DATAMATH CALCULATOR MUSEUM
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|
|Program steps:||Courtesy of:||Joerg Woerner|
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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© Joerg Woerner, August 4, 2012. No reprints without written permission.