jgenesis v0.10.0

疾风之狼

Notable changes since 0.9.0:

Genesis CRAM dots are now emulated
Significantly improved performance for Genesis and Sega CD, and to a lesser extent 32X
Genesis / Sega CD / 32X audio low-pass filter cutoff freqencies are now configurable
Lots of bugfixes for every emulated system, particularly Genesis
Save states are not compatible with previous versions.

Full changelog below

New Features
(Genesis) CRAM dots are now emulated
(Genesis / Sega CD) Audio low-pass filter cutoff frequencies are now configurable
(Genesis) New option to apply a second-order low-pass filter only to YM2612 audio output, which should be similar to the audio circuitry in later Model 2 consoles (when used in combination with a first-order filter applied to all audio output)
(Genesis) Added an aspect ratio "Auto" option (now default) that will function as either NTSC (8:7 / 32:35 PAR) or PAL (11:8 / 11:10 PAR) based on whether the emulator is running in NTSC or PAL mode
(Genesis) Added an option for whether to emulate YM2612 or YM3438 busy flag behavior, which affects audio in a few games (e.g. Earthworm Jim and Hellfire)
There is also an Always 0 option that is less accurate to hardware but produces the "correct" behavior for both of these games
(SMS / Game Gear) Added a hardware region "Auto" setting that attempts to auto-detect region from the cartridge header (#214)
(SMS) Added the option to boot from a BIOS rather than booting directly into the game
(SMS / Sega CD) Added the ability to boot directly into the BIOS with no cartridge/disc inserted
(NES) Added an option to disable vertical overscan cropping in NTSC mode (i.e. display in 256x240 instead of 256x224)
Added an audio option to mute all emulator audio output (#248)
Added an option to configure the initial window size when not running in fullscreen (#409)
GUI: Added a new File menu button and hotkey to quickly open the most recently opened ROM file (#248)
Multi-System Fixes
Fixed the emulator not reading gamepad inputs while the window does not have focus (#248)
Fixed the GUI sometimes segfaulting when you close the main GUI window while an emulator is running
The GUI window now remembers its size when the application is closed and reopened
Initial window size now takes aspect ratio into account
Genesis / Mega Drive Fixes
Improved both behavioral accuracy and timing accuracy of VDP ports, VDP DMA, and the VDP FIFO; this fixes a number of bugs
Fixes Clue sometimes having corrupted main menu graphics (#159)
Fixes Gaiares having flickering text on the title screen
The emulator now fully passes the VDPFIFOTesting test ROM (#103)
Fixes incorrect color palettes in some demos (#183)
Fixes a glitch on the title screen of the homebrew Rick Dangerous 2 port (#102)
Significantly improved performance due primarily to optimizations related to the YM2612 code
Lots of mostly minor fixes to YM2612 sound chip emulation
Fixed multiple timing precision bugs with the LFO and hardware timers
Fixed vibrato / LFO FM calculations incorrectly using 11-bit precision instead of 12-bit
Fixed vibrato incorrectly affecting how detune computes key code
Fixed the accurate quantization option incorrectly quantizing channel outputs instead of carrier outputs
More accurate emulation of DAC crossover distortion (ladder effect)
Added emulation for operator evaluation pipelining in channel output calculations
Fixed the DAC channel not respecting the channel 6 panning bits
Fixed a Z80 timing bug caused by a VDP DMA "optimization" introduced in v0.8.2; this fixes video/audio desync in Overdrive 2
Fixed behavior when the controller port TH pin is set to input; this fixes controls not working properly in Micro Machines (#226)
Improved display behavior when games switch between H32 and H40 modes shortly after the start of VBlank; this fixes glitchy frames in Bugs Bunny in Double Trouble (#252)
Fixed the window nametable address not being masked correctly in H40 mode; this fixes glitchy graphics on some screens in Cheese Cat-Astrophe Starring Speedy Gonzales (#253)
Added a 1-instruction delay to handling HINT if a game enables HINTs while an HINT is pending; this fixes Fatal Rewind / The Killing Game Show failing to boot (#254)
Added a 1 CPU cycle delay on every 68000 access to the Z80 side of the bus; this fixes broken audio in Pac-Man 2: The New Adventures (#255)
Fixed several major bugs in how the V counter and the VBlank status flag are emulated in interlaced modes; this fixes Combat Cars freezing in 2P mode as well as occasional sprite glitches in Sonic the Hedgehog 2's Vs. mode (#258)
Fixed the Z80 RESET line not resetting the YM2612 in addition to the Z80; this fixes audio glitches in Fantastic Dizzy (#397)
Fixed the emulator not correctly initializing cartridge SRAM when the cartridge header specifies less common RAM types; this fixes the Mega Drive Mode 7 demo not working (#250)
Fixed the interlaced ODD flag in the VDP status register not toggling correctly in single-screen interlaced mode if deinterlacing is enabled (#354)
Fixed a number of European games with bad region headers defaulting to NTSC mode instead of PAL (#176 / #394)
The 68000 interrupt handler now takes 54 CPU cycles instead of 44; this is more accurate and fixes a minor glitch in Overdrive (#419)
Fixed the emulator crashing if a game reads from Z80 $7F0C-$7F0F or writes to Z80 $7F08-$7F0F
When horizontal border rendering is enabled, fixed the right border rendering as the wrong color if the backdrop color is changed between lines (Overdrive 1 does this on some screens)
The non-linear VDP color scale option is now enabled by default because it is more accurate to actual hardware's video output (#249)
Sega CD Fixes
Fixed the CDD reset register ($FF8001) not correctly resetting CDD state; this fixes the Pier Solar enhanced audio disc failing to boot in SCD Mode 2 (#215)
Fixed the CUE parser being too strict around parsing leading whitespace on lines (#418)
Fixed some bugs related to changing discs while a game is running (particularly when using a Model 1 BIOS)
Implemented more accurate memory mirroring in sub CPU memory map; this fixes excessive error logging in WWF: Rage in the Cage (#216)
32X Fixes
Fixed the Genesis VDP and 32X VDP frames incorrectly lining up exactly when the Genesis VDP is in H32 mode; this fixes some minor graphical issues in NFL Quarterback Club (#230)
Files with .bin extensions are now auto-detected as 32X instead of Genesis if they contain the 32X security program at the expected location in ROM (#259)
Horizontal blur shaders now scale the effect properly when the Genesis VDP is in H32 mode
The "apply Genesis low-pass filter to PWM" setting is now on by default because that seems to be more accurate to actual hardware's audio circuitry
Fixed initial window size being slightly too small to fit integer-height-scaled output when the Genesis VDP is in H32 mode (#420)
Master System / Game Gear Fixes
Somewhat improved VDP-related timings; this fixes glitchy cutscene graphics in Madou Monogatari I (#213) and fixes most tests in the SMSVDPTest test ROM (#190)
(SMS) Fixed sprites never displaying on the topmost line of active display
(SMS) Fixed the "crop vertical borders" setting incorrectly cropping the top 16 lines and bottom 16 lines in 224-line mode
(Game Gear) The region bit in I/O port $00 now properly reflects the hardware region instead of being hardcoded to 1; this fixes the Start button not working on the title screen of Pop Breaker (#214)
(Game Gear) Fixed the viewport Y offset being 16 lines off in 224-line mode; this fixes glitchy graphics in Micro Machines (#221)
(Game Gear) I/O port $01 is now read/write; this fixes Primal Rage freezing at the title screen (#220)
NES Fixes
Improved accuracy of Namco 163 expansion audio emulation (used by Megami Tensei II among other games)
Cartridge PRG RAM is now initialized to all 1s instead of all 0s; this fixes Famicom Jump II crashing on first boot (#280)
CNROM cartridges (iNES mapper 3) are now allowed to have PRG RAM; this fixes Hayauchi Super Igo effectively freezing upon starting a game (#273)
Fixed MMC5 PRG RAM bank mapping in MMC5 cartridges that have two 8KB RAM chips; this fixes Uncharted Waters being completely broken upon starting a game (#275)
Added support for NROM cartridges (iNES mapper 0) with only 8KB of PRG ROM; this fixes Galaxian failing to boot (#261)
Fixed a VRC4 mapper bug where the highest bit of the 9-bit CHR ROM bank number was not working correctly; this fixes corrupted graphics in World Hero (#283)
Fixed the DMC sample address incorrectly defaulting to $8000 at power-on instead of $C000 (#292)
PPU palette RAM is now initialized to the palette in the power_up_palette test ROM instead of all 0s
Fixed iNES header parsing reading the wrong byte when checking for the PAL bit; this fixes the Populous prototype incorrectly defaulting to NTSC instead of PAL (#391)
OAMADDR is now reset to 0 on every line during rendering; this fixes Ghostbusters II freezing after the title screen (#421)
SNES Fixes
Fixed incorrect cartridge SRAM mapping for LoROM cartridges with more than 32 KB of SRAM; this fixes Kaite Tsukutte Asoberu Dezaemon failing to boot (#234)
Fixed Mode 7 incorrectly clipping the scrolled center point to signed 11-bit rather than signed 10-bit; this fixes glitched Mode 7 graphics in Kaite Tsukutte Asoberu Dezaemon
Fixed incorrect emulation of interactions between offset-per-tile modes and BG1/BG2 horizontal scrolling; this fixes glitchy graphics in some stages in The Adventures of Batman & Robin (#246)
WRAM contents are now randomized at power-on; this fixes major bugs in Power Drive and the European version of PGA Tour Golf (#188 / #235)
Cartridge SRAM is now initialized to all 1s instead of all 0s; this fixes Ken Griffey Jr. Presents Major League Baseball crashing when you select Season mode (#231)
Fixed incorrect mapping of the DSP-1 port mirrors in LoROM cartridges; this fixes the DSP-1 tech demo prototype not working properly (#233)
Fixed some revisions of Dungeon Master being incorrectly detected as DSP-1 instead of DSP-2
Game Boy [Color] Fixes
The MBC5 ROM bank is now initialized to 1 instead of 0; this fixes Project S-11 failing to boot (#410)
Cartridge SRAM is now initialized to all 1s instead of all 0s

https://github.com/jsgroth/jgenesis/releases

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