Features p.26 The Santa Cruz Open: Othello Tournament for Computers [author Peter W Frey] One of the surprises was the impressive showing of the microcomputers and hand-held electronic units. p.38 Build a Z8-Based Control Computer with BASIC, Part I [author Steve Ciarcia] Zilog's new single-chip microcomputers ease the construction of a small, inexpensive computer system. p.48 Harvesting the Sun's Energy [author George E Mobus] A computer model helps determine the amount of solar energy received by a flatplate collector. p.94 What Time Does the Sun Rise and Set? [author Bruce Barkstrom] This sunrise-sunset program calculates many parameters associated with the sun, including the amount of solar radiation received by the earth. p.136 Multiprocessing with Motorola's MC6809E [author Hunter Scales] The MC6809E microprocessor is designed for use in a multiprocessor system. p.158 Computer Simulation of a Solar-Energy System [author Daniel Doan] An electric-circuit model makes heat flow easier to understand. p.178 Energy Conservation with a Microcomputer [author David R Jackson and John M Callahan] The principles of energy conservation can be applied to your home using a program written i…