DATAMATH CALCULATOR MUSEUM
|Date of introduction:||September 1971||Display technology:||LED-stick|
|New price:||$240||Display size:||8|
|Size:|| 5.2" x 3.1" x
133 x 78 x 37 mm3
|Weight:||10.9 ounces, 310 grams||Serial No:||28445|
|Batteries:||6*AA NiCd||Date of manufacture:||mth 02 year 1972|
|AC-Adapter:||Origin of manufacture:||USA|
|Program steps:||Courtesy of:||Joerg Woerner|
|Download manual:||(US: 2.3 MByte)|
Texas Instruments announced September 17, 1971 the "calculator-on-a-chip" and Bowmar/Ali Inc. of Acton, Massachusetts, USA. introduced the famous 901B "True-Pocket-Size" calculator based on the TMS0103 with a suggested retail price (SRP) of $240.00.
It took less than one year before Texas Instruments announced the
TI-2500 Datamath calculator in
April 1972 with a SRP of only $149.95, its delivery in June 1972 to first
customers in the Neiman-Marcus and Sanger-Harris department stores in Dallas, TX
and its formally introduction on September 21, 1972. The SRP of the
TI-2500 was reduced to $119.95
by the date of its introduction.
Dismantling the featured Bowmar 901B manufactured in February 1972 reveals not only the TMS0103, but four Texas Instruments display drivers, the original Klixon™ keypad and a Bowmar made Opto-stic LED display.
Compare this Bowmar 901B with the Mariner NRC7200 sporting LED displays from Monsanto.
Digging in the history of portable electronic calculators? Don't miss the Sanyo ICC-804D, Sharp EL-8 and Rapidman 800.
Later with the Bowmar 901D a similar calculator with a 10 digit display was sold.
This calculator was sold under different labels, beside this Bowmar 901B it was popular as Commodore C110 and Craig 4501, too. A very similar design was introduced by Columbia with the Scientific. Don't miss the minirex 73, the eastern copy from GDR company RFT and the Heathkit IC-2009. The Litronix Checkmate looks similar but is completely different.
If you are familiar with the Klixon™ keyboard, have a closer look on the following machines: All three calculators were manufactured by Texas Instruments and use this keyboard:
• Montgomery Ward P800
• Longines Symphonette EC
Compare this 901B with later products like the MX-55.
Bowmar Instruments was one of the first casualties of the Calculator Wars and filed in 1976 for bankruptcy. Don't miss a mystery calculator with the Bowmar brand introduced in 1977!
Klixon™ is a trademark of Texas Instruments.
If you have additions to the above article please email: email@example.com.
© Joerg Woerner, December 5, 2001. No reprints without written permission.