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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
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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.


An answer/originate modem is constructed from precalibrated modules to simplify construction. Includes CP/M compatable software.
BYTE Jun 1980 (v.5#6) pg. 24

A build-it-yourself modem for under $50. Originate-only unit will work from 0 to 300 baud. Uses acoustic coupling to telephone handset.
BYTE Aug 1980 (v.5#8) pg. 22
Correction BYTE Oct 1980 (v.5#10) pg. 332
Correction BYTE Nov 1980 (v.5#11) pg. 112
Added Info BYTE Aug 1983 (v.8#8) pg. 484

A Pascal library unit for the Micromodem II. Pascal routines allow the Apple computer to perform mass-transfer and processing of files via the Micromodem II.
BYTE Feb 1981 (v.6#2) pg. 106

Build a null modem.
BYTE Feb 1981 (v.6#2) pg. 198

Apple Pascal support unit (subroutine) for the Hayes Microcomputer Products Micromodem II.
BYTE Jul 1981 (v.6#7) pg. 308

An Apple talks with the deaf. How to interface a 60-milliampere acoustic coupler to an Apple computer. This will allow communication between the Apple and a TTY (teletypewriter) used by a deaf person.
BYTE Jan 1982 (v.7#1) pg. 366

Build the ECM-103, an originate/answer modem. Texas Instruments TMS99532 chip forms the heart of a Bell-103-compatable modem. Construction of an acoustic coupler also shown. Est. cost: $105.
BYTE Mar 1983 (v.8#3) pg. 26
Added Info BYTE May 1984 (v.9#5) pg. 497

Build a power-line carrier-current modem that allows you to communicate over AC house wiring at 1200 bits per second.
BYTE Aug 1983 (v.8#8) pg. 36

Telephone ring-detection circuit is useful for detection of high-voltage signals and conversion to common logic levels.
BYTE Dec 1983 (v.8#12) pg. 558

Modems and protocols. What you need to know about the standards and the language of modems.
COMPUTERCRAFT Oct 1993 (v.3#10) pg. 58

Tips on protecting your computer modem from electrical spikes on the telephone line.
CQ. THE RADIO AMATEUR'S JOURNAL Dec 1987 (v.43#12) pg. 102

Build a pair of line-carrier modems that communicate over AC powerlines. Operates at any baud rate up to 9600. Uses existing communications software to send and receive. Est. cost: $129/pair (kit).

Latest modem communications standards explained.
ELECTRONICS NOW Sep 1994 (v.65#9) pg. 35

ModCom. Build the Modem Commander, a device to turn a remote computer on (via telephone) when you need access, and automatically shut it off when you're through. Uses a 4-digit code for security. Est. cost: $85 (kit).
ELECTRONICS NOW Jan 1997 (v.68#1) pg. 47

How to install a modem card in a personal computer.
FAMILY HANDYMAN #339 Jun 1993 (v.43#6) pg. 84

Modem questions and answers.
HANDS-ON ELECTRONICS Sep 1987 (v.4#9) pg. 75

Mickey Modem. Use this "modem-like" device to send cassette interface audio signals directly over phone lines, instead of having to physically sending a cassette. Can be used for most local phone calls. The hardware consists of 2 IC amplifiers wired to a hybrid network connected to the phone line. Allows two computers to be connected via phone line and one of them functions as a stand-alone terminal.
Added Info KILOBAUD MICROCOMPUTING #41 May 1980 pg. 64

Keeping Ma Bell happy. Tips on constructing an S-100 bus compatible modem board and correctly connecting it to the telephone lines. Features the 88-modem from International Data Systems.

How to convert the Realistic telephone amplifier to serve as an acoustical coupler (modem) for sending computer data over local phone lines. Does not require a direct connection to phone lines because it uses the regular handset. Est. cost: $20.

Route 66 modem. Constructing an originate-only modem kit supplied by Electronic Systems (San Jose CA). Operates at 110 and 300 baud. Estimated cost: $66.

Tips on building and troubleshooting an inexpensive modem kit ($28) from Electronic Systems (San Jose CA). Operates at 300 baud or less. May be converted from originate mode to answer mode.

How to interface an auto-answer modem to a Vector MZ computer and communicate with it via a Texas Instrument portable data terminal.

Kilobaud Klassroom #24. Connecting to the outside world. Programming the PIA, Motorola's parallel interface adapter IC designed to work with 6800 microprocessors. Listing for an acoustic coupler test program included.
KILOBAUD MICROCOMPUTING #49 Jan 1981 (v.5#1) pg. 168

Modem control. BASIC control program for the Hayes' Micromodem 100 or 80-103A.
KILOBAUD MICROCOMPUTING #49 Jan 1981 (v.5#1) pg. 192

The modem eliminator. How to connect two computers directly by using this null modem. Both full-duplex and half-duplex circuits are described.
KILOBAUD MICROCOMPUTING #50 Feb 1981 (v.5#2) pg. 112

Economical data communications for an Apple computer. Hardware and software allows an inexpensive modem to be interfaced to the game-paddle connector.
KILOBAUD MICROCOMPUTING #51 Mar 1981 (v.5#3) pg. 65

Examination of the Bizcomp Intelligent Modem includes a Pascal program to repeatedly dial a phone number.
MICROCOMPUTING Nov 1982 (v.6#11) pg. 116

8080 assembly language program for using a modem with your Heath H8 computer.
MICROCOMPUTING #83 Nov 1983 (v.7#11) pg. 54

Single-chip modem designed for use in portable systems. It is based on CMOS technology, runs at 300 BPS and requires only a +5 volt supply.
MICROCOMPUTING #87 Mar 1984 (v.8#3) pg. 26

Transfering BASIC programs from one computer to another. How to fabricate cables and use modems (or null modems) to transfer ASCII files between computers.
MODERN ELECTRONICS [2] Apr 1985 (v.1#7) pg. 38

Simple circuit interfaces a 300 baud Commodore VicModem to any RS-232 port.
MODERN ELECTRONICS [2] Jul 1990 (v.7#7) pg. 36

Phone-line privacy module. A specialized two-lead semiconductor (added in series with each phone that might interfere with modem operation) will protect your modem communications from accidental interruptions.

Build the Pennywhistle, a 300 baud modem for digital data transmission and receiving over telephone lines. Est. cost: $100.
POPULAR ELECTRONICS [1] Mar 1976 (v.9#3) pg. 43
Correction POPULAR ELECTRONICS [1] May 1976 (v.9#5) pg. 6

BBS protector circuit disconnects a user from a bulletin-board computer service whenever an inactive modem line is detected. This prevents an inactive user's terminal from tying up a communication line.
POPULAR ELECTRONICS [2] Apr 1990 (v.7#4) pg. 27

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

Modem protector circuit completely disconnects all phones on a line when you are using a modem.
POPULAR ELECTRONICS [2] May 1997 (v.14#5) pg. 69

Modem. Part 1. Build this crystal controlled Bell 103-type, acoustically-coupled modem which operates at 300 baud. Has switch selectable answer and originate modes. Est. cost: $60.
RADIO-ELECTRONICS Jun 1981 (v.52#6) pg. 39
Correction RADIO-ELECTRONICS Sep 1981 (v.52#9) pg. 16

Modem. Part 2.
RADIO-ELECTRONICS Jul 1981 (v.52#7) pg. 45

Modem. Part 3. Software package for serial communication. Written in assembly language for an 8080 or Z80 microcomputer.
RADIO-ELECTRONICS Aug 1981 (v.52#8) pg. 57

An explanaton of full-duplex and half-duplex computer communication via modems.
RADIO-ELECTRONICS Mar 1985 (v.56#3) pg. 82

The new high-speed modems. How they evolved, how they work, and their applications.
RADIO-ELECTRONICS Apr 1985 (v.56#4) pg. 7 (ComputerDigest)

Modem minder. A buzzer will sound when your auto-dialing program makes contact with another computer.
RADIO-ELECTRONICS May 1985 (v.56#5) pg. 11 (ComputerDigest)

You can build this modem for your Commodore 64. Originate-only 300 baud modem features homemade acoustic coupler. Part 1.
RADIO-ELECTRONICS Nov 1985 (v.56#11) pg. 9 (ComputerDigest)

You can build this modem for your Commodore 64. Part 2.
RADIO-ELECTRONICS Dec 1985 (v.56#12) pg. 11 (ComputerDigest)

Protecting your computer modems from lightning strikes.
RADIO-ELECTRONICS Jun 1986 (v.57#6) pg. 10 (ComputerDigest)

More on modems. Tips on interfacing a modem to your personal computer.
RADIO-ELECTRONICS Jul 1986 (v.57#7) pg. 7 (ComputerDigest)

No-frills modem. Build a Bell 103 compatible modem with only one or two chips.
RADIO-ELECTRONICS Nov 1986 (v.57#11) pg. 9 (ComputerDigest)

Typical data-access arrangement circuits to get modem tones or other audio or control signals onto or off of the telephone lines.
RADIO-ELECTRONICS Jul 1988 (v.59#7) pg. 71

Build a pair of line-carrier modems that communicate over AC power lines. Operates up to 9600 baud. Est. cost: $100. Part 1.
RADIO-ELECTRONICS Jul 1988 (v.59#7) pg. 87

Build a pair of line-carrier modems that communicate over AC power lines. Part 2.
RADIO-ELECTRONICS Aug 1988 (v.59#8) pg. 88, 66, 67

Thoroughly modern modems. How to pick the right modem for your application.
RADIO-ELECTRONICS Nov 1989 (v.60#11) pg. 83

Making the telephone connection. Basic information on connecting a modem to your computer.
SCIENCE & ELECTRONICS [2] May-Jun 1981 (v.21#3) pg. 45