DATAMATH CALCULATOR MUSEUM
Texas Instruments Business Card
|Date of introduction:||1979||Display technology:||LCD|
|New price:|| $44.95 (SRP Sep. 1980)
$35.00 (October 1981)
|Display size:||8 (5+2)|
|Size:|| 3.7" x
2.2" x 0.25"
95 x 57 x 6 mm3
|Weight:||1.3 ounces, 38 grams||Serial No:|
|Batteries:||2*LR54||Date of manufacture:||wk 48 year 1979|
|AC-Adapter:||Origin of manufacture:||El Salvador|
|Program steps:||Courtesy of:||Joerg Woerner|
|Download manual:||(US: 4.1M Bytes)|
stylish Business Card looks different to all but two Texas Instruments products
know. It is the rare sibling of the TI-1760 DataCard
and the ultra-rare TI-1745 DataCard Time calculators
introduced in 1979. Main difference is the additional row of keys and the
2ND-key never found in a "Basic" calculator and even scientific
notation and an internal number representation with 11 digits resolution.
Nevertheless put we this unusual Financial calculator in the "Basic" section of
the Datamath calculator Museum.
A deeper exploration of the keyboard shows some financial function keys put as second function of the operation keys, a layout unknown with any other calculator developed by Texas Instruments.
Dismantling this Business Card calculator manufactured end of 1979 in El Salvador reveals a design very similar to the TI-1760 DataCard. We have no doubts that this unusual product uses a single-chip calculator circuit of the TP0320 family instead the simplified TP0311 family used with the Basic-line calculators. We know the TP0320 calculator chip from products like:
| TP0320 TI Investment Analyst
TP0322 TI-Business Analyst-II
TP0326 TI-38 and TI-20
Please notice the gap in the list between the entries TP0324 and TP0326. With both the TI-35 and TI-38 introduced in 1979, we suspect that the Business Card calculator makes use of a TP0325 single-chip calculator circuit.
Super slimline LCD for finance and business with Constant memory* feature.
So lightweight and compact that you can take it anywhere. Features positive action keys designed to feel right to your fingers.
© Texas Instruments, 1981
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© Joerg Woerner, January 22, 2003. No reprints without written permission.