Texas Instruments BA-III Executive Business Analyst

Date of introduction:  1986 Display technology:  LCD
New price:   Display size:  10 (7 + 2)
Size:  5.8" x 2.8" x 0.85"
 147 x 72 x 22 mm3
Weight:  3.0 ounces, 84 grams Serial No:  
Batteries:  2*LR44 Date of manufacture:  wk 48 year 1990
AC-Adapter:   Origin of manufacture:  Italy
Precision:  12 Integrated circuits:  TP0458B/CD4812
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (US: 5.2M Bytes)

This rare BA-III is an unusual calculator within the second generation slanted family. We are used to find a direct counterpart with scientific functions for each calculator. Here we fail!

The first slanted calculator appeared with the TI-55-II already in the year 1981. It uses a different architecture compared with the earlier slimline calculators, e.g. two calculator chips of the TP0456 (CD4556) family. This allowed the usage of a 8+2 display compared with the 5+2 display and 45 keys instead the 40 keys found with the slimline calculators. 

The second generation slanted calculators starting with the TI-55 III differed from the first generation mainly in the keyboard design. Nevertheless the old-fashioned electronics based on the TP0320 (CD3202) from the slimline calculators could be found in the slanted housing, too. Don't miss the TI-53.

This BA-III uses a display with 10 digit resolution, in engineering mode it changes to 7+2 digits. We know this behavior from the TI-60

TI-BAIII_PCB.jpg (20950 Byte)If we dig deeper into the calculator we located the calculator-chip, a TP0458B (CD4812) chip. This gives us a good picture of the BA-III: A calculator similar to the earlier BA-II with some enhancements in both functions and display capability in the second generation slanted housing. 

Don't miss the prototype of a BA-III that never materialized and the later BA II PLUS.

The BA-III is featured in the Texas Instruments France SA leaflets ECD044F and ECD488F dated 1987 resp. 1988.

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If you have additions to the above article please email:

Joerg Woerner, December 15, 2001. No reprints without written permission.