I got some Mega-CD and Sega CD bios files from a Genesis No-Intro ROM set, all of them are labeled with version numbers such as v1.00, v1.10 and v2.00, this itself should be self explanatory.
Some of them however come with a letter:
[BIOS] Mega-CD Model 1 (Japan) (v1.00P)
[BIOS] Mega-CD Model 1 (Japan) (v1.00S)
[BIOS] Sega CD Model 2 (USA) (v2.00W)
What exactly do the letters P, S and W mean? It's a mystery that's been bothering me for quite a while.
A question about Mega-CD/Sega CD version numbers.
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