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: 5.2 MByte)

This rare BA-III is an unusual calculator within the second generation slanted family. We are used to find a direct counterpart with scientifical 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 oldfashioned 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 behaviour from the TI-60

TI-BAIII_PCB.jpg (20950 Byte)If we dig deeper into the calculator we loacte 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 fuctions and display capability in the second generation slanted housing. 

Don't miss 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.