Geargrafx is awesome retroarch core for these systems. Its accurate, fast and supports retroachievements.
OK cool. Looks like it’s here: GitHub - drhelius/Geargrafx: PC Engine / TurboGrafx-16 / SuperGrafx / PCE CD-ROM² emulator, debugger, and embedded MCP server for macOS, Windows, Linux, BSD and RetroArch. · GitHub