Texas Instruments BA-20 Profit Manager

Date of introduction:  1986 Display technology:  LCD
New price:   Display size:  10
Size:  4.7" x 5.0" x 0.80"
 120 x 128 x 20 mm3
Weight:  3.9 ounces, 110 grams Serial No:  
Batteries:  LR41 + LR54 (30A) Date of manufacture:  mth 06 year 1986
AC-Adapter:   Origin of manufacture:  Taiwan (I)
Precision:  10 Integrated circuits:  Sharp LI3163
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
Download leaflet:   (US: 1.1 MByte)    

Texas Instruments Instruments introduced in the United States of America in 1985/1986 a family of three very similar calculators:

TI-1796: Basic desktop calculator with 10 digits display capability and "Dual Power" feature
TI-1798: TI-1796 with added clock module
BA-20 Profit Manager: TI-1798 with 6 added keys for COST, SELL, MARGIN calculations

Dismantling this BA-20 Profit Manager manufactured in June 1986 by Inventec Corporation in Taiwan reveals a clean design centered around a Sharp LI3163 single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and powered by four solar cells and a small LR54 (LR1130) backup battery.

Please notice the clock module used with the TI-1798 and BA-20 Profit Manager next to the calculator display is powered by its own small LR41 battery. Later designs like the stylish EUROPA 10 powered the clock module directly from the calculator electronics and omitted the extra battery.

Inspecting the PCB of this BA-20 Profit Manager calculator brought our attention to a small mark reading IOBA20-01C, we spotted similar PCB-Marks already with the TI-1796 and TI-1798. We started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.

This first generation BA-20 Profit Manager introduced in 1986 makes like its stable mates TI-1796 and TI-1798 use of a small sliding switch to select between the power sources. The second generation of the BA-20 Profit Manager replaced the switch by omitting the backup battery.

In Europe a very similar calculator was sold as TI-620.

Don't miss the BA-45 Micro Business Manager, TI-10 Profit Guide and the rare TI-5310 Business Manager.

The BA-20 Profit Manager is featured in the Texas Instruments Incorporated bulletin CL-885 dated 1986.


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If you have additions to the above article please email:

Joerg Woerner, December 25, 2001. No reprints without written permission.