Nothing like vacation to clear the "stupid things TODO backlog". After so many years without doing any program for the HP-12C, I put together a program that calculates calls and puts using Black-Scholes. (Sorry, no greeks yet! Probably will never have greeks, save for a Platinum version, since the Platinum has 400 programming steps.)
FWIW, it can be found at http://epx.com.br/ctb/bs12c.php.
