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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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MODEM xx COMPUTER INPUT & OUTPUT xx DATA COMMUNICATION An answer/originate modem is constructed from precalibrated modules to simplify construction. Includes CP/M compatable software. A build-it-yourself modem for under $50. Originate-only unit will work from 0 to 300 baud. Uses acoustic coupling to telephone handset. 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. Build a null modem. Apple Pascal support unit (subroutine) for the Hayes Microcomputer Products Micromodem II. 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. 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. Build a power-line carrier-current modem that allows you to communicate over AC house wiring at 1200 bits per second. Telephone ring-detection circuit is useful for detection of high-voltage signals and conversion to common logic levels. Modems and protocols. What you need to know about the standards and the language of modems. Tips on protecting your computer modem from electrical spikes on the telephone line. 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. 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). How to install a modem card in a personal computer. Modem questions and answers. 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. 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. Modem control. BASIC control program for the Hayes' Micromodem 100 or 80-103A. The modem eliminator. How to connect two computers directly by using this null modem. Both full-duplex and half-duplex circuits are described. Economical data communications for an Apple computer. Hardware and software allows an inexpensive modem to be interfaced to the game-paddle connector. Examination of the Bizcomp Intelligent Modem includes a Pascal program to repeatedly dial a phone number. 8080 assembly language program for using a modem with your Heath H8 computer. 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. Transfering BASIC programs from one computer to another. How to fabricate cables and use modems (or null modems) to transfer ASCII files between computers. Simple circuit interfaces a 300 baud Commodore VicModem to any RS-232 port. 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. 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. Answers to some of the most common questions about modems and computer communications. Modem protector circuit completely disconnects all phones on a line when you are using a modem. 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. Modem. Part 2. Modem. Part 3. Software package for serial communication. Written in assembly language for an 8080 or Z80 microcomputer. An explanaton of full-duplex and half-duplex computer communication via modems. The new high-speed modems. How they evolved, how they work, and their applications. Modem minder. A buzzer will sound when your auto-dialing program makes contact with another computer. You can build this modem for your Commodore 64. Originate-only 300 baud modem features homemade acoustic coupler. Part 1. You can build this modem for your Commodore 64. Part 2. Protecting your computer modems from lightning strikes. More on modems. Tips on interfacing a modem to your personal computer. No-frills modem. Build a Bell 103 compatible modem with only one or two chips. Typical data-access arrangement circuits to get modem tones or other audio or control signals onto or off of the telephone lines. Build a pair of line-carrier modems that communicate over AC power lines. Operates up to 9600 baud. Est. cost: $100. Part 1. Build a pair of line-carrier modems that communicate over AC power lines. Part 2. Thoroughly modern modems. How to pick the right modem for your application. Making the telephone connection. Basic information on connecting a modem to your computer. | |||||||||
Copyright © by Norman Lathrop Enterprises. All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means (electronic, mechanical, print photocopying, recording or otherwise) without the prior expressed permission of Norman Lathrop Enterprises, except as permitted by law. |
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