Black-Scholes Vs. Black Model in OptionStation?

[Michael Chen <mchen@xxxxxxxxxxxx>]

Hi all,

What are the differences between the Black-Scholes and the Black model
used in the OptionStation? The menu said the default one for stocks and
indces is Black-Scholes model, and Black model if for futures. I could
found the Black-Scholes model in the text books, but not the Black
model. Could someone help me on this? 

I have done some tests. The Black-Scholes yeilds big differeces on the
futures (tends to over-valued againts real market price). 

Thanks,

Michael Chen