Not as sure on the differences between the very old and the v2.112 versions. Will have to look more into this (or maybe Italo can chime in?) and look more at the documentation and vsig files. My guess is a few modules and some bug fixes?
Here are the later differences, I believe between v2.112 through v2.300…
Supposedly the last “standard” OS version was v2.112 for the DSP4000 and v2.200 for the DSP4500.
v2.158 was a special ROM included with the Alchemy cards.
v2.300 was a special ROM included with the Ultrashifter cards.
