DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-1250 (Version 3, Style 4B)
|Date of introduction:||March 1976||Display technology:||LED-stick|
|New price:||Display size:||8|
|Size:|| 5.5" x 2.8" x 1.4"
138 x 70 x 35 mm3
|Weight:||3.9 ounces, 110 grams||Serial No:||B 0252166|
|Batteries:||9V||Date of manufacture:||wk 49 year 1976|
|AC-Adapter:||AC9180||Origin of manufacture:||USA (LTA)|
|Program steps:||Courtesy of:||Joerg Woerner|
(US: 2.5M Bytes)
(EU: 3.5M Bytes)
TMS0952 introduced with the original design of the
TI-1200 and TI-1250 was soon replaced with the
TMS0972, a pin-compatible design dropping the additional resistors and capacitor and further reducing the manufacturing costs of the TI-1200 series.
Dismantling the featured TI-1250 with Date code 4976 LTA and manufactured in December 1976 in Lubbock, Texas reveals a very efficient and cost-optimized design with a single-sided printed circuit board (PCB) centered around a TMS0972 single-chip calculator circuit based on the TMS1000, the World's first Microcomputer.
The final step of cost reduction of the TI-1200/TI-1250 family was introduced just a few months before its discontinuation and included a smaller encapsulation of the TMS0972 Chip. While the original design was using a 0.6” wide 28-pin DIP (Plastic Dual In-line Package with a 0.1” / 2.54 mm lead pitch) encapsulation, switched the final design to a 0.4” wide 28-pin SPDIP (Shrink Plastic Dual In-line Package with a 0.07” / 1.778 mm lead pitch) encapsulation.
more about the evolution of the TI-1250 between
June 1975 and its discontinuation in 1977.
Learn more about the different Product Labels used with the TI-1250 - here at the Datamath Calculator Museum we classify the featured TI-1250 as Hardware Version 3, PCB Type 2 and Product Label Style 4, B-Series.
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© Joerg Woerner, June 28, 2021. No reprints without written permission.