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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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CARTRIDGE TAPE DRIVE (COMPUTER) x DIGITAL CASSETTE DRIVE xx CASSETTE TAPE RECORDER xx COMPUTER INPUT & OUTPUT xx TAPE DRIVE (COMPUTER) Saturation recording's not all that hard. A simple tape driver circuit, input signal processor and the design of software for direct digital recording with audio tape heads on cassette recorders. The digital cassette subsystem. Part 1. Digital recording background and head interface electronics. Serial storage media. An introduction and glossary on the use of a cassette tape recorder for mass storage. The impossible dream cassette interface. Circuit and software for an audio cassette I/O port with only a single line in each direction. Cassette transports for the hobbyist who prefers to design and build his own cassette system. Reviews the Amilon transports, the Phi-Deck transports, and the Wollensak transports. The digital cassette subsystem. Part 2. Digital data formats and system considerations. A software controlled 1200 bps audio tape interface. How to run the Southwest Technical Products AC-30 audio tape cassette interface considerably faster than the 300 bps rate of the BYTE or KANSAS CITY standard. Fundamentals of sequential file processing. Use of two cassette tape recorders to maintain and update sequential files is discussed. How to get your Tarbell going. How the Tarbell cassette interface works and tips on improving its performance. A simpler digital cassette tape interface. Circuitry to modify a standard cassette recorder for direct digital recording. A cassette interface switching box for the Radio Shack TRS-80. Allows user to (1) manually control the cassette recorder without having to unplug the recorder's remote jack and (2) allow audio monitoring of the tape while it is being loaded. Audio meter for the TRS-80 cassette recorder displays the recording and playback audio levels. The cassette lives on. An alternative to floppy disk mass storage. Includes a schematic for a peak-signal strength meter and tips on tape and adjustments to improve recorder performance. 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). A circuit for driving record heads with current rather than voltage. Enables data transfer rates of up to 2400 bits per second on a standard cassette tape recorder. Digital minicassette controller. How to use the Intel 8741A Universal Peripheral Interface to control a Braemar CM-600 Mini-Dek transport. How to build an inexpensive cassette level indicator. Add a cassette interface to your Commodore VIC-20 computer. PC tape backup systems. Tips on selecting one for your needs and how to install both internal and external units. Circuit for attaching a cassette recorder to a VIC-20 computer. Improving Timex/Sinclair tape loading. This circuit will reduce troublesome dropouts and noise problems. Est. cost: $23. A VIC-20 cassette adapter allows any commonplace audio cassette recorder to be used. Est. cost: $7. Cassette controller for TRS-80 computers. Build an Atari tape interface. A simple FSK interface permits loading and storing programs on a conventional cassette recorder. Est. cost: $30. Cassette file directory program for the TRS-80 Level I microcomputer. The first file on the tape is a directory of programs on that tape. Tips on storing magnetic tape and diskettes for computers. All about removable media drives (flexible, hard drive, tape, and optical disk) for computer data backup or exchange. Tape controller fits between the computer interface and the cassette recorder. It monitors both record and playback signals without pulling the remote control patch cord. Est. cost: $10. Tips on buying and storing cassette tapes for hobby computer use. Read and write character routines used with the Morrow Cassette Interface and reproduced and described. Programs for the Mits 88-ACR cassette interface board which allows it to operate at 1200 baud instead of 300 baud. Includes a modified bootstrap and a dumper loader block. The Data Duffer. Make operation of a audio cassette recorder to store and load data to a computer almost foolproof. You leave all cables permanently plugged in and use a switch to control input or output. A meter on the front of the Data Duffer plus a small speaker wired across the output jack line let you hear and see that data is being recorded on tape. How to correct two problems with using audio cassette recorders on computers. (1) Overcoming low-level ground loops which can degrade the systems reliability and (2) Overriding the computer's control of the recorder drive motor. Kansas City standard at 1200 baud. A review of Percom's I/O cassette board (# CI-812). Includes programs for memory-to-cassette and cassette-to-memory loading routines. Copying computer cassettes. This controller is connected between the output of one cassette recorder and the input of the second cassette recorder. Powered by a 9-volt battery, the controller maintains proper volume level and also regenerates the signal to remove noise. How to expand your KIM-1 system economically. How to interface the KIM to a video monitor and an ASCII keyboard, add more memory, add a cassette tape recorder, and add a power supply. Both hardware and software are described. Short software routine allows tape duplicating without removing or inserting any patchcords. The program permits SWTBUG or MIKBUG (6800 based systems) to provide an echo for tape duplicating. Machine-language programs for the Radio Shack TRS-80 computer, plus an explanation of how the TRS-80 performs some of its internal software functions. Programs include one which allows the TRS-80 Level I to produce and read cassette tapes at 1000 baud. TRS-80 tape controller contains switches to change from READ to WRITE, and to change from COMPUTER to MANUAL control. No need to connect and disconnect recorder plugs. Cassette interfacing: A multilingual approach. A look at the variety of "languages" used to communicate between a CPU and a cassette deck. A combination hardware/software solution to the problem is described. Basic hardware and software techniques used to store and retrieve cassette data with the Commodore PET computer. Tip: Storing data cassette tapes in a plastic bag in the refrigerator may overcome some loading problems and allow you to copy the tape onto a new one. How to record a vocal response on a tape recorder connected to a computer, and then play back the voice under program control at appropriate places in the program to give the illusion that the computer is talking. Application to a TRS-80 is described. Interface allows two cassette recorders to be attached to a TRS-80 system. One recorder is used to read tape and the other to write tape, or both may be used to write tape. Est. cost: $35. Tip: How to align the tape reading head on a PET computer. Super standard, high-speed cassette interface. Circuit for a design which incorporates two baud rates, 300 and 1200. Uses the Kansas City standard for low speed. Est. cost: $10. Product review of the George Morrow (Thinker Toys) cassette and general-purpose I/O interface called the "Speakeasy". Monitor program for a Heath H8-video terminal & cassette I/O system. Enables hexadecimal communication and allows 8080 assembly-language programs to be run. Makes maximum use of the ROM panel monitor and cassette program. No hardware modification required. Complete program listing included. Thoughts on the SWTP computer system. Part 4. Four cassette interfaces for the 6800 are reviewed. Eyes for the AC-30. Simple modification lets you add video monitoring to the AC-30 cassette interface from SWTP. The Exatron stringy floppy. A product review. Load programs the SIMPL way. An 8080 assembly language program is used to load all of the programs that follow it on the IPL (initial program load) tape until it finds a program named END. It will then link BASIC, assembler, and the utility program to the system monitor. Written for the SOL-20 SOLOS monitor. Stringy floppy encore. Product review of the TRS-80 version of the Exatron Stringy Floppy. Elfin echoes. Add an audio output to your ELF II cassette tape interface. Use it to monitor program loads and saves. 6800 tape system. A high-speed tape system for the SWTP 6800 computer. Loads 8K BASIC in 1 minute. Uses a simple circuit costing only $5. Load your SWTP from a cassette recorder at 4800 or 9600 baud using the JPC Products Co. tape interface. Tips from one user. Estimated cost: $50 + cassette recorder. Improve your SWTP AC-30 cassette interface with the addition of this extra audio stage (preamplifier). How to add a digital tape-index counter to the built-in cassette recorder of a PET computer. CONOPS. Part 4. Cassette-quality test program fills a tape with alternating 0's and 1's. The tape is then read back and any error causes an alarm to sound. Program eliminates the need for a mechanical index counter on the PET tape recorder. The program speeds up the locating of any program on the tape. Use an MEK6800-D2 computer kit, with a Kansas City Standard cassette interface, to create MIKBUG-format tapes for loading into a 6800-based computer (such as the SWTP 6800). Build this cassette interface which uses the Tarbell biphase recording method. Transmits at 200 bytes per second. Estimated cost: $2. Simplified Kansas City Standard (KCS) tape interface, the BG-KCS, interfaces to a Motorola MEX6800-D2 two-board computer. Evolution of a cassette-based SWTP 6800. Interfacing a high-quality cassette player and a high-speed (4800 baud) cassette interface to an SWTP computer. TRS-80 Level II BASIC program will allow you to save any machine-language program on tape so that it may be reloaded using the Level II SYSTEM command. Living with cassettes. Tips on maintaining your cassette storage in peak operating condition. Modify the Heath H8 cassette interface to operate at twice the speed (2400 baud). Phantom tape drive for a PET computer. Add a second cassette drive to a PET. Both drives are attached to cassette port #1. Use a switch to determine which cassette is to be accessed. Estimated cost: $2 + cassette player. Improving the OSI Challenger C2. Part 2. Video, cassette, and keyboard modifications. Low overhead cassette format for 6800 system increases the speed of the Kansas City Standard. The TC-8 cassette interface system for the TRS-80 computer. Profile of a JPC Products Company (Albuquerque NM) kit that will load cassette files up to five times faster. Estimated cost: $90. Second cassette interface for the PET computer requires a minimum of parts. Cassette-to-disk program written in BASIC for PET computer. Copies any tape data file to disk. Faster baud rate for the OSI Superboard II cassette. A simple hardware modification lets you save and load at 600 baud. Save it with CASSY. Machine-language program for the C1P saves any area of memory to the cassette recorder. Information about using the Atari 410 Program Recorder for data table storage is more clearly explained than in the users manual. OSI baud modification. Double and quadruple your cassette storage speed with this circuit for the OSI Superboard and C1P computer. Dump program for the OSI Superboard or Challenger C1P will save machine language programs on tape. Simple cassette modification lets you "hear" the programs as you load tape. Est. cost: 10 cents. Tape copy and compare program written in 6800 assembly language. Makes backup copies of machine-language, BASIC or assembler source tapes. How to use the powerful I/O features of an Atari computer equipped with a cassette recorder. Tape data file hex dump utility for the VIC computer. Trouble-free cassette use on the Atari. Learn how to use Atari cassette files. A file manager program for the ZX-81 and TX-1000 computer equipped with cassette tape. Machine-language programs give your ZX-81 (Timex-Sinclair 1000) the ability to read and write data tapes. Build this simple cassette interface circuit that lets you use an ordinary recorder with the VIC-20 computer. A cassette-to-RS232 adapter for Radio Shack Color Computers. Connects a printer to the cassette port of CoCo computers and doubles the number of available serial ports. Build a portable analog or digital memory translator. This device permits storing both analog signals (between dc and about 250 Hz) and digital data (up to 500 bits per second) on a low-cost cassette. The data can be played back later and the translator will convert them back to their original signal. Est. cost: $70. Hobbyist interchange tape system. Circuitry and logic necessary to use inexpensive cassette tape recorders to exchange programs among amateur computers. A look at the various amateur computer cassette tape systems being proposed. A cassette control system for computers. The "Aux Box" cassette deck controller interfaces between Radio Shack's TRS-80 computer and a cassette recorder. This device allows forward and backward motion of the tape at three speeds, audio recording by flipping a switch, relay protection, and easy switching from manual to computer control of the cassette. Can be adapted to other computer systems. Peak-reading meter eliminates azimuth and level problems in transferring computer digital information when using inexpensive cassette recorders. Estimated cost: $26. Use meter and cassette to adjust your cassette recorder. Tape regenerator project for TRS-80 computer. A hardware-software system for reproducing properly timed backup cassettes on a second recorder. This will result in better tapes by reshaping and retiming the pulses. Commodore cassette interface lets you connect almost any audio cassette recorder to your Commodore 64 or VIC-20. ATARI game recorder. Part 1. Build this interface to make copies of your ATARI 2600 game cartridges on cassette tapes. Tape streamer for your computer. Transfer files from one computer to another using this "universal" cassette interface. Operates at 4800 baud. Attaches to any computer with an RS-232 port. Part 1. The circuit. Tape streamer for your computer. Part 2. Data encoding scheme and construction details. Cassette-to-cassette interface. How to make bulk copies of computer programs by directly connecting two Commodore cassette tape recorders and bypassing the computer completely. Cassette interface circuit allows almost any cassette recorder to be used with the Commodore-64 or VIC-20 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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