound cores (see Emulator Options)
* added some other configurable sound options (boost overall volume, FM improvment for Gens YM2612)


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 [04/11/07] (Eke-Eke)
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* corrected MAX_OUTPUT value in SN76496 core: fix PSG sound (SFX) volume


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 [03/17/07] (Eke-Eke)
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 * added an option to enable alternate line rendering timing (fix single line error in Road Rash series and Legend of Galahad's Intro)
 * Color RAM update now always reset color 0 to border color (fix color glitches in Mortal Kombat,...) (thanks to Noop's for the idea)


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 [03/09/07] (Eke-Eke)
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* modified HV counter tables (fix graphic glitches in Skitchin's sky, Lotus 2 Recs, Panorama Cotton, Dashin Desperados & maybe more)
* completely rewrote DMA timings emulation so that it works for all games (no more cpu freezing)
* added all DMA tranfer rates handling for each three DMA modes and added dma busy flag emulation
* modified interrupts handling on VDP register #0 and #1 writes (fix Lemmings status bar)
* added VDP RAM write latency  (fix Chaos Engine/Soldier of Fortune gfx glitches)
* modified FM timers handling a bit (fix Vectorman2 music)
* corrected Sprite Limit rendering (fix Sonic 1 & Micromachines 2 title screens)
* corrected IO Registers writes (fix Decap' Attack controls, no more need for alternate input)
* corrected 6 Buttons Pad emulation (fix 6buttons detection in Mortal Kombat 3, Comix Zone and other 6-buttons compatible games)
* modified sound mixing a bit according to Generator sourcecode (FM and PSG ratios seems more correct)


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 [02/07/07] (Eke-Eke)
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* fixed fm timers (fix missing music in Castle of Illusion, Quackshot, Undead Line, Wonderboy in Monster Lair, Cal 50, Turbo Outrun, Thundeforce 4 and maybe more)
* added complete EEPROM emulation (save support now works fine in Wonderboy5, Megaman Willy Wars, NBA Jam...)  (credits to Notaz, adapted from Picodrive code)
* added preliminar dma timing emulation (fix bottom screen in Legend of Galahad) (credits to Notaz, adapted from Picodrive code)
* hack: clear Vint pending after Hint (INT level 4) acknowledge (fix Fatal Rewind)
* hack: modify read_bus16 to return a random value (fake fetch) (fix Time Killers)
* modified cpu execution timings, with more correct hblank and interrupts timing  (fix ISS Deluxe, Double Dragon 2 and certainly more) (Based on Gens code)
* modified busreq mechanism: better synchro between z80 & 68k (no need to dejitter anymore) (Based on Gens code)
* added sprite collision detection (fix Strider 2)
* modified dma fill operation for big endian platform (fix Contra Hardcorps gfx garbage)


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 [05/25/03] (Charles MacDonald)
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 * Fixed a typo that made Z80 banked access to the VDP registers always fail.


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 [05/17/03] (Charles MacDonald)
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 * Modified the rendering code to handle unaligned longword access to memory.


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 [04/20/03] (Charles MacDonald)
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 * Modified 68000 emulator to prevent 'tas.b $mem' from writing data back
   after a read (fixes Gargoyles).
 * Fixed bug in 68000 emulator to swap order of words written for address
   register indirect pre-decremented writes (fixes Jim Power graphics).
 * Added support for 240-line displays (for Super Skidmarks).
 * Rewrote part of the interrupt handling (fixes some raster effects).
 * Removed sprite collision detection code (never really worked).
 * Optimized sprite rendering inner loop.


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 [04/13/03] (Charles MacDonald)
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 * Finished up memory map for VDP DMA V-bus reads.
 * Fixed handling of 68000 writes to I/O chip at even addresses.
 * Fixed bit 7 handling of control register in I/O chip.
 * Finished up Z80 memory map.
 * Added code to handle Genesis hardware lock-ups.
 * Removed some faulty code from the 68000 memory map handlers.


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 [03/22/03] (Charles MacDonald)
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 * Completed implementation of Z80 banked memory handlers.