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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
Click on a see also (sa) or tracing (xx) to view detailed entries about a related subject.
The entries are in alphabetical order by magazine name and then in chronological sequence.
To obtain a copy of any magazine article contact your local public library or the publisher.

sa   MODEM

Audio basics. Pulse code modulation (PCM). An introduction to the techniques for sending analog information using a digital binary code. Part 1.
AUDIO AMATEUR 3/1975 [Jan 1976] (v.6#3) pg. 22

Audio basics. Pulse code modulation (PCM). An introduction to the techniques for sending analog information using a digital binary code. Part 2.
AUDIO AMATEUR 4/1975 [Mar 1976] (v.6#4) pg. 30

Table of the complete 128 ASCII characters with their corresponding binary, octal, decimal and hexidecimal equivalents.
BYTE Feb 1978 (v.3#2) pg. 19

Transmission of digital data over twisted pair wires. Tips on eliminating induced noise when peripherals are a long distance from the computer.
BYTE Nov 1978 (v.3#11) pg. 136

Interface circuit for converting a 20mA current loop format to RS-232 format or to standard TTL format.
BYTE Feb 1979 (v.4#2) pg. 150

Hammering error correcting code can detect and correct errors which occur in strings. An introduction to the concept.
BYTE Feb 1979 (v.4#2) pg. 180

Communicate on a light beam. Circuits for sending data communications over a beam of laser light. Also involves the use of fiber optics for short distance transmission. Use to transmit digital information from a computer.
BYTE May 1979 (v.4#5) pg. 32
Correction BYTE Aug 1979 (v.4#8) pg. 194

The club computer network. A description of telephone and amateur radio links.
BYTE May 1980 (v.5#5) pg. 202

Error checking and correcting for your computer. A theoretical and practical look at error-trapping and correcting codes as developed by Richard W. Hammering (the Hammering codes).
BYTE May 1980 (v.5#5) pg. 250

My TRS-80 talks to my Cromemco Z-2. Use the RS-232 serial port and an assembler program to continually read the serial port and store the data as it is sent from one computer to the other.
BYTE Jun 1980 (v.5#6) pg. 88
Added Info BYTE Oct 1980 (v.5#10) pg. 18

Communicating in two directions. Access your computer from many locations by means of extra terminals and proper transmission lines.
BYTE Jun 1980 (v.5#6) pg. 96

Multimachine games. More exciting computer games involve two computers and two or more players. Describes the cable arrangement and software needed to connect two PET computers.
BYTE Dec 1980 (v.5#12) pg. 24

Build an intercomputer data link. Software for a 6800 based system allows it to communicate with other systems via a serial line.
BYTE Apr 1981 (v.6#4) pg. 252

Simplified circuit to communicate bidirectionally on a single line.
BYTE May 1981 (v.6#5) pg. 270

Circuit for a 300 bps serial-to-parallel converter.
BYTE Jul 1981 (v.6#7) pg. 212

Linking a Pascal Microengine to a Cyber 170. A file-transfer system to allow communication between two computers.
BYTE Nov 1981 (v.6#11) pg. 472

Terminal Apple with file transfer. Low-cost telecommunication capability for the Apple II. Turn an Apple II into a simple CRT terminal with these programs.
BYTE Jun 1982 (v.7#6) pg. 410

The personal computer as an interface to a corporate management information system. Designing an intelligent terminal interface program for the Apple II Plus computer. Written in Pascal.
BYTE Oct 1982 (v.7#10) pg. 315

Welcome to the standards jungle. An in-depth look at the confusing world of computer connections. Covers RS-232C, RS-336, RS-449, RS-422, RS-423, and current loop.
BYTE Feb 1983 (v.8#2) pg. 146

A smart terminal program for the TRS-80 Model III contains options for use with a printer and disk drives. Combined with the serial port option, it allows your TRS-80 to communicate over telephone lines.
BYTE Feb 1983 (v.8#2) pg. 458

UART circuit converts serial data for use by parallel devices.
BYTE Jul 1983 (v.8#7) pg. 501

Lmodem: a small remote-communications (smart-terminal) program for CP/M systems written in the BDS version of the C programming language.
BYTE Nov 1983 (v.8#11) pg. 410
Correction BYTE Apr 1984 (v.9#4) pg. 440

Circuit for serial to 20-mA loop conversion.
BYTE Dec 1983 (v.8#12) pg. 554

IBM/Apple communication. Sending text files between Apples and IBM PCs is easy with these simple programs (written in BASIC) via the serial I/O port and a null-modem cable.
BYTE Feb 1984 (v.9#2) pg. 331

Circuit for interfacing between the RS-422A and RS-232C standards.
BYTE Feb 1984 (v.9#2) pg. 444

Schematic for a device to convert BCD data to ASCII data and supply the data to a UART for transmission.
BYTE Apr 1984 (v.9#4) pg. 412

Kermit: a file-transfer protocol for universities. Part 1. Design considerations and specifications.
BYTE Jun 1984 (v.9#6) pg. 255

Kermit: A file-transfer protocol for universities. Part 2. States and transitions, heuristic rules, and examples.
BYTE Jul 1984 (v.9#7) pg. 143

Program to implement the "Break key" function on a Commodore 64 or VIC-20 computer.
BYTE Sep 1984 (v.9#10) pg. 48

Communications. Six articles. Looks at Ethernet, LANs, high-speed modems, communication programs and working with dial-up data bases and on-line searches.
BYTE Dec 1984 (v.9#13) pg. 129

Writing communications in BASIC. Easy terminal emulation and file transfer.
BYTE Dec 1984 (v.9#13) pg. 187

PC serial communications. Comparing RS-232 and RS-422 serial communication interfaces and an RS-232-to-RS-422 conversion circuit you can build.
COMPUTERCRAFT Sep 1991 (v.1#6) pg. 44

Build a data transceiver system that allows two computers separated by long distances to transmit and receive data over coaxial or twisted-pair cables at up to 9,600-baud.
COMPUTERCRAFT Dec 1991 (v.1#9) pg. 36

How to transfer files. Maximizing data transfers between two computers using both serial and parallel ports. Looks at pin assignments, null modem wiring, and software needs.
COMPUTERCRAFT Feb 1992 (v.2#2) pg. 32

XMODEM-CRC on the 8031. Implementing the XMODEM protocol on 8031-based microcontroller systems to achieve error-free data transfer to and from a host PC.
COMPUTERCRAFT May 1993 (v.3#5) pg. 61
Added Info COMPUTERCRAFT Oct 1993 (v.3#10) pg. 9

Build an RS-232 to RS-422 converter. Est. cost: $20.
COMPUTERCRAFT May 1993 (v.3#5) pg. 76

Cyber Key. Cybernetic key attached to the serial port on your computer performs several functions (limits outside access, provides data encryption, generates CRC and FEC codes for long-distance and wide-area networks, and converts printer control codes). Est. cost: $70.
COMPUTERCRAFT Aug 1993 (v.3#8) pg. 10

Wireless data links. Start of a series on wireless communnications in PC environments with the focus on low-cost options. Part 1. Deciding on a wireless system and a project that uses infrared energy to send and receive four bits of information at a time.
COMPUTERCRAFT Oct 1993 (v.3#10) pg. 30

Wireless data links. Part 2. Using the link for experiments in computer control and monitoring. Includes control of a 7-segment display, control of a stepper motor, switch monitor, etc.
COMPUTERCRAFT Nov 1993 (v.3#11) pg. 48

Wireless data links. Part 3. Techniques for increasing the range of an infrared link and an infrared link that connects to RS-232 serial ports.
COMPUTERCRAFT Dec 1993 (v.3#12) pg. 37

Six simple circuits for converting RS-232 or 20-mA loop into TTL and vice versa.
COMPUTERS & ELECTRONICS Feb 1983 (v.21#2) pg. 25

Interfacing with parallel and serial ports. An introduction to basic concepts involving the Centronix parallel and RS-232 serial data transmission.
COMPUTERS & ELECTRONICS Nov 1983 (v.21#11) pg. 74

A look at two types of interconnection signals used in computers: The RS-232 bipolar voltage signal and the 4ma/20ma current loop. Includes basic circuits for converting these signals to TTL and back again.
CQ. THE RADIO AMATEUR'S JOURNAL Oct 1979 (v.35#10) pg. 73

An explanation of the United States Electronics Industry Associates (EIA) RS-232 standard for data communications. Includes circuits for RS-232 -to- TTL converter and a breakout box. All twenty five pins of a typical DB-25 connector are discussed.
CQ. THE RADIO AMATEUR'S JOURNAL Jan 1985 (v.41#1) pg. 88
Correction CQ. THE RADIO AMATEUR'S JOURNAL Apr 1985 (v.41#4) pg. 116

Understanding the RS-232C communications standard.
CQ. THE RADIO AMATEUR'S JOURNAL Nov 1988 (v.44#11) pg. 32

Building flow-control mechanisms to pass ASCII files from one computer to another. Both RS-232C hardware and software wiring patterns are described.
CQ. THE RADIO AMATEUR'S JOURNAL Jan 1989 (v.45#1) pg. 98

A primer on digital signal interfaces (RS-232, RS-422, and RS-485).
CQ. THE RADIO AMATEUR'S JOURNAL Mar 1998 (v.54#3) pg. 46

Understanding digital modulation, the technique behind high speed data transfers, high-speed digital modems, and HDTV.
ELECTRONICS NOW Dec 1999 (v.70#12) pg. 38

How to link up your home to a computer center. The basics of terminals, teletypes, modems, signal transmission via telephone lines and costs involved.
ELEMENTARY ELECTRONICS Sep-Oct 1977 (v.17#5) pg. 41

Inexpensive teletype interface allows you to connect a RS232C I/O port to a 20 mA TTY. Estimated cost: $10. Limited to 110 baud.
ELEMENTARY ELECTRONICS Jan-Feb 1980 (v.20#1) pg. 35

An introduction to the RS-232 standard.
HANDS-ON ELECTRONICS Summer 1984 (v.2#1) pg. 36

Interfacing tips. Communicating with the outside world. A look at basic TTL-to-current and TTL-from-current interfaces and some specific applications.

Experiments in software. Serial to parallel conversion programs written for an Altair 8800 allows communication with a CRT with an RS 232C serial I/O via the 3P+S I/O board.

Error correcting codes, a software technique for detecting and correcting hardware errors that sometimes occur in data-transmission systems.

Error-correcting techniques for use in data transmission or interfacing.

Build a serial-to-parallel converter. Connect parallel devices to serial ports with this device. Will provide either TTL or RS-232 inputs/outputs. Est. cost: $35.

Circuit will convert parallel to serial (RS-232). Est. cost: $42.

Simple, low-cost circuit converts TTL-level signals to RS-232 and vice versa. Est. cost: $4.

Data communication error measurement. This 8080 machine-language program checks for errors in data-transmission systems.

All about ASCII. Get a fuller understanding of the ASCII character set and its use in data communications.

Build a "Quick Fox" terminal tester. Battery powered unit sends out a continuous stream of ASCII characters for testing a terminal or printer.
KILOBAUD MICROCOMPUTING #54 Jun 1981 (v.5#6) pg. 104

Special issue on communications and microcomputers including a review of available on-line data bases and information services.
KILOBAUD MICROCOMPUTING #58 Oct 1981 (v.5#10) pg. 42+

How data travels over telephone lines.
KILOBAUD MICROCOMPUTING #58 Oct 1981 (v.5#10) pg. 46

Communications program for a North Star Horizon computer. Use it to send and receive data and communicate with remote time-share systems or other microcomputers. Written in BASIC.
KILOBAUD MICROCOMPUTING Jan 1982 (v.6#1) pg. 118

List of active electronic message systems along with their location and telephone number.
MICROCOMPUTING Jul 1982 (v.6#7) pg. 20

Program to transmit TEXT files between an Apple III and an IBM PC over a 3-wire cable at 300 baud.
MICROCOMPUTING #83 Nov 1983 (v.7#11) pg. 32

Programs to "download" BASIC programs to a Commodore-64 machine via a hardwired RS-232 port.
MICROCOMPUTING #83 Nov 1983 (v.7#11) pg. 96

Build a serial-to-parallel interface using the RCA 1802 microprocessor.
MICROCOMPUTING #84 Dec 1983 (v.7#12) pg. 102

Hardware and software modifications needed to transfer files between a Texas Instrument 99/4A and an IBM PC computer.
MICROCOMPUTING #89 May 1984 (v.8#5) pg. 82

Free BASIC programs by radio. How you can capture computer programs that are broadcast internationally and in the U.S.
MODERN ELECTRONICS [2] Jun 1986 (v.3#6) pg. 36

A radio data link for Commodore 64. R-f link eliminates parallel cable between computer and peripheral, thus extending data transmission to as far as 1000 feet away.
MODERN ELECTRONICS [2] Aug 1986 (v.3#8) pg. 30

Motorola's MC14411 programmable bit rate generator IC is described.
MODERN ELECTRONICS [2] Feb 1988 (v.5#2) pg. 70

Wireless data link. This 300-baud accessory eliminates the need for long cable runs when connecting serial peripherals to a computer. Radio Shack's "Space Patrol" walkie-talkies are converted to transmit computer data on the 49-MHz citizens band.
MODERN ELECTRONICS [2] Sep 1988 (v.5#9) pg. 18

How computers detect and correct transmission errors.
POPULAR ELECTRONICS [1] Jun 1977 (v.11#6) pg. 70

Schematic for a circuit to interface an RS-232 data output port to a 20-mA current-loop printer.
POPULAR ELECTRONICS [1] Jun 1981 (v.19#6) pg. 82

Computer connection. A look at the most popular interfacing schemes. Looks at TTL, current-loop, RS-232, and Centronics parallel.
POPULAR ELECTRONICS [2] Aug 1990 (v.7#8) pg. 64

Answers to some of the most common questions about modems and computer communications.
POPULAR ELECTRONICS [2] Jan 1991 (v.8#1) pg. 64

The cheap-link file-transfer system. Using a direct port-to-port cable and inexpensive software to transfer files between two IBM compatible PCs.
POPULAR ELECTRONICS [2] Mar 1991 (v.8#3) pg. 70

All about parallel-port signals. What it transmits, receives, and how they are related.
POPULAR ELECTRONICS [2] Jan 1992 (v.9#1) pg. 38

Troubleshooting parallel connections. Information needed to interconnect parallel devices safely and properly, even without the manuals.
POPULAR ELECTRONICS [2] Feb 1992 (v.9#2) pg. 41

Programming parallel ports. Learn how to control and monitor the parallel port on your computer so you can interface it with your own computer projects.
POPULAR ELECTRONICS [2] Feb 1993 (v.10#2) pg. 47

Programming serial ports on your computer so you can build RS-232 based projects.
POPULAR ELECTRONICS [2] Aug 1993 (v.10#8) pg. 63

RS-232 and RS-485. An introduction to the terminology and applications of two mature serial interface standards.
POPULAR HOME AUTOMATION Jul 1998 (v.3#3) pg. 52

FireWire. An introduction to the IEEE 1394 serial interface standard.
POPULAR HOME AUTOMATION Sep 1998 (v.3#4) pg. 52

Digital data transmission. How a computer communicates with peripheral devices. A review of various transmission methods, transmission rates and interface schemes.
RADIO-ELECTRONICS May 1978 (v.49#5) pg. 44

Protocol converter. Allows RS-232 asynchronous terminals or CPU's which operate in X-on/X-off (also called DC1/DC3, Control-Q/Control-S) protocol to communicate with devices that use lead control for handshaking (RTS, CTS).
RADIO-ELECTRONICS Jul 1986 (v.57#7) pg. 11 (ComputerDigest)

All about microcomputer interfacing (connecting peripheral devices). Part 1. Serial vs. parallel. Parallel transmission. Transmission rates, baud rates, etc.
RADIO-ELECTRONICS Dec 1986 (v.57#12) pg. 9 (ComputerDigest)

DTMF (dual-tone multi-frequency) encoding and decoding. How to use "Touch-Tone" techniques to speed up signal transmission.
RADIO-ELECTRONICS Dec 1986 (v.57#12) pg. 65

All about microcomputer interfacing. Part 2. RS-232. Hints for debugging serial interfaces.
RADIO-ELECTRONICS Jan 1987 (v.58#1) pg. 13 (ComputerDigest)

Simple adaptor (interface) to exchange files between an Apple IIc and an IBM PC. Est. cost: $5.
RADIO-ELECTRONICS Mar 1988 (v.59#3) pg. 79

Understanding RS-232. RS-232-C pinouts identified. Includes an RS-232 driver circuit built around the MAX232 IC and requiring only a single +5-volt supply.
RADIO-ELECTRONICS Jun 1988 (v.59#6) pg. 65

The general purpose interface bus. Using the GPIB, IEEE 488 bus, or HP Interface Bus to exchange digital data and maintain control between instrumentation devices and computers. Part 1.
RADIO-ELECTRONICS Jul 1988 (v.59#7) pg. 57

The general purpose interface bus. Part 2.
RADIO-ELECTRONICS Aug 1988 (v.59#8) pg. 53

RS-232 monitor/control system. Hardware and software of an I/O control system that interfaces to your personal computer through an RS-232 port, is modular, and has full duplex operation for both input and output. Est. cost: $50.
RADIO-ELECTRONICS Aug 1988 (v.59#8) pg. 83, 68
Correction RADIO-ELECTRONICS Sep 1988 (v.59#9) pg. 16

New and improved RS-232 serial interface standard. A comparison between RS-232-C and EIA-232-D.
RADIO-ELECTRONICS Nov 1988 (v.59#11) pg. 87

The Exar XR-4151 chip converts an applied DC voltage to a pulse output that has a repetition frequency proportional to the DC voltage. Also convert square-wave or pulse input to DC. Use in A/D and D/A conversion and data transmission.
SCIENCE & ELECTRONICS [2] Mar-Apr 1981 (v.21#2) pg. 75