Vol.5 n°5 may 1980

Vol.5 n°5 may 1980

p.3 In the Queue (table of contents)

Foreground

p.20 A DC-TO-DC CONVERTER

Here's a simple converter that uses a standard integrated circuit for producing a 25 mA bipolar source from a single-ended power supply.

[author : Michael Picco]

p.22 I/O EXPANSION FOR THE RADIO SHACK TRS-80, Part 1: Principles of Parallel Ports

This month Steve explains the operation of parallel input/output as a prelude to next month's design for an economical RS-232C interface.

[author : Steve Ciarcia]

p.44 KIMDOS, Using Your KIM-1 with a Percom Floppy-Disk Drive

Using the LFD-400 disk-controller board, the KIM-1 can access up to 87.5 K data bytes on several 5-inch hard-sectored floppy-disk drives.

[author : Joel Swank]

p.72 INTERFACE A FLOPPY-DISK DRIVE TO AN 8080A-BASED COMPUTER

Building a disk-controller board for a Shugart SA400 disk drive can be done easily and with commonly available parts.

[author : John Hoeppner]

p.196 GIVE YOUR COMPUTER AN EAR FOR NAMES

With the Soundex code, you can locate people's names in your data base by similar, but not exact, spellings.

[author : Tom Munnecke]

p.214 THE COSMAC DOODLER

An electronic sketchpad? Even a small system like the COSMAC ELF can draw designs using a video display.

[author : Jeff Duntemann]

p.250 ERROR CHECKING AND CORRECTING FOR YOUR COMPUTER

Storage devices can introduce data errors. The system presented here can increase reliability and speed of these peripherals.

[author : Gregory J Walker]

Background

p.12 THE CASSETTE LIVES ON, An Alternative to Floppy-Disk Mass Storage

Floppy disks may be the glamorous way to store programs and data, but the cassette is far from obsolete.

[author : Emory Cook]

p.104 A GRAPHICS TEXT EDITOR FOR MUSIC, Part 2: Algorithms

The conclusion of this article sets forth the routines to create and use the various arrays described in part 1.

[author : Randolph Nelson]

p.120 USING THE COMPUTER AS A MUSICIAN'S AMANUENSIS, Part 2: Going from Keyboard to Printed Score

Part 2 continues the examination of the subtle problems encountered when translating information from performance to written score.

[author : Jef Raskin]

p.130 COMPARING FLOPPY-DISK DRIVES BY SOFTWARE SIMULATION

Now you can get some idea of the relative performance of different units by simulating their mechanical functions in a BASIC program,

[author : Dennis Nendza]

p.202 THE CLUB COMPUTER NETWORK

If your club is considering to form a program- and data-exchange network, the telephone and amateur radio links described here will be a valuable source of ideas.

[author : Joe Kasser]

Nucleus

p.6 Editorial: Computer-Controlled Viewing of the 1980 Eclipse

p.8 Letters

p.144 BYTELINES (formerly BYTE News)

p.152 Technical Forum

Simplifying the Curve-Plotting Calculation by Geometric Means

Alpha Locking in Software

Maintaining a Single Exit Point

p.190 Programming Quickies

Decisions, Decisions

Formatted Program Output for the KIM-1

p.226 Book Reviews

p.230 Clubs and Newsletters

p.234 BYTE's Bits

p.236 BYTE's Bugs

p.238 Event Queue

p.280 NCC Information

p.286 What's New?

p.335 Unclassified Ads, BOMB Results

p.336 Reader Service, BOMB

ON THE COVER

On May's cover, Robert Tinney has formed an abstraction of the most important medium of mass storage in today's era of small computers, the floppy disk. Heightening its shimmering mystery, we find a disk wavering in the heat above some desert landscape. To enlighten you, this issue features several articles that present valuable information about floppy-disk technology. This technology is no mirage - it will even work well in a similar, hot environment of East Africa, as the editorial describes.