Foreground p.24 AN ANSWER/ORIGINATE MODEM [author Ronald G Parsons] Construction from precalibrated modules that eliminate the need for complicated adjustments makes this modem a practical project for the homebrewing hobbyist. p.42 I/O EXPANSION FOR THE TRS-80, Part 2: Serial Ports [author Steve Ciarcia] Along with a discussion of the theory of serial I/O ports, here's a design for an economical RS-232C interface that is compatible with standard TRS-80 software. p.64 Z80 OP CODES FOR AN 8080 ASSEMBLER [author William T Powers] Using predefined variable names, you can generate proper Z80 machine-language code. p.96 COMMUNICATING IN TWO DIRECTIONS [author Mark R Tichener] With proper transmission lines, extra terminals can make your personal computer flexible and easy to access from many locations. p.122 A TIME-SHARING/MULTI-USER SUBSYSTEM FOR MICROPROCESSORS [author Don Kinzer] This minimal hardware/software system shows that running multiple users on microcomputers is a simpler task to implement than most think. p.140 A TELEPHONE-DIALING MICROCOMPUTER [author John Renbarger] Automatic telephone dialing can be done by two diverse methods. Background p.88 MY TRS-80 TALKS TO MY CROMEM…