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]
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]
Using predefined variable names, you can generate proper Z80 machine-language code.
[author : William T Powers]
With proper transmission lines, extra terminals can make your personal computer flexible and easy to access from many locations.
[author : Mark R Tichener]
This minimal hardware/software system shows that running multiple users on microcomputers is a simpler task to implement than most think.
[author : Don Kinzer]
Automatic telephone dialing can be done by two diverse methods.
[author : John Renbarger]
Peripherals that were once dedicated to a single computer can now be shared by using this communications scheme.
[author : Rod Hallen]
Some microcomputers can use the indexed-sequential access method, known as ISAM, instead of random access or sequential access.
[author : Reginald D Gates]
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]
This is a Nim-like game in which players try to pick numbers that will add up to 15.
[author : John Rheinstein]
A Race-Car Monitoring Program
Computing Time Between Dates
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.