My apologies if this is not the right spot for this post. I am new to emulation and these forums, so please forgive me if this is not how I should be going about finding particular files.
I am looking for a bios file, coh1002m, that includes the file 78081g503.ic655. I have tried to exercise my own due diligence in finding this particular bios, but have come up short. Now to be completely honest, I am really unsure the proper way of going about finding a particular file. My Google searches have led me to forums where people have asked about this file, and they are directed to coh1002m. Even the database shows that 78081g503.ic655 is one of three files in coh1002m. However, the only coh1002m that I have encountered contain 2 files, and neither of them are the file that I'm seeking.
I've also researched this bios and apparently coh1002m was once the tps bios up until MAME 178. So I tried looking at all the updates from that version on to see if 78081g503.ic655 is added, but I still come up with nothing. Likewise, I read that 78081g503.ic655 was also apart of the cpzn2 bios which became coh3002c on MAME 178. I have also looked into that bios file as well but the 78081g503.ic655 is not there. A forum post also indicated that as of MAME 181 78081g503.ic655 was in both bios files, coh1002m and coh3002c. However, I have not been able to locate either of those bios files that contain 78081g503.ic655.
So what would be the proper method of finding the file that I'm searching for? Likewise, is there a resource that would tell me if it simply is just not available? I don't know if I'm just blindly searching for a file that no one has.
Please remember that I am brand new to emulation, and I'm not really tech savvy, so any suggestion or information, no matter how simple or basic, would greatly help me.
Thank you all so much.