Browse Prior Art Database

Handheld Calculators From HP and TI

IP.com Disclosure Number: IPCOM000129985D
Original Publication Date: 1997-Jan-01
Included in the Prior Art Database: 2005-Oct-07
Document File: 1 page(s) / 13K

Publishing Venue

Software Patent Institute

Related People

IEEE Computer Society: OWNER

Abstract

The excellent guide to HP handheld calculators) provides a wealth of information on the entire HP line. It contains a discussion of the history of each family, pictures of at-least one model from each family, estimated values, and variations that are of interest to collectors. The assessment of the current scarcity in Table 1 is based largely on the estimated values. There are several versions of the HP-35; the model listed in Table I is the most common version. The earlier models with a red flag in a hole next to the on-off switch, with bugs in the ROM etc., are much scarcer.

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THIS DOCUMENT IS AN APPROXIMATE REPRESENTATION OF THE ORIGINAL.

Copyright ©; 1997 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Used with permission.

Handheld Calculators From HP and TI

Hewlett Packard (HP) and Texas Instruments (TI) developed and produced many of the earliest and most popular handheld electronic calculators. Most of the early models used light-emitting diodes to display the results of the computations. This column is devoted to a listing of the LED pocket and small desk calculator models, the date of introduction, and a very subjective estimate of the current scarcity of the various models.1,2

Hewlett-Packard Calculators

The excellent guide to HP handheld calculators) provides a wealth of information on the entire HP line. It contains a discussion of the history of each family, pictures of at-least one model from each family, estimated values, and variations that are of interest to collectors. The assessment of the current scarcity in Table 1 is based largely on the estimated values.

There are several versions of the HP-35; the model listed in Table I is the most common version. The earlier models with a red flag in a hole next to the on-off switch, with bugs in the ROM etc., are much scarcer.

Texas Instruments Calculators

The article on TI handheld calculators2 contains a brief description of each model, the date of introduction, and the current scarcity (see Table 2).

There are two versions of the 2500 Dat...