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The Index To How To Do It Information (HTDI Index) was created to aid public and college libraries in locating how-to articles in magazines to which they subscribe. Therefore, you must contact your local public library to see if they have the issue referred to by the index within their magazine collection or will secure a copy from another library. Also ask your librarian to provide you with the current address of the publisher of the magazine and check to see if the publisher can provide a copy of the article. In November 2012, the magazine collection accumulated by Norman Lathrop Enterprises and itemized in the UNION LIST was donated to the Akron-Summit County Public Library (60 S.High St., Akron OH 44326). For a fee, they may be willing to provide a copy of most articles cited in the HTDI Index. Contact them at 330-643-9075 or online at

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Access to the Web version of the Index To How To Do It Information (HTDI) is being made freely available to individuals and institutions subject to the understanding that the entire HTDI Index is a copyrighted work and all rights are reserved to Norman Lathrop Enterprises (2342 Star Dr., Wooster OH 44691). The contents of this database, in whole or in part, may not be offered for sale by anyone except Norman Lathrop Enterprises. Online users of the HTDI Index are subject to monitoring by NLE using statistical and analytical programs. Access to the online version of the HTDI Index is offered solely at the discretion of Norman Lathrop Enterprises and access is not guaranteed to continue.

The following two book formats of the Index To How To Do It Information are considered to be the only archival versions.
1963-1989 INDEX . This accumulation replaced 27 annual supplements and three accumulations covering the period 1963-1989. 8.5″x11″ paper-bound, two-volume set. Published 1993.
1990-1999 INDEX . This accumulation replaced six annual supplements (1990, 1994, 1995, 1996, 1997, 1998), completed indexing of three missing years (1991, 1992, 1993), and published the 1999 entries for the first time. 8.5″x11″ hardbound volume. Published 2002.


A short, programmable calculator program (HP-41C or HP-25) for checking the RIAA accuracy of your preamp.
AUDIO AMATEUR 1/1982 [Jan 1982] (v.13#1) pg. 30

Black Jack program for the Texas Instrument SR-52 programmable calculator.
BYTE Jun 1977 (v.2#6) pg. 150
Correction BYTE Sep 1977 (v.2#9) pg. 173

Texas Instrument SR-52 calculator game program "NIM" which allows up to nine rows of 1023 pawns each. Requires the PC-100 printer to keep track of results.
BYTE Jul 1977 (v.2#7) pg. 90
Correction BYTE Sep 1977 (v.2#9) pg. 172

How to write application programs for programmable desk top calculators, such as the Texas Instrument SR-52.
BYTE Oct 1977 (v.2#10) pg. 18

The HP-67 and HP-97 personal computers from Hewlett-Packard. Includes software for the Pinball Wizard game.
BYTE Jun 1978 (v.3#6) pg. 112
Correction BYTE Dec 1978 (v.3#12) pg. 163

Commander in Chief. A game for the TI-58 programmable calculator.
BYTE Dec 1978 (v.3#12) pg. 192
Correction BYTE Apr 1979 (v.4#4) pg. 201

Two game programs for the Texas Instrument model 58 or 59 programmable calculators. (1) ESP: Guess the number the calculator will generate. (2) Dice game.
BYTE Jan 1979 (v.4#1) pg. 170

Program for solving the Eight Queens puzzle on a TI SR-56 calculator.
BYTE Feb 1979 (v.4#2) pg. 146

RACE CAR game program written for the TI SR-52 programmable calculator.
BYTE Mar 1979 (v.4#3) pg. 26

MARSPORT. A three-dimensional celestial mechanics simulation for the HP-67 or HP-97 progammable calculator. Pilot a spaceship to a soft landing on Mars.
BYTE Apr 1979 (v.4#4) pg. 84
Correction BYTE Aug 1979 (v.4#8) pg. 194
Correction BYTE Oct 1979 (v.4#10) pg. 209

Program for a TI-59 programmable calculator to allow simulation or testing of combinational logic circuits.
BYTE Apr 1979 (v.4#4) pg. 172

A pattern recognition program written for the HP-25 programmable calculator. The calculator will detect the "pattern" of binary numbers being entered unless the operator enters truly random numbers.
BYTE Apr 1979 (v.4#4) pg. 236

DIGITS program written for the TI SR-52 programmable calculator. Object is to guess a number generated by the calculator in the fewest number of guesses possible.
BYTE May 1979 (v.4#5) pg. 182

TI-58 calculator program allows extended multiplication with anwers up to 90 digits long.
BYTE Nov 1979 (v.4#11) pg. 244

Calculator airborne navigation. Program for the HP-24 calculator finds ground speed and true heading.
BYTE Nov 1979 (v.4#11) pg. 245
Correction BYTE Dec 1980 (v.5#12) pg. 296

Numerical analysis of polynomial function with the TI-59 calculator. Part 1.
BYTE Dec 1979 (v.4#12) pg. 120

Analysis of polynomial function with the TI-59 calculator. Part 2.
BYTE Jan 1980 (v.5#1) pg. 130

TI-59 calculator program to store and retrieve data contained in the periodic chart, including atomic weight and calculated molecular weight.
BYTE Mar 1980 (v.5#3) pg. 208

Darth Vader's force battle program for the TI-59 calculator.
BYTE Oct 1980 (v.5#10) pg. 50

Program to calculate prime numbers to 10,000 using the square-root test limit. Written for the HP-19C calculator.
BYTE Oct 1980 (v.5#10) pg. 54

Product review of the HP-41C pocket calculator. Includes a benchmark program to calculate the present value of a bond with "periodic coupons" and a "Codebreaker" game program.
BYTE Dec 1980 (v.5#12) pg. 244

Self-modifying code for the Texas Instrument TI-58/59 programmable calculator.
BYTE Jan 1981 (v.6#1) pg. 142

Generating bar code in the Hewlett-Packard HP-41C format. Includes a BASIC program that converts an HP-41C program into a series of bar-code rows for printing on a high-quality printer with incremental spacing.
BYTE Jan 1981 (v.6#1) pg. 148

Program for coverting pitch to frequency is written in RPN (reverse Polish notation) for a Hewlett-Packard calculator.
BYTE Feb 1981 (v.6#2) pg. 92

Hunt the Wumpus game program for the HP-41C programmable calculator.
BYTE Mar 1981 (v.6#3) pg. 230

Benchmark program which uses the TI-59 calculator's parenthesis feature.
BYTE Apr 1981 (v.6#4) pg. 14

KTTOUR-59: a program for the Texas Instrument TI-59 that runs the Knight Tour game on an 8 by 8 board.
BYTE May 1981 (v.6#5) pg. 198

Kalman mileage predictor-monitor. An algorithm for the recursive optimal estimation of a car's mileage performance. Includes a program for the HP-67/97 calculator.
BYTE Jul 1981 (v.6#7) pg. 230

Draw poker program for the TI-59 programmable calculator.
BYTE Jul 1982 (v.7#7) pg. 434

Getting the most from your TI Programmer pocket calculator. Five algorithms for converting between hexadecimal and decimal numbers.
BYTE Sep 1982 (v.7#9) pg. 540

Calculating parallel resistance pairs. How to use a programmable calculator to find two resistance values to substitute for an unobtainable one.
COMPUTERS & ELECTRONICS Dec 1982 (v.20#12) pg. 92
Added Info COMPUTERS & ELECTRONICS Mar 1983 (v.21#3) pg. 7

Improved version of the SON OF SUBMARINE program which appeared in the November 1977 issue.

ARTILLERY PRACTICE game for the TI SR-56 calculator.

TIGER TROUBLE. Game where object is to avoid a man-eating tiger while on a safari.

CROSS-COUNTRY BALLOON TRIP game for a TI SR-52 calculator.

Programmable calculator program for number conversions from one base to another.

Calculator music. How to create music programs and "sound graphs" on a Hewlett-Packard HP-28S scientific calculator.
MODERN ELECTRONICS [2] Mar 1989 (v.6#3) pg. 24
Correction MODERN ELECTRONICS [2] May 1989 (v.6#5) pg. 83

Six programs written especially for the HP-25 programmable calculator. They are (1) Battle the dive bomber, (2) football, (3) blackjack, (4) space flight, (5) biorhythm forecast and (6) test your ESP.
POPULAR ELECTRONICS [1] Jun 1977 (v.11#6) pg. 39

How to program an HP-25 for use as a digital clock and timer.
POPULAR ELECTRONICS [1] Aug 1977 (v.12#2) pg. 57
Added Info POPULAR ELECTRONICS [1] Mar 1978 (v.13#3) pg. 10

Two-step timing program for the HP-25 calculator.
POPULAR ELECTRONICS [1] Feb 1978 (v.13#2) pg. 6

A review of programmable calculators that are available. Includes two programs for key- and card-programmables. (1) calculate surface area of Jupiters 12 moons and (2) calculate interest on money on deposit.
POPULAR SCIENCE Feb 1977 (v.210#2) pg. 64