(Note: some surface mount dual inline versions of the 27C160 are 44-pin, having 2 additional pins added to the left side that are not found on the DIP version - these 2 pins have no connection). Finding the correct BIOS files for this through search engines and forums is a pain in the ass, so I figured I’d post up a zip I’ve compiled of the correct OpenEmu Sega Saturn BIOS files needed for US, EU and JPN region games. This time for Sega’s classic 32-bit console, the Sega Saturn. These pins are extra address pins - you could probably just ground them to make it backwards compatible with the other versions. Hey guys, here’s another pack of bios files for OpenEmu. If you can't find these chips, Jameco has a 27C160, which has the same pinout, except that it's a 42-pin chip instead of a 40-pin chip, so it has 2 additional pins on the left side (the side with the "U" indention). They are different from the 27C2048 and the 27C4096 because the 272048/274096 are strictly 16-bit, while the 27C2100 and the 27C4100 can be switched between 8-bit and 16-bit (there's a BYTE' line that selects Words if HIGH and Bytes if low - when in 8-bit mode, bits 8-14 on the data bus go to high-impedance and bit 15 allows you to choose the upper or lower byte of the address to be spit out of bits 0-7). These EPROMs should be available through some distributors. I believe the 27C200 to be equivalent to the 27C2100 (and the 27C400 equivalent to the 27C4100). There are a few SEGA-CD games Id love to get my hands on, but I REALLY dont wanna have to go out of my way to buy a SEGA-CD console just to dump its BIOS, and being the legit gamer I wanna be, I refuse to download the official BIOS.
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