Your version of the file might be an older "bad dump." Ensure the CRC32 matches 2d093304 .
Since BIOS files are copyrighted material, they are not hosted on the official MAME website. Users typically find them on archival sites such as the Internet Archive or community-vetted ROM repositories like MAME Pro or those discussed on Reddit's r/MAME . epr-14869b.25 download
Instead of searching for the single file, it is more effective to download the full model1io.zip BIOS set, which usually contains epr-14869.25 , epr-14869b.25 , and epr-14869c.25 . Your version of the file might be an older "bad dump
In the world of arcade preservation, "EPR" refers to an chip found on physical arcade hardware. The epr-14869b.25 file is a 64KB digital dump of the BIOS used by the Sega Model 1 communication and I/O boards. Instead of searching for the single file, it
Some games require both the specific game ROM (e.g., vf.zip for Virtua Fighter) and the BIOS ROM ( model1io.zip ) to be present in the same folder.
Place the unmodified model1io.zip file into your MAME roms folder. Do not unzip the file; MAME reads the contents directly from the compressed archive.