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The entire ML4.1 code is outside. Anyway I don't keep it, I just re-use some of their routines (map access, math library).
The ML4.1 schematic is in the File section of Alfa75 Yahoo newsgroup. It's derived from the Opel ML4.1 schematic).
I would say ML3.1 was a trial, ML4.1 was one of first ECUs of the 8052 architecture which is based on the 60-2 pulley (BMW, Porsche, Alfa, Peugeot GTI, Opel (GM) 2L GSI). The difference is in this 60-2 pulley and the way it's used.
The ML3.1 firmware was much simpler but most of basic routines were the same, except the ignition management.
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