mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
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25ef7a2064
- added VFAT support and old files saved - corrected some docs - added SRAM crc calculation after SRAM saving on SDCARD - modified reload_rom actions order - fixed some vdp status bits
149 lines
9.8 KiB
Plaintext
149 lines
9.8 KiB
Plaintext
The Genesis Plus Project
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------------------------------
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CHANGELOG:
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- completely rewrote EEPROM emulation: now support all known EEPROM types (24C01-24C65) and mappers (Sega, Acclaim, EA, Codemasters)
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used in a few games (now use game database) as backup RAM. This should fix SRAM load/save support in the following games:
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. NBA Jam (alternate Acclaim mapper)
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. College Slam, Frank Thomas Big Hurt Baseball (24C65 type)
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. NHLPA Hockey 93, Rings of Power (EA mapper)
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. Micromachines games (Codemasters mapper)
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- modified SRAM initialization with 0xFF data: fix Micromachines 2, Dino Dini Soccer
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- fixed SRAM word read/write handler: fix some Sega Sports and EA Sports games (NFL95, NBA Action 95, NL97, NHL98,...) which previously hang
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- modified WRITE_xxx & READ_xxx macros for portability
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- rewrote BIG ENDIAN support in render.c and vdp.c: it should be a little faster now (no more useless swapping)
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- fixed leftmost Window/PlaneA column render and implemented Window bug (as described in gen-vdp.txt)
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- improved Sprite Limit emulation and Sprite Collision detection
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- fixed test made before CRAM writes
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- removed redundant "color_update()" calls
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- added 9bits (RGB333) pixel color extrapolation to cover full color range (0-31;0-63) in 16-bit rendering mode (RGB565)
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- rewrote Interrupts handling: Sesame's Street Counting Cafe now works without any hacks, other timing sensitive games seems not to be affected
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- modified Hcounter tables: Road Rash games (I,II,III) don't need any timing hacks anymore
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- fixed VDP latency so it does not interfere with DMA timings anymore
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20/07/2007:
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[Genesis]
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- corrected TeamPlayer support: fix multiplayer in Gauntlet 4 (Sept. version), Pengo and a lot of others
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- added J-Cart support: enable multiplayer in Codemasters games (Pete Sampras, Micromachines games, Super Skidmarks)
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- added serial EEPROM autodetection: fix games with bad SRAM informations in header (NBA Jam TE)
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- added SVP faking: display 2D graphics in Virtua Racing (the game is however still unplayable)
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- added support for more internal IO registers: fixe some unlicensed games (Wisdom Tree games...)
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- added preliminary support for unmapped protection device: fix some unlicensed games with special built-in hardware (Squirell King, Lion King 2...)
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- 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
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in some games to enable special features or even complete the game (ex: X-Men).
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[NGC]
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- added separate configuration for PortA/PortB inputs (GAMEPAD, MULTITAP or NONE, see Joypad Config): this let you setting
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PORTB as unplugged, which is needed in some games to access special modes or enable cheat codes (Alien Storm, X-Men...)
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- Freezestate & SRAM files are now compressed (using zlib)
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- FreezeState & SRAM files can now be saved/loaded to/from SDCARD: located in /genplus/saves/ from the root of your SDCARD
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- changed initial ROMS directory for SDCARD user: now looking for /genplus/roms/ from the root of your SDCARD
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- added user-transparent SRAM autoload (detection order is MCARD then SDCARD, SLOTA then SLOTB)
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- "System reboot" is now used for console reboot and SD/PSO reload (if detected)
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- added new font: now use original IPL font, extracted from Bootrom
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- modified controls when going into the rom selection menu (DVD or SDCARD):
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. use B button to go up one directory
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. use Z button to quit the file selection menu
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. use L/R triggers to go down/up one full page
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. use Left/Right buttons or Analog stick to scroll the selected entry's filename when it can't be full displayed
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- various menu rearrangment, minor bugfixes & sourcecode cleanup
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21/06/2007:
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- added 4.7GB DVD support for WII drives (the maximal allowed size for Gamecube DVD is still 1.35GB)
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- removed MPAL video timings, always use 60Hz NTSC: fix display problems for PAL wii users (no more PAL50 version needed)
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- added Console Reboot option in main menu (IPL Reboot)
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- added Multitap support (EA 4-Way Play and Sega Teamplayer): allowed up to four players in games supporting those peripherals
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- added partial Sega Menacer lightgun support (use Analog Stick): automatically set when detecting the 6-in-1 Menacer game
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18/05/2007:
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- you can now switch between FM cores without reseting the game. FM registers value are automatically restored when switching.
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- modified PAL framesync a little bit: the 20ms period is now applied between the start of 2 consecutive frames,
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no more between the end of the previous and the start of the next one, which seems more correct to me
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- removed the previous VINT timings modification because it brokes some games (Rocket Knight, Thunderforce III,...)
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- added automatic Timing configuration (VDP latency, VINT timing & alternate Line Timing) at game loading, based upon specific romname detection.
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This means you can still modify some of these options afterwards but they are now automatically set/unset when loading a game which need
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special timing fixes. These fixes are also automatically desactivated when the current game doesn't need them.
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For your information, games that are actually detected and need special timings to run properly are:
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.Legend of Galahad & Road Rash series (single line not rendered properly)
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.Sesame Street Counting Cafe (don't boot)
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.Chaos Engine/Soldiers of Fortune (graphic glitches on scrolling)
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08/05/2007:
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- corrected L & R buttons assignment: fixes Genesis X & Z buttons being inverted
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- VINT timings are now a little more accurate: fixes Sesame's Street Counting Cafe
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- SN76496 MAX_OUTPUT back to normal
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- modified FB_WNOISE value in SN76496 core according to John Kortink's last informations
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- added support for Maxim's PSG core, same as used in SMSPLUS (it becomes the default PSG core)
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- updated FM core to the latest MAME version
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- corrected DAC output level (fixes voices and some special FX being too low)
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- added support for Gens YM2612 (FM) core (MAME's one still remains default FM core)
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- added configurable preamplification for each sound cores (see Emulator Options)
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- added some other configurable sound options (boost overall volume, FM improvment for Gens YM2612)
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11/04/2007:
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- corrected MAX_OUTPUT value in SN76496 core: fix PSG sound (SFX) volume
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- removed unused sound buffer allocation
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26/03/2007:
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- added DVD automount: automatically call libogc DVD_Mount function if ISO PVD reading failed (idea taken from softdev's last neocdredux release). This may be useful for loading roms from a DVD after booting from SDLOAD or after stopping DVD motor.
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- added "DVD motor off" feature, like in others emulators
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- corrected Memory Card mounting function: EXI_ProbeReset() function was never called if the first mounting attempt failed. Should fix some of the "Unable to mount memory card" errors.
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22/03/2007:
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- added SDCARD subdirectory browsing and LFN (255 char. max) support
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17/03/2007:
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- remove some rendering unused code (only used by DOS version of genesis plus) for little speedup
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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)
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- 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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- added last Softdev's modifications (normalised memory access and ASM GU functions used intead of 'C' ones) for some speedup
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- updated gcaram.c to be compatible with last libogc version
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09/03/2007:
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- little rendering code speedups
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- modified HV counter tables (fix graphic glitches in Skitchin's sky, Lotus 2 Recs, Panorama Cotton, Dashin Desperados & maybe more)
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- completely rewrote DMA timings emulation so that it works for all games (no more cpu freezing)
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- added all DMA tranfer rates handling for each three DMA modes and added dma busy flag emulation
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- modified interrupts handling on VDP register #0 and #1 writes (fix Lemmings status bar)
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- added VDP RAM write latency (fix Chaos Engine/Soldier of Fortune gfx glitches)
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- modified FM timers handling a bit (fix Vectorman2 music)
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- corrected Sprite Limit rendering (fix Sonic 1 & Micromachines 2 title screens)
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- corrected IO Registers writes (fix Decap' Attack controls, no more need for alternate input)
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- corrected 6 Buttons Pad emulation (fix 6buttons detection in Mortal Kombat 3, Comix Zone and other 6-buttons compatible games)
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- modified sound mixing a bit according to Generator sourcecode (FM and PSG ratios seems more correct)
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- added separate CPU Region (USA, Europe, Japan,...) & Speed (PAL or NTSC) choice in menu options
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- modified main frame synchro in PAL mode (fix sound glitch in this mode), thanks to Softdev for the solution
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- added savestates support (go to SRAM menu, memory card supports only)
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07/02/2007: (Eke-Eke)
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- fm timers fixed (fix missing music in Castle of Illusion, Quackshot, Undead Line, Wonderboy in Monster Lair, Cal 50, Turbo Outrun, Thundeforce 4 and maybe more)
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- added complete EEPROM emulation (save support now works fine in Wonderboy5, Megaman Willy Wars, NBA Jam...) (credits to Notaz, adapted from Picodrive code)
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- added preliminar dma timing emulation (fix bottom screen in Legend of Galahad) (credits to Notaz, adapted from Picodrive code)
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- hack: clear Vint pending after Hint (INT level 4) acknowledge (fix Fatal Rewind)
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- hack: modify read_bus16 to return a random value (fake fetch) (fix Time Killers)
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- modified cpu execution timings, with more correct hblank and interrupts timing (fix ISS Deluxe, Double Dragon 2 and certainly more) (Based on Gens code)
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- modified busreq mechanism: better synchro between z80 & 68k (no need to dejitter anymore) (Based on Gens code)
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- added sprite collision detection (fix Strider 2)
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- modified dma fill operation for big endian platform (fix Contra Hardcorps gfx garbage)
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Based on Softdev's initial releases
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WIP1.2 unzip.c
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Added partial zip support
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WIP1.1 sio.c added
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Added six button pad support from x86 Gens
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Additional changes based on Charles MacDonald's gen-hw.txt
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WIP1 07 March 2006
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Updated SN76496 driver
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Added GX Hardware Scaling |