Helios Version 26.0408

Helios v26.0408, a Java-based multi-system emulator focused on Sega 16-bit systems, has been released. Initially a Sega Megadrive/Genesis emulator, it now supports various platforms, including Sega Master System and NES. Key updates include improved palette changes and fast mode for the 32X, ROM database updates for SMS and MSX, and bug fixes across several systems. Enhancements include better handling of interrupts and prefetch logic, plus user interface improvements like a performance indicator. The software is still a work in progress but shows significant advancements in multiple areas. Download is available for version v26.0408.

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Helios v26.0408 has been released. This Java-based multi-system emulator primarily targets Sega 16-bit systems. It started as a Sega Megadrive/Genesis emulator and has since expanded to support the following systems: Sega Megadrive/32X; Sega Master System/Game Gear; Sega SG-1000; Colecovision; MSX v1; NES.

Helios changelog:
32x: added support for palette changes during hblank in packedPx mode
32x: introduced fast mode with cache disabled, fast FM, sh2cycle=192
32x: resolved cache refill issue
32x: defaults to homebrew BIOSes
32x: set 68S to 0 when DMA finishes
68k: updated library with prefetch fixes, enabled prefetch by default
helios: updated ROM database for SMS and MSX
mcd: numerous changes and fixes, still a work in progress
md: enhanced VDP SAT location update logic
md: applied 68k prefetch on invalid bus reads
md: corrected hint pending logic
md: addressed more VDP interrupt edge cases
md: handles z80res even when !z80busreq
mcd: many modifications, still WIP
sh2: fixed macw
sh2: DRC, TRAPA is now recognized as a branch instruction
sh2: refined handling of multiple interrupts
ui: introduced performance indicator, showing the percentage of frame time spent idle