Download the recommended custom patch set from the 68kMLA forums. Using a hex editor (like HxD on Windows or Hex Fiend on macOS), apply these changes to your quadra800.bin :

This specific architecture unlocks the ability to boot advanced legacy operating systems, including:

The "Quadra800ROM work" encompasses several key areas of enthusiast development, aimed at modifying how the machine starts up and operates. A. ROM Debugging and Patching