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Ymir Git (2026/04/04) is a work-in-progress Sega Saturn emulator offering features such as loading games from various formats (BIN+CUE, IMG+CCD, MDF+MDS, ISO), automatic BIOS detection, and region switching. It supports two players with customizable keybindings, backup RAM management, and save states, as well as advanced functionalities like rewinding, turbo speed, and a debugger. Recent updates include fixes for VDP2 and VDP1 errors, enhancements in input reading and debug usability, and documentation improvements. The emulator aims to enhance the gaming experience while continually developing its capabilities.
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Ymir Git (2026/04/04) has been released. It is an ongoing project for a Sega Saturn emulator.
Key Features:
Load games from BIN+CUE, IMG+CCD, MDF+MDS, or ISO formats
Automatic detection of IPL (BIOS) ROMs
Automatic switching of regions
Support for up to two players using standard control pads on both ports (more features coming soon)
Comprehensive keybinding customization
Support for backup RAM and DRAM cartridges (with more features on the way)
Built-in memory manager for save import/export and transfers between internal and cartridge RAM
Save states functionality
Rewind capability (up to one minute at 60 fps), turbo mode, frame stepping (both forwards and backwards)
An evolving and feature-rich debugging tool
Ymir Changelog:
* debug(VDP2): Display scroll values and resolution in VDP2 layer parameters view
* chore(VDP2): Document bit widths for additional variables
* fix(VDP2): Correct VCNT offset in save states
* feat(input): Direct input reading from gamepads instead of relying on events
* fix(swrenderer): Resolve rare race conditions when swapping VDP1 framebuffers
* fix(VDP1): Prevent infinite loops during command processing with address assignment
* fix(VDP1): Correct timings for erase register latching
* test(VDP2): Add test case for Rayman VRAM access patterns
* fix(VDP2): Address illegal CP accesses causing delays in all VRAM banks, not just the affected ones
* test(VDP2): Introduce a smoke test harness for VRAM access patterns
* chore(VDP2): Document registers utilized by `CalcAccessPatterns` and `CalcVCellScrollDelay`
* fix(VDP2): Accurately store accesses of rotation coefficients
* chore(VDP): Relocate internal VDP2 state out of the renderers
* chore: Add missing comment marker
* feat(debug): Multiple usability enhancements to the Follow PC option in the disassembly view
