higan 110

Description

higan is a multi-system emulator that began development on October 14th, 2004. The purpose of higan is to serve as hardware documentation in source code form: it is meant to be as accurate and complete as possible, with code that is easy to read and understand.

higan currently emulates the following systems:

Famicom + Famicom Disk System
Super Famicom + Super Game Boy
Game Boy + Game Boy Color
Game Boy Advance + Game Boy Player
SG-1000 + SC-3000
Master System + Game Gear
Mega Drive + Mega CD
PC Engine + SuperGrafx
MSX + MSX2
ColecoVision
Neo Geo Pocket + Neo Geo Pocket Color
WonderSwan + WonderSwan Color + SwanCrystal + Pocket Challenge V2

Changelog

This release substantially improves PC Engine emulation, fixing 80% of known issues.

Regretfully, this will be my final release. I will be stepping down, and my emulators will be maintained going forward as a team project. I'll have more to say on this in the near future in a separate post.

Changelog:

PC Engine: improved IRQ handling significantly
PC Engine: fixed T-flag instructions, and implemented all addressing modes for it
PC Engine: improved VDP penalty cycle timing
PC Engine: always fire Vblank IRQs every frame, regardless of VDW setting
PC Engine: add support for STreet Fighter II CE's custom mapper
PC Engine: emulated MPR latch used by TMA and TAM instructions
PC Engine: randomize various registers and memory at power-on
PC Engine: do not allow block moves to read from $ff:0800-17ff
PC Engine: always set P.B flag (except when pushing P during BRK)
PC Engine: delay PSG synchronization when not needed (~8% speedup for accuracy profile)
PC Engine: emulate 4-color background and sprite modes
PC Engine: emulate grayscale VCE mode
PC Engine: emulate extra scanline VCE mode
PC Engine: fixed VRAM->VRAM DMA transfers (was transferring one byte less than it should)
PC Engine: improve burst-mode emulation (early VRAM->VRAM termination, etc)
PC Engine: add display timing latching to the performance profile's scanline renderer
PC Engine: many disassembler improvements
PC Engine CD: added skeleton implementation (non-functional)
Mega Drive: fix a crash when loading Sonic & Knuckles or the Game Genie without a daughter cartridge connected
higan: fix System menu option enabling when "Create New System" is selected
icarus: fix typo in save RAM portion of Master System game manifests (was marked as ROM by mistake)
byuu: don't show the program icon briefly when loading a new game
byuu: focus the viewport after loading games
byuu: add trace log path override option
byuu: use save path override for SNES save RAM files as well