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Texas Instruments Minimath Version 0 - Early Prototype

Date of introduction:  Never Display technology:  LCD transmissive
New price:   Display size:  8
Size:  5.5" x 3.0" x 1.7"
 139 x 76 x 42 mm3
   
Weight:  7.0 ounces, 199 grams Serial No:  19
Batteries:  6*AA Date of manufacture:  wk 52 year 1971
AC-Adapter:  AC9100 Origin of manufacture:  USA
Precision:   Integrated circuits:  TMS0111
Memories:      
Program steps:   Courtesy of:  Joerg Woerner

The famous TI-2500 Datamath calculator was first announced in April 1972 with a suggested retail price (SRP) of $149.95. Beginning June 1972 first customers got in the Neiman-Marcus and Sanger-Harris department stores in Dallas, TX their calculators before the formally introduction on September 21, 1972.

The Minimath calculator represent Texas Instruments effort in the LCD (Liquid-Crystal-Display) technology. One limitation of the early Datamath calculator was the short operation time although it uses 6 of the expensive NiCd-cells. A short analysis of the overall power consumption demonstrates easily that the light-emitting-diodes in conjunction with the necessary display drivers are the power hungry parts in the calculator design.

The TMS0100 "Calculator-on-a-Chip" itself was designed in a low-power PMOS-process. Engineers at Texas Instruments started the design of a LCD for the Datamath and named the calculator "Minimath".

The Minimath uses the TMS0111 variation of the TMS0100 design.

The Minimath uses a transmissive LCD instead of todays reflective LCD's and added a lightpath to illuminate the display with the ambient light from the back.

Because of the short life expectancy of the LCD's at that time, Minimath was never put into production but defined already the design of the Datamath First Series calculators.

 

Minimath™ is a trademark of Texas Instruments.


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If you have additions to the above article please email: joerg@datamath.org.

© Joerg Woerner, August 4, 2012. No reprints without written permission.