DATAMATH CALCULATOR MUSEUM
Texas Instruments BA-20 Profit Manager (1991)
|Date of introduction:||July 1991||Display technology:||LCD|
|New price:||Display size:||10|
|Size:|| 4.7" x 5.0" x
120 x 128 x 20 mm3
|Weight:||3.9 ounces, 110 grams||Serial No:|
|Batteries:||LR41 (30µA)||Date of manufacture:||mth 08 year 1997|
|AC-Adapter:||Origin of manufacture:||Malaysia (I)|
|Precision:||10||Integrated circuits:||Inventa LI3163|
|Program steps:||Courtesy of:||Joerg Woerner|
with the original design of the BA-20 Profit Manager introduced in 1986 this later model lacks
the switch to select between battery and solar cells operation.
Dismantling this BA-20 Profit Manager manufactured in August 1997 by Inventec Corporation in Malaysia reveals a clean design centered around an Inventa LI3163 single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and powered by four solar cells. The small LR54 (LR1130) backup battery from the first design disappeared apparently with the switch. We couldn't locate any differences with a BA-20 manufactured in July 1990 by Compal Electronics in Taiwan.
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 IOBA20-02B, 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.
The third generation of the BA-20 Profit Manager introduced in 2000 omitted the integrated clock.
In Europe a very similar calculator was sold as TI-620.
Don't miss the rare TI-10 Profit Guide combining similar functions in a much smaller housing.
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, December 25, 2001. No reprints without written permission.