of the original hardware’s Read-Only Memory. When sourced correctly (often requiring a 128KB file size), they offer perfect compatibility.
When the motherboard BIOS transfers control to this option ROM during POST (at INT 0x19 execution), the CD boot ROM: bios-cd-u.bin bios-cd-e.bin bios-cd-j.bin
For most modern emulation setups, these files must be placed in a specific "system" or "BIOS" directory: : Files typically go into the /system folder. of the original hardware’s Read-Only Memory
Are you having trouble getting a to recognize these files? bios-cd-u.bin bios-cd-e.bin bios-cd-j.bin