72    Securities and Options 
12c platinum / 12C 
RPN KEYSTROKES
DISPLAY 
12c platinum 
ALG KEYSTROKES 
DISPLAY 
 
 
?6          
101,   44   6
 
 
O 
102,       35
 
 
?5          
103,   44   5
 
 
~ 
104,       34
 
 
g(037    
105,43,33,037
 
 
~ 
106,       34
 
 
:$ 
107,   45  13
 
 
?-4      
108,44 30   4
 
 
§ 
109,       20
 
 
:3          
110,   45   3
 
 
- 
111,       30
 
 
:6          
112,   45   6
 
 
³ 
113,       36
 
 
?+4      
114,44 40   4
 
 
:4          
115,   45   4
 
 
~ 
116,       34
 
 
?5          
117,   44   5
 
 
g(000      
118,43,33,000
 
 
fs 
 
 
 
 
REGISTERS 
 
n: Term to expiry i: Interest rate (%)  PV: Stock price  PMT: Volatility (%) 
FV: Strike price  R
0:
 Unused  R
1
: Unused  R
2
: Unused 
R
3
: N(d
1
) R
4
: Put value  R
5
: Call value  R
6
: Q·N(d
2
) 
R
7
-R
.9
: Unused       
 
Note: The n, i and PMT values must all be based on the same time unit (for example: n is 
measured in years or months and  i and PMT are rates per year or per month). i is a  
continuous percentage rate.  PMT is the standard deviation of the continuous percentage 
stock return (as observed over the time unit).  For sensible output, all inputs should be 
positive. The PMT=0 case can be simulated by using a PMT arbitrarily close to 0. 
 
Program Instructions 
1.  Key in the program. 
2.  Enter the five inputs into the five financial registers. These values are preserved by the 
program. 
 
a. Key in the unexpired term of the option and press n. 
 
b. Key in the risk-free interest rate as a percentage and press ¼. 
 
c. Key in the current (or spot) stock price and press $. 
 
d. Key in the volatility assumption as a percentage and press P. 
 
e. Key in the strike price and press M. 
3. 
Press R/S. The Call value is displayed. Press ~ to see the Put value.