DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-1890 Converter Kit
|Date of introduction:||1981||Display technology:||LCD|
$22 (October, 1981)
|Display size:||8 (5 + 2)|
|Size:|| 5.3" x 2.9" x
134 x 74 x 9 mm3
|Weight:||2.9 ounces, 82 grams||Serial No:||1946825|
|Batteries:||2*LR44||Date of manufacture:||wk 15 year 1983|
|AC-Adapter:||Origin of manufacture:||USA (ATA)|
|Precision:||9||Integrated circuits:||TP0455/CD4509 or TP0456/CD4559|
|Program steps:||Courtesy of:||Joerg Woerner|
|Download manual:||(US: 3.8 MByte)|
interesting machine based on a TI-35 is really a converter. Giving the
US citizens a
chance to work with the International SI units, it converts easily between
old-fashioned yards, inches, gallons and ounces to the modern meters, centimeters,
liters or grams. The TI Converter has 194 built-in conversions and was delivered
together with the "Calculator and Converter handbook" that guides
step-by-step through common household and work related projects.
Success in the United States? I don't think so, I used this machine to give you the above data in inches and ounces.
Comment from the editor: "I lived in Germany till June 24, 2006"
Interested in converting calculators? Have a look on the Cessna Sky/Comp.
Within the Datamath Museum the TI Converter is placed due to
the housing and calculator chip in the "Scientific Calculators" album,
nevertheless the number TI-1890 is the name of a BASIC calculator. Four years later the converter functions were
really adopted to basic
calculators, view the TI-1889.
The first calculator performing metric conversions was introduced already in 1974 with the Canon FC-80.
Recently fellow collector Stefan Klaes discovered an early TI-1890 Converter with a date code of ATA3781 (manufactured in Abilene, TX during week 37 of the year 1981). Dismantling this calculator reveals with the CD4509 single-chip calculator circuit the "buggy" version of the later CD4559 found in the pictured model on the left. Read more about the TP0455 and TP0456 CMOS calculator chips here.
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© Joerg Woerner, January 3, 2002. No reprints without written permission.