Furthermore, the preservation scene is now pushing for "Redump" verified BIOS sets. The holy grail is finding a v1.00 US BIOS versus the common v1.01, as certain prototype discs only boot on the older firmware. sega-101.bin (v1.01) is the standard, but sega-100.bin (v1.00) is the collector's item.
These BIOS files are . You must dump them from original hardware you own. They are not open source or freely distributable. sega-101.bin mpr-17933.bin