Vol.5 n°1 january 1980

Vol.5 n°1 january 1980

p.3 In the Queue (table of contents)

Foreground

p.28 COMPUTERIZE A HOME

Controlling appliances in your home is one of the many chores that may be delegated to a personal computer. One product that is readily available is the Sears Home Control System used in this months Garcia's Circuit Cellar.

[author : Steve Ciarcia]

p.56 A COMPUTER-CONTROLLED LIGHT DIMMER, PART 1: DESIGN

You can use your computer in conjunction with programmable timers to easily control a light dimmer. Since programmable timers simplify both hardware and software in such applications, you may think of other applications.

[author : John H Gibson]

p.74 A FURNACE WATCHDOG

January is a month in which most of us show a greater than average concem for the state of our own home heating systems. Alter moving into a new house Theron decided to let his computer keep track of the furnace.

[author : Theron Wierenga]

p.122 TELEPHONE DIALING BY COMPUTER

Your computer can ease the burden of remembering and dialing telephone numbers. This computer-controlled interface can dial your most frequently used numbers on Touch Tone telephone systems.

[author : Edward Joyce]

p.130 (p.129) ANALYSIS OF POLYNOMIAL FUNCTIONS WITH The TI-59 CALCULATOR, PART 2

Thia article describes the operation of the polynomial evaluation programs for the TI-59 given in part 1. One program calculates the roots of a sixth-order polynomial, while the other produces a plot of the function on the TI PC-100C printer.

[author : Pierre Chance]

p.156 ALPHA LOCK FOR YOUR ASCII KEYBOARD

This article presents a method to produce only uppercase letters from a keyboard capable of both uppercase and lowercase operation. Control and special characters are not shifted, and the shift lock can be easily turned off.

[author : Terry Conboy]

p.180 RELOCATING 8080 SYSTEM SOFTWARE

The ability to relocate programs in memory space is often helpful when you are changing from one system to another, or adding a new program to your present system. John discusses some of the problems that are encountered during relocation on the 8080 microprocessor and gives two programs that perform most of the work.

[author : John Lipham]

p.212 EIGHTEEN WITH A DIE, A LEARNING GAME PLAYER

People learn from their mistakes. Computers can too if given the right program. Russeil enabled his personal computer to learn how to win a simple game by writing the program described in this article.

[author : Russell R Yost]

Background

p.20 MAKING COLOR SLIDES WITH AN INTECOLOR MICROCOMPUTER

An Intecolor intelligent color terminal (or other color-based computer) is used to generate color images that can be directly photographed. Slide production from a video image is relatively cheap, and the image can be altered during the design process with a minimum of effort.

[author : Alan W Grogono]

p.100 WHAT COMPUTERS CANNOT DO

Designers constantly try to build better and faster computers. Recent technology has produced many advances, but the question remains, "Is computing qualitatively better than when it first began?" T G Lewis discusses this issue,

[author : T C Lewis]

p.118 INDIRECT ADDRESSING FOR THE 6502

The 6502 processor allows the user to perform certain indirect addressing operations. However, indirect addressing is not available for all instructions, Kenneth informs us of an easy way to perform indirect addressing on the 6502 when it is not normally availahle.

[author : Kenneth Skier]

p.138 (p.136) THE PLOT CONTINUES

The plotter described in this article is capable of being run by hardware and software drivers and gets around some of the phyaicai difficulties, such as large torque and wobble factors, that confront some plotter designs.

[author : Leslie B Walter]

p.160 A COMPUTER-GENERATED REMINDER MESSAGE

This article describes a system that can help you to remember important future events. The system, called Tickler, is helpful in remembering to perfonn actions that have to be repeated periodically.

[author : E M Pass]

Nucleus

p.6 Editorial

The Era of Off-the-Shell Computers Has Arrived

p.14 Letters

p.115 BYTE News

p.148, 151 Technical Forum

Aids to the Direct Reception of Weather Satellite Photographs

An Improved Maze Program

p.174, 206 Programming Quickies

A Pascal Checkbook Balancing Program

A French-English Dictionary

Z80 User Stack Emulation

p.176 Book Reviews

p.194 Clubs and Newsletters

p.195, 199 BYTE's Bugs

p.196, 150 BYTE's Bits

p.200 Event Queue

p.230 What's New?

p.271 Unclassified Ads

p.272 Reader Service, BOMB

p.28 ON THE COVER

The theme of this issue's cover illustration is "the domesticated computer." Robert Tinney has taken the idea of the remote controlled appliances suggested by Steve Ciarcia's article on page 28 and combined it with some imaginative cabinetry in a household setting. In the process, Robert used his artistic license to employ radio imagery with antennae and aetheric airbrushing as an alternative to ultrasonic techniques described by Steve. Either way, practical means of safely controlling 110V appliances from the computer with total electrical isolation now exist - both for the homebrewer and as practical products advertised in this issue.