DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-1798 (Malaysia)
|Date of introduction:||1990||Display technology:||LCD|
|New price:||Display size:||8|
|Size:|| 5.4" x 4.1" x
136 x 106 x 29 mm3
|Weight:||3.5 ounces, 99 grams||Serial No:|
|Batteries:||LR54||Date of manufacture:||mth 03 year 1991|
|AC-Adapter:||Origin of manufacture:||Malaysia (I)|
|Precision:||8||Integrated circuits:||Toshiba T9731BU|
|Program steps:||Courtesy of:||Joerg Woerner|
stylish small desktop calculator fits somewhere between the TI-1795A
and the TI-1775 in Texas
Instruments' small desktop calculator portfolio. Main difference
is the [GPM] key, a feature not known from the first generation
TI-1798 introduced already in 1986.
Dismantling this TI-1798 manufactured in March 1991 by Inventec Corporation in Malaysia reveals a clean design centered around a Toshiba T9731BU 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 like its identical twin TI-510 manufactured for the European market. The battery wasn't used with the first production batches of the TI-1798 manufactured in Taiwan.
Inspecting the PCB of this TI-1798 calculator brought our attention to a small mark reading 1OSB863-01B and we started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, March 21, 2020. No reprints without written permission.