Commodore 64 Emulator v0.7.9-alpha is released. A Commodore 64 emulator written in modern C++, built with SDL2 and designed around two priorities:Accuracy-first emulation (with a strong focus on real hardware behavior over “good enough” hacks); Debuggability (integrated monitor, break/watchpoints, and visibility into what the machine is doing). This project is actively under development; expect rough edges and incomplete features.

Commodore 64 Emulator Changelog:
This alpha focuses on emulator-core accuracy, VIC-II improvements, expanded tracing/debugging, cartridge and mapper work, save/load fixes, and continued IEC/drive development.
Added
Expanded tracing detail categories across major subsystems
Added more targeted tracing for:
CPU
VIC
CIA
PLA
Memory and I/O
Cartridge / mapper behavior
Added improved cartridge-side tracing helpers for mapper, line, memory, and bank activity
Continued cartridge persistence support work for mappers that require saved EEPROM/flash-style state
Extended internal save-state coverage for more runtime state
Changed
Continued refinement of VIC-II emulation
Improved raster IRQ handling and related timing behavior
Refined display progression, badline-related handling, and raster-driven internal VIC state
Continued work on sprite DMA and bus arbitration behavior
Improved cartridge/memory interaction paths for mapper-controlled behavior
Continued development of IDE64 support, including controller/register groundwork and RTC-related work
Continued work toward more accurate IEC bus and disk-drive emulation
Improved monitor/debug workflows with more granular tracing controls
Fixed
Fixed multiple raster IRQ and VIC-related issues discovered during compatibility testing
Fixed save/load problems caused by stale or missing runtime state
Fixed issues affecting successful state restore in some scenarios
Fixed watch/monitor behavior regressions in debugging workflows
Corrected a VIC regression in display/counter progression logic that could break game rendering/loading behavior
Corrected issues introduced during register-write and tracing-related refactors
Improved
Better diagnostics for difficult game-specific issues
Better visibility into PLA mode changes and memory resolution
Better visibility into memory-mapped I/O behavior
Better mapper debugging for cartridge banking and control-line changes
Improved confidence when isolating regressions through internal tracing and testing
Mapper and cartridge work
Continued refinement of cartridge mapper support and behavior
Ongoing work across supported mapper types, including improvements around:
Ocean
Action Replay variants
Retro Replay
GMOD2
IDE64
Improved handling for mapper-controlled windows, bank behavior, and persistence-related state
Save state / load state
Expanded serialization coverage for runtime emulator state
Improved restoration of derived internal state after loading
Reduced load-state failures caused by unsaved transient data
Continued stabilization of chunk-based save-state behavior across subsystems
Compatibility notes
This is still an alpha build
Compatibility continues to improve, but some games and hardware edge cases may still be inaccurate
Timing-sensitive VIC, IRQ, cartridge, and drive behavior is still under active refinement
Developer notes
A major focus of this release was improving the emulator’s internal debugging and tracing infrastructure while continuing to push hardware accuracy forward. This release also included real regression hunting and correction in VIC behavior, which helped restore proper game behavior after recent refactors.

Download: Commodore 64 Emulator v0.7.9-alpha
Source: Here