Vol.5 n°6 june 1980

Vol.5 n°6 june 1980

p.3 In the Queue (table of contents)

p.3 In the Queue (table of contents)

Foreground

p.24 AN ANSWER/ORIGINATE MODEM

p.24 AN ANSWER/ORIGINATE MODEM

Construction from precalibrated modules that eliminate the need for complicated adjustments makes this modem a practical project for the homebrewing hobbyist.

[author : Ronald G Parsons]

p.42 I/O EXPANSION FOR THE TRS-80, Part 2: Serial Ports

p.42 I/O EXPANSION FOR THE TRS-80, Part 2: Serial Ports

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.

[author : Steve Ciarcia]

p.64 Z80 OP CODES FOR AN 8080 ASSEMBLER

p.64 Z80 OP CODES FOR AN 8080 ASSEMBLER

Using predefined variable names, you can generate proper Z80 machine-language code.

[author : William T Powers]

p.96 COMMUNICATING IN TWO DIRECTIONS

p.96 COMMUNICATING IN TWO DIRECTIONS

With proper transmission lines, extra terminals can make your personal computer flexible and easy to access from many locations.

[author : Mark R Tichener]

p.122 A TIME-SHARING/MULTI-USER SUBSYSTEM FOR MICROPROCESSORS

p.122 A TIME-SHARING/MULTI-USER SUBSYSTEM FOR MICROPROCESSORS

This minimal hardware/software system shows that running multiple users on microcomputers is a simpler task to implement than most think.

[author : Don Kinzer]

p.140 A TELEPHONE-DIALING MICROCOMPUTER

p.140 A TELEPHONE-DIALING MICROCOMPUTER

Automatic telephone dialing can be done by two diverse methods.

[author : John Renbarger]

Background

p.88 MY TRS-80 TALKS TO MY CROMEMCO Z-2

p.88 MY TRS-80 TALKS TO MY CROMEMCO Z-2

Peripherals that were once dedicated to a single computer can now be shared by using this communications scheme.

[author : Rod Hallen]

p.108 UNDERSTANDING ISAM

p.108 UNDERSTANDING ISAM

Some microcomputers can use the indexed-sequential access method, known as ISAM, instead of random access or sequential access.

[author : Reginald D Gates]

p.214 INTERPERSONALIZED MEDIA: WHAT'S NEWS?

p.214 INTERPERSONALIZED MEDIA: WHAT'S NEWS?

Decreasing costs and increasing availability of telecommunication facilities for microcomputers imply modes of communication vastly different from the ones we use today.

[author : James A Levin]

p.230 FIFTEEN: A GAME OF STRATEGY (OR TIC-TAC-TOE REVISITED)

p.230 FIFTEEN: A GAME OF STRATEGY (OR TIC-TAC-TOE REVISITED)

This is a Nim-like game in which players try to pick numbers that will add up to 15.

[author : John Rheinstein]

Nucleus

p.6 Editorial: The Grass Roots Electronic Post Office...

p.6 Editorial: The Grass Roots Electronic Post Office...

p.12 Letters

p.12 Letters

p.84, 212, 228 BYTE's Bits

p.84, 212, 228 BYTE's Bits

p.86 Ask BYTE

p.86 Ask BYTE

p.136 Book Reviews: The Network Nation: Human Communications via Computer

p.136 Book Reviews: The Network Nation: Human Communications via Computer

p.174 BYTELINES (formerly BYTE News)

p.174 BYTELINES (formerly BYTE News)

p.182 BYTE's Bugs

p.182 BYTE's Bugs

p.186 BYTE's Bits: Bills Introduced in Congress

p.186 BYTE's Bits: Bills Introduced in Congress

p.196 Technical Forum

p.196 Technical Forum

A Race-Car Monitoring Program

Computing Time Between Dates

p.204 Event Queue

p.204 Event Queue

p.210 Clubs and Newsletters

p.210 Clubs and Newsletters

p.238 Languages Forum: Comment and Correction for Mouse

p.238 Languages Forum: Comment and Correction for Mouse

p.242 What's New?

p.242 What's New?

p.287 Unclassified Ads, BOMB Results

p.287 Unclassified Ads, BOMB Results

p.288 Reader Service, BOMB

p.288 Reader Service, BOMB

ON THE COVER

On this month's cover, Robert Tinney has created a visual fantasy on a communications theme. Imagine a network of personal computers where each person's computer is a node. Each node can display some information about the network. The fantasy cover painting shows several such personal computers in a matrix of translucent network connections. A few message packets are in transit down gossamer conduits, and each computer shows a view of the network from that node's vantage point. As noted in this month's editorial, the real-world equivalent of this fantasy is the telephone network with low-speed modem equipment. While 300 bps is not the data communications equivalent of the bandwidth of a light beam, it is a good start which exists today. The nodes we know about via modems and telephones consist of our personalized directories of public access and private computer systems.