Texas Instruments LP3000 / Deskmath

Date of introduction:  June 1972 Display technology:  Panaplex II
New price:   Display size:  8
Size:  8.4" x 6.2" x 2.5"    
Weight:  1 pound 14 ounces Serial No:  3000-00632
Batteries:   Date of manufacture:  mth 08 year 1972
AC-Adapter:  120 V Origin of manufacture:  USA
Precision:  8 Integrated circuits:  TMS0109
Program steps:   Courtesy of:  Joerg Woerner
    Download manual: (US: 2.4 MBytes)

The famous TI-2500 Datamath calculator was first announced in April 1972 together with the Deskmath LP3500 desktop model. Find a reprint of the Press Release about the introduction here. Beginning June 1972 first customers got in the Neiman-Marcus and Sanger-Harris department stores in Dallas, TX both the TI-2500 and this rare Deskmath LP3000 before the formally introduction on September 21, 1972. 

LP-3000_Logo.jpg (10114 Byte)In September 1972 the nameplates of the desktop models changed to the more common TI-3000 and TI-3500 designations. Unfortunately the "Deskmath" nickname disappeared.

LP-3000_Label.jpg (29420 Byte)To our current knowledge only few (about 1000) Deskmath calculators were produced between May 1972 and August 1972 in a beige housing. For the later production a slightly darker color was chosen. Don't miss the transitional TI-3000 Deskmath manufactured in September 1972.

Dismantling the early Deskmath LP3000 and comparing it with the later TI-3000 reveals a lot of differences:

The housing of the Deskmath LP3000 is fixed with only 3 screws instead the 5 screws found on the later TI-3000. 

LP-3000_Back.jpg (38265 Byte)

The top part of the housing makes use of expensive metal inserts for the screws but lacks the rounded cut outs for the keys.

LP-3000_Top.jpg (38390 Byte)

The Deskmath LP3000 sports an early Panaplex II display with only 8 digits for the numbers and 3 additional signs for negative numbers, entry- and calculation-overflow. LP-3000_PCB.jpg (148289 Byte)


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Joerg Woerner, October 13, 2004. No reprints without written permission.