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DATAMATH CALCULATOR MUSEUM

Texas Instruments TI-1680

Date of introduction:	1977	Display technology:	Fluorescent
New price:	$29.95, £22.95	Display size:	8
Size:	5.0" x 3.0" x 0.5"
Weight:		Serial No:	992365
Batteries:	Custom made	Date of manufacture:	wk 07 year 1978
AC-Adapter:	AC9232, AC9131	Origin of manufacture:	USA
Precision:		Integrated circuits:	TMC1981, TMC0999
Memories:	1 + 20 Playback
Program steps:		Courtesy of:	Joerg Woerner

The TI-1600, TI-1650 and the TI-1680 were very flat calculators compared to the previous TI-1200 models. Only one year in front of the first pocket-sized LCD-calculators you could carry them in your shirt.

With this tiny calculator Texas Instruments introduced a new calculator feature, the Playback or replay mode. Similar to a paper printout you can scroll back up to 20 of your entries and do some corrections. This technology was used in the TI-2550-IV, too.

Read more about the memory operations possible with just the [M] and [MR] keys here.

Instead of the normal 9V battery used in other calculators a very flat (custom made by french company SAFT) rechargable battery is used. The first TI-1680 were sold with the AC9232 charger, later the manual was corrected and the AC9131 delivered.

Sales figures kept low, soon after the TI-1680 the first LCD-calculators appeared on the market.
According to Texas Instruments only between 10,000 and 20,000 units were manufactured.

If you have additions to the above article please email: joerg@datamath.org.