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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.


How to interface a calculator hexadecimal keyboard to input data to a computer. Input to an 8008 microprocessor is featured.
BYTE Feb 1977 (v.2#2) pg. 104

A remote terminal transmitter and receiver allows a keyboard to be operated up to 200 feet away from the microprocessor. Transmission is via twisted pair cable for keyboard and coaxial cable for video monitor.
BYTE May 1977 (v.2#5) pg. 50

Using a keyboard ROM. An explanation of the logic theory and general description of a ROM encoder which easily converts unencoded or non-ASCII keyboards to ASCII.
BYTE May 1977 (v.2#5) pg. 76

Build a keyboard function decoder to turn your computer peripherals on and off from your keyboard.
BYTE Jul 1978 (v.3#7) pg. 98

Let your fingers do the talking. Part 1. Add a non-contact touch scanner to your video display. Simply touch the screen of your video display to enter information, using this circuit. It is simpler than a light pen.
BYTE Aug 1978 (v.3#8) pg. 156
Correction BYTE Oct 1978 (v.3#10) pg. 151

Let your fingers do the talking. Part 2. Applications of the scanner.
BYTE Sep 1978 (v.3#9) pg. 94

Level II BASIC program for TRS-80 system enables fast keyboard entry of hexadecimal code. Used in connection with the POKE function. Also includes a program to fill the screen of the TRS-80 with graphic characters.
BYTE Jun 1979 (v.4#6) pg. 212

Z80 assembler program accepts keyboard input and checks it to determine its validity (is it error free?). A table is checked to see if the input matches a valid command.
BYTE Nov 1979 (v.4#11) pg. 192

Product review of the Cherry Pro Keyboard.
BYTE Nov 1979 (v.4#11) pg. 232

Alpha lock for your ASCII keyboard. Simple circuit shifts only the 26 alphabetic characters when enabled by a switch.
BYTE Jan 1980 (v.5#1) pg. 156

Z80 code for uppercase to lowercase conversion in a keyboard-input subroutine.
BYTE May 1980 (v.5#5) pg. 152

Build a low-cost remote data-entry terminal using a standard twenty-key hexadecimal pad and the MM57499 serial keyboard-encoder circuit.
BYTE Sep 1980 (v.5#9) pg. 26

A lowercase to uppercase converter (hardware interface) requires a parallel interface between keyboard and computer.
BYTE Sep 1980 (v.5#9) pg. 326

Tip: Cover the Apple II "reset" key with a clear plastic cover to keep from hitting it accidentally.
BYTE Apr 1981 (v.6#4) pg. 18

Circuit for adding upper case/lower case shift to a DTL, RTL, or TTL keyboard.
BYTE May 1981 (v.6#5) pg. 390

Build a versatile keyboard interface for the S-100.
BYTE Oct 1981 (v.6#10) pg. 400

Accidental "reset" protection for the Apple II. Piggyback circuit board requires both CTRL and RESET to be pressed at the same time.
BYTE Jan 1982 (v.7#1) pg. 234

Add a full-sized keyboard to Sinclair's ZX-80 computer.
BYTE Mar 1982 (v.7#3) pg. 256

Serial circuit allows the keyboard for an IBM Personal Computer to be located 75 feet from the computer.
BYTE Feb 1983 (v.8#2) pg. 442

Using IBM's marvelous keyboard. How to change the IBM keyboard to the Dvorak layout or use the keyboard with other computers and software.
BYTE May 1983 (v.8#5) pg. 402

Add a high-quality keyboard to the Radio Shack Color Computer. Est. cost: $30.
BYTE Jul 1983 (v.8#7) pg. 266

Redefining the Apple keyboard. With minor software modifications, you can rearrange the Apple II keyboard into a Dvorak layout.
BYTE Jul 1983 (v.8#7) pg. 440

Foot control. Adding a foot-operated "control-character" key to your keyboard simplifies control sequences. Est. cost: $40.
BYTE Feb 1984 (v.9#2) pg. 346

A keyboard input routine for IBM PC BASIC accepts only the set of characters and number of characters defined by the programmer.
BYTE Apr 1984 (v.9#4) pg. 392

Keyboard and keystrokes. The electronic process of transferring a keystroke to a video screen. Part 1.
COMPUTERCRAFT May 1991 (v.1#2) pg. 35

Keyboard and keystrokes. Part 2.
COMPUTERCRAFT Jun 1991 (v.1#3) pg. 50

Add a keypad to your next project. What you should know to incorporate keypad-entry capability into computer and digital-electronic projects.
COMPUTERCRAFT Jul 1992 (v.2#7) pg. 38

Keypads made easy. A solder-and-scissors approach to making keypads for microcontrollers.
COMPUTERCRAFT Jul 1992 (v.2#7) pg. 44

Two accessories for the Sinclair/Timex computer. 1. Battery power to make the computer "portable" or as a back-up power supply. 2. Reset button.
COMPUTERS & ELECTRONICS Aug 1983 (v.21#8) pg. 22

Multiple-character generation from your keyboard. A low-cost addition that will let you automatically repeat a character by holding a key.
COMPUTERS & ELECTRONICS Oct 1983 (v.21#10) pg. 66
Correction COMPUTERS & ELECTRONICS Dec 1983 (v.21#12) pg. 5

Keyboard encoding schemes. A guide to computer keyboard operation and solving interface problems.
COMPUTERS & ELECTRONICS Oct 1983 (v.21#10) pg. 79
Correction COMPUTERS & ELECTRONICS Dec 1983 (v.21#12) pg. 5

Keyboards. A look at the inner workings of a keyboard.
COMPUTERS & ELECTRONICS Sep 1984 (v.22#9) pg. 61

How to build a home-brew ASCII keyboard controller. Part 1. How it works.
CQ. THE RADIO AMATEUR'S JOURNAL Dec 1981 (v.37#12) pg. 10

The new Windows 95 keyboards. An overview of what those three extra keys are used for.
ELECTRONICS NOW Aug 1996 (v.67#8) pg. 41

Circuit for interfacing two keyboards to one computer. However, neither keyboard will receive any signals back from the computer.
ELECTRONICS NOW Jun 1997 (v.68#6) pg. 68, 9

Tips on adapting a Wyse keyboard to replace an IBM keyboard.
ELECTRONICS NOW Jun 1998 (v.69#6) pg. 6

Tips on cleaning a computer keyboard.
FAMILY HANDYMAN #356 Mar 1995 (v.45#3) pg. 94

Converting a full-size TI99/4A keyboard (available from Radio Shack) for use with the Sinclair ZX-81 computer.
HANDS-ON ELECTRONICS Dec 1986 (v.3#7) pg. 63

Use that little old computer. How to hook up a remote keypad or switches to activate the primary keyboard of a Commodore VIC-20 computer. Use it for special applications (traffic survey, alarm system, etc.)
HANDS-ON ELECTRONICS Apr 1987 (v.4#4) pg. 39

Software keyboard interface. How to interface the bare keyboard from Datanetics Corp. to a Kim microcomputer with a minimum of hardware and a software routine of just 350 bytes. Est. cost for keyboard & interface: $22.

Build a touch-response display. Add a row of 8 push buttons (switches) along the bottom of your video monitor. Use a simple circuit and read routine to sample the switches and use the input data to call up programs, play video games, etc. Read routine is in 8080 assembly language.

CORRECTION to the article "Build your own ASCII keyboard" which appeared in the September 1977 issue of Kilobaud.

One keyboard produces both Hex and ASCII by using this simple converter.

Who needs a UART. Circuit for interfacing the parallel outputs from a keyboard to a serial input port. Uses only four standard chips, including the clock circuit.

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.

Modify your COSMAC Elf microcomputer to interface with a keyboard and allow you to jump to any location in memory. The circuit requires no programming and uses no memory space.

Routine to convert lower-case to upper-case when inputting data via a keyboard.

Circuit and PC pattern for an 8-bit hexidecimal keyboard. Uses the National Semiconductor 74C922 keyboard chip as the encoder. Est. cost: $35.

PET's keyboard grows up. Product review of Maxi Switch's full-size replacement keyboard for the PET computer.

Caps lock, not shift lock. Circuit shifts only the alphabetic characters to upper case, but leaves the numbers and special characters alone.

Lower-case for your Apple II. Part 1. Hardware modifications. Est. cost: $10.

Lower-case for your Apple II. Part 2. Software needed to complete the modification.

Converting Selectric keyboards from BCD to Correspondence code. Part 1. Mechanical aspects of conversion.

Hex and ASCII. Interface circuit capable of accepting ASCII input from inexpensive keyboards, converting certain codes into hexadecimal, reformating hex code to strobe out 2 characters in parallel, and provide keyboard control of a CPU.

Add a full-size detached keyboard to a PET computer. Estimated cost: $60. The old keyboard may still be used.

Audio feedback for computer keyboards. Silent computer keyboards can result in more errors than a keyboard which produces a specific sound each time a key is pressed. Two circuits shown.

Improving the OSI Challenger C2. Part 2. Video, cassette, and keyboard modifications.

Interface for attaching a TASA Model 55 touch-activated keyboard to a computer.
KILOBAUD MICROCOMPUTING #54 Jun 1981 (v.5#6) pg. 68

Circuit to eliminate accidental operation of the OSI C1 break key.
KILOBAUD MICROCOMPUTING #54 Jun 1981 (v.5#6) pg. 96

Apple II circuit modification prevents accidental resets. Est. cost: $10.
KILOBAUD MICROCOMPUTING #54 Jun 1981 (v.5#6) pg. 122

Student-proof your computer. How to add a special 7-key keyboard for use in a computer-aided instruction environment to eliminate the need for more sensitive and easily damaged keyboards.
KILOBAUD MICROCOMPUTING #56 Aug 1981 (v.5#8) pg. 151

Modification to TBUG converts the numeric keypad into a very handy hexpad to facilitate data entry.
KILOBAUD MICROCOMPUTING #60 Dec 1981 (v.5#12) pg. 212

Tip: Protect your keyboard from spilled liquids by placing into a clear plastic bag. You may use the keyboard without removing the bag.
KILOBAUD MICROCOMPUTING Jan 1982 (v.6#1) pg. 145

A relatively bounce-free switch responds directly to human touch and has no moving parts. Use in any situation where direct human input to a computer is desired without the need for a keyboard (music, handicapped, industrial control, etc.).
KILOBAUD MICROCOMPUTING Feb 1982 (v.6#2) pg. 100

Get some machine language programming practice by writing an uppercase-lowercase lock routine for your TRS-80 typewriter.
MICROCOMPUTING May 1982 (v.6#5) pg. 60

"Number pad" subroutine written in BASIC for the Apple II computer. Lets you use one hand to enter numerical data by redefining the meaning of various keys.
MICROCOMPUTING Sep 1982 (v.6#9) pg. 80

The intelligent toaster. Experiments in computer control. Design and construct your own video touch keypad.
MICROCOMPUTING #73 Jan 1983 (v.7#1) pg. 42

The intelligent toaster. Experiments in computer control. Continued discussion on designing and constructing touch circuits to input information.
MICROCOMPUTING #74 Feb 1983 (v.7#2) pg. 72

How to add a full-size keyboard to the Timex-Sinclair 1000 computer.
MICROCOMPUTING #76 Apr 1983 (v.7#4) pg. 54
Correction MICROCOMPUTING #78 Jun 1983 (v.7#6) pg. 28

How to program the Timex-Sinclair TS-1000 or ZX-81 computer in machine (hexadecimal) code. Includes instructions for adding a calculator keypad for input.
MICROCOMPUTING #82 Oct 1983 (v.7#10) pg. 38

Keyboard magic. Hexadecimal program for decoding the Commodore PET/CBM keyboard in order to expand the keyboard to include a reset button and a control key.
MICROCOMPUTING #82 Oct 1983 (v.7#10) pg. 86

How to program the fourteen keys of the Kaypro computer's numeric keyboard to act as dedicated function keys. A reconfigured keypad can make your computer easier to use, especially for word processing.
MICROCOMPUTING #88 Apr 1984 (v.8#4) pg. 56

A keyboard project that uses an EEPROM to store the key characters, making permanent changes simple. You can redefine keys to produce new keyboard layouts or assign multiple characters to a single key.
MICROCOMPUTING #89 May 1984 (v.8#5) pg. 102
Correction MICROCOMPUTING Sep 1984 (v.8#9) pg. 11

How keyboards communicate with computers.
MODERN ELECTRONICS [1] Jun 1978 (v.1#4) pg. 60

Building the Radio Shack ASCII keyboard. Some tips on construction, troubleshooting, and a correction to the manual.
MODERN ELECTRONICS [1] Sep 1978 (v.1#7) pg. 33

How to use EPROMs for non-memory applications. Creating complex digital logic circuits with EPROMs simplifies electronic designing. Circuits include (1) keyboard translator, (2) keyboard-controller and (3) stepper-motor controller.
MODERN ELECTRONICS [2] Jun 1987 (v.4#6) pg. 28

Electronic AB switch for PC keyboards. Electronically switches between two keyboards while keeping both keyboards powered at all times.
MODERN ELECTRONICS [2] Aug 1990 (v.7#8) pg. 46

ASCII keyboard and encoder uses two IC's. Output is directly compatible with TTL, DTL, RTL, CMOS and PMOS integrated circuits. Est. cost: $40.
POPULAR ELECTRONICS [1] Apr 1974 (v.5#4) pg. 27

Monitor program for the 8080 microprocessor so that programs can be entered from a keyboard.
POPULAR ELECTRONICS [1] Nov 1975 (v.8#5) pg. 102

How to fully debounce low-cost keyboards. Inexpensive approach to properly interfacing calculator keyboards to microcomputers.
POPULAR ELECTRONICS [1] Jan 1977 (v.11#1) pg. 51

Six CMOS digital integrated circuits include (1) automatic keyboard repeat and (2) contact debouncer.
POPULAR ELECTRONICS [1] Apr 1977 (v.11#4) pg. 46

The versatile keypad. How to interface decimal and hexadecimal keypads to digital circuits. How to debounce the mechanical switch (key). Typical uses include computer data entry, electronic combination locks and a controlled pulse generator.
POPULAR ELECTRONICS [1] Aug 1978 (v.14#2) pg. 58

Build a keyboard conversion circuit. Three ICs convert spst keyboard output into the column-row format used by decoder chips.
POPULAR ELECTRONICS [1] Oct 1978 (v.14#4) pg. 74

A hexadecimal keyboard encoder. Part 1. Built on a perforated board, this unit uses 16 normally open pushbutton switches as the keypad.
POPULAR ELECTRONICS [1] Nov 1978 (v.14#5) pg. 113

A hexadecimal keypad encoder. Part 2. Adding RAM to the encoder.
POPULAR ELECTRONICS [1] Dec 1978 (v.14#6) pg. 86
Correction POPULAR ELECTRONICS [1] Mar 1979 (v.15#3) pg. 6

How to add extra keyboards in tandem to an existing keyboard.
POPULAR ELECTRONICS [1] Apr 1980 (v.17#4) pg. 56

Add a "key-down" audible signal to your computer keyboard. Simple circuit provides audible confirmation that a key has been struck properly.
POPULAR ELECTRONICS [1] Oct 1980 (v.18#4) pg. 74

Simple BCD keyboard encoder circuit uses CMOS chips for low power consumption.
POPULAR ELECTRONICS [1] Aug 1981 (v.19#8) pg. 90

Add doubles to your computer. Build this battery-powered unit which allows two simple key closures (switches) to input signals to a computer. Useful when two players must respond to a computer game.
POPULAR ELECTRONICS [1] Mar 1982 (v.20#3) pg. 70

Circuit to hold and display (on LEDs) the ASCII code being generated by a particular key on a keyboard.
POPULAR ELECTRONICS [1] Sep 1982 (v.20#9) pg. 102

Keyboard clean-up. How to disassemble and thoroughly clean a computer keyboard.
POPULAR ELECTRONICS [2] Feb 1993 (v.10#2) pg. 65

Alarm projects and keypad interfaces. (1) Warning system isolated from main power source. (2) System-tripped indicator. (3) Time-keeping circuit to remind someone to take a medication. (4) Interface for low-cost telephone-like keypad produces a logic output that identifies the key that has been pressed. (5) Standard telephone-type keypad will operate a relay if the correct four-digit code is entered.
POPULAR ELECTRONICS [2] Feb 1998 (v.15#2) pg. 64
Correction POPULAR ELECTRONICS [2] Apr 1998 (v.15#4) pg. 56

Designing a keyboard encoder. Part 1.
RADIO-ELECTRONICS Feb 1983 (v.54#2) pg. 82

Designing a keyboard encoder. Part 2. Adding a digit select to a BCD encoder.
RADIO-ELECTRONICS Mar 1983 (v.54#3) pg. 82

Designing a keyboard encoder. Part 3. Audio feedback, a data bus, and a "clear" function.
RADIO-ELECTRONICS Apr 1983 (v.54#4) pg. 142

Tips on using the "Kaltek" SL-6 module to make a touch-sensitive switch that holds "on" for a predetermined amount of time. Has applications for computer keyboards.
RADIO-ELECTRONICS Jan 1985 (v.56#1) pg. 79

Using a TI-99 keyboard on a Sinclair ZX-81.
RADIO-ELECTRONICS May 1986 (v.57#5) pg. 7 (ComputerDigest)

From keypress to scan code. How IBM keyboards work and how they differ from one another. Includes a BASIC program to demonstrate the state of all shift keys, BIOS-level scan codes, and the high-level interpretation of those codes.
RADIO-ELECTRONICS Jul 1987 (v.58#7) pg. 70

Working with surplus keyboards. How they work and how to use them.
RADIO-ELECTRONICS Jul 1987 (v.58#7) pg. 74

Keyboard to microprocessor interfacing make easy.
SCIENCE & ELECTRONICS [2] May-Jun 1981 (v.21#3) pg. 35