Black-Scholes program for HP 12C calculator

I recently discovered this paper:

I thought it was worth sharing.

It specs out a program for the HP 12C calculator which calculates European call and put prices and implied vols of European call options.  And also outputs vega and the deltas of the call and put as if that wasn’t already enough.  I find it nothing short of amazing that something like this is possible on the 12C.

Sometimes you have to just stand back and applaud genius.  Tony Hutchins and Dr. Peter Carr, I salute you.