How to Use This Book  xi 

Section 1  APPLICATIONS PROGRAMS  
Practical uses at home or work. 

BIORYTHM  3 
Can you predict your good and bad days? 

CHECKBOOK  11 

DECIDE  21 
Choose the best decision from your list of alternatives. 

LOAN  33 
Calculate payments and interest for mortages, car loans, etc. 

MILEAGE  41 
Analyze your car's gasoline usage. 

QUEST/EXAM  49 
Determine the results of questionnaires and examinations. 


Section 2  EDUCATIONAL PROGRAMS  
To help yourself or others to learn. 

ARITHMETIC  61 
Math drills for schoolaged children. 

FLASHCARD  69 
Create your own flascards, then practice. 

METRIC  79 

NUMBERS  87 
Help preschool children to learn numbers. 

TACHIST  93 
Increase your reading speed with this tachistoscope. 

VOCAB  101 


Section 3  GAME PROGRAMS  
Match wits with the computer or a friend. 

DECODE  111 
Figure out the computer's secret code. 

GROAN  119 
This dice game will make you do just that. 

JOT  127 
Challenge the computer to this word and logic game. 

OBSTACLE  137 
Play a friend at this arcardelike game. 

ROADRACE  145 
Try to keep the car on the road. 

WARI  153 
Attempt to beat the computer on this ancient African skill game. 


Section 4  GRAPHICS DISPLAY PROGRAMS  
Dazzling visual diversions. 

KALEIDO  165 
A kaleidoscope with eight point symmetry. 

SPARKLE  169 
Hypnotic sparkling patterns. 

SQUARES  173 
Overlaying concentric squares. 

WALLOONS  177 
A classic from the TRS80 Theatre. 


Section 5  MATHEMATICS PROGRAMS  
For math, engineering, and statistical uses. 

CURVE  185 
Perform leastsquares curve fitting. 

DIFFEQN  195 
Solve ordinary differential equations. 

GRAPH  205 
Display simple graph of a function. 

INTEGRATE  213 
Determine the area under a curve. 

SIMEQN  221 
Solve simultaneous linear equations. 

STATS  227 
Performa standard "statistics of population" calculations. 


Section 6  MISCELLANEOUS PROGRAMS  
Short programs that do interesting things. 

BIRTHDAY  243 
What are the odds of identical birthdays in a group of people? 

PI  247 
Calculate an approximation of pi. 

POWERS  253 
Calculate powers of integers  up to 250 digits long. 

PYTHAG  259 
Generate Pythagorean triplets (a²+b²=c²). 


Appendix 1  MEMORY USAGE  263 

Bibliography  265 