Hmmm...are there EPROM's in it, or ROMs? I built a PC compatible with a bare board and stuffed the chips and soldered it when I was broke in college. The BIOS it came with wasn't very PC compatible. So (and I'm not making any excuses for this..) I wrote a program in disk based GW-BASIC (I actually BOUGHT it) that looked like it did something when in reality it was writing 2048K ROM images of the BIOS and BASIC ROMS of a real IBM PC to floppy. I took it to an IBM store (IBM had "stores" then) and told the salesman that I wanted to know if my program would really run on an IBM PC/XT. I ran it, it "worked", I said, "thank you very much", went to work, blew the EPROMS, stuffed 'em in my motherboard, and then, my PC, although it had a wooden case and a power supply shielded with Erector Set parts, was really, really, definitely IBM PC compatible!!