Foreground p.10 THE TOY STORE BEGINS AT HOME. [author Steve Ciarcia] Build a challenging musical game in BASIC p.26 SIMULATING PHYSICAL SYSTEMS. The Two-Dimensional Ideal Gas [author Mark Zimmennann] Experiment with physical models on your computer p.46 SOURCES OF NUMERICAL ERROR [author Daniel R Buskirk] Learn how to control errors from rounding and truncating p.84 MARSPORT: The Three-Dimensional Celestial Mechanics Simulation for the HP 67/97. [author D D Hinrichs] Pilot a spaceship to a soft landing on the Martian surface p.110 STANDARD DATA ENCRYPTION ALGORITHM. Part 2: Implementing the Algorithm [author R V Meushaw] The Standard Data Encryption Algorithm on a KIM-1 computer. Part 2 of two parts. p.132 QUEUING THEORY. Part 1: Queue Representation [author Len Gorney] Waiting lines are so important that an entire area of mathematics is devoted to their study p.176 THE POWER OF THE HP-67 PROGRAMMABLE CALCULATOR, Part 2 [author Robert C Arp, Jr] An example solution of simultaneous equations Background p.20 CROSS-POLLINATING THE APPLE II [author Richard Campbell] Add an Intel 8251 programmable communications interface p.54 SMART MEMORY, Part 1 [author Randy C Smith] The concept of a…