Ymir Version Control Update (June 20, 2026)

The Ymir Git emulator for Sega Saturn was released on June 20, 2026. This work-in-progress emulator supports game loading from various file formats (BIN+CUE, IMG+CCD, MDF+MDS, ISO) and features automatic IPL ROM detection and region switching. Players can enjoy up to two players with customizable keybindings, backup RAM options, save states, and a one-minute rewind feature at 60 fps. The latest changelog includes bug fixes and enhancements in CD Block HLE, SH2 clock accuracy, and various utilities. The emulator aims for improved performance and stability through ongoing updates. Download it at the provided source.

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Ymir Git (2026/06/20) has been released. This is an in-progress Sega Saturn emulator.

Key Features:
Load games from BIN+CUE, IMG+CCD, MDF+MDS, or ISO files
Automatic detection of IPL (BIOS) ROM
Automatic region switching
Supports up to two players using standard Control Pads on both ports (with more features coming)
Completely customizable keybindings
Backup RAM and DRAM cartridges (additional features forthcoming)
Built-in backup memory manager for importing and exporting saves, allowing transfers between internal and cartridge RAM
Save states functionality
Rewinding capabilities (up to one minute at 60 fps), turbo speed, and frame stepping (both forwards and backwards)
A feature-rich debugger currently in progress

Ymir Changelog:
* fix(cdblock-hle): Extend sizes of Mode 2 Form 2 sectors read from disc when sector length is less than 2324 bytes
* fix(cdblock-hle): Resolve handling of “Seek Disc” command parameter exceptions
* docs: Additional game fixed due to recent CD Block HLE fixes
* docs: Update CHANGELOG to include one more fixed game
* feat(SH2): Improve accuracy and flexibility by using ratio for SH2 clock factor
* chore(settings): Ensure SH2 clock factor is displayed in tweaks list
* chore: Clean up includes in emu_event_factory.cpp
* feat(utils): Introduce optional value constraint function to Observable
* chore(settings): Set and use defaults and limits for SH2 clock ratio setting
* chore(VDP): Separate phase devlog groups into horizontal and vertical
* feat(utils): Add Ratio type for future implementation
* chore(utils): Prevent write access to values within Observables
* chore(SH2): Change “overclock factor” to “clock factor” to reflect underclocking capabilities
* feat(SH2): Enable underclocking for SH2s
* docs: Senken Kigyouden is the Japanese release of Xianjian Qixiazhuan
* fix(SCSP): Redesign and simplify threading synchronization
* docs: Yet another game resolved through recent CD Block HLE adjustments
* feat(sandbox): Speed up tests, reducing needed frame runs
* feat(sandbox): Implement SCSP deadlock tester
* docs: List additional games resolved by recent CD Block HLE modifications