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[[File:Tek21-31.jpg|right|300px|thumb|Tektronix 21 and 31 calculators]] | [[File:Tek21-31.jpg|right|300px|thumb|Tektronix 21 and 31 calculators]] | ||
The '''Tektronix 31''' | The '''Tektronix 21''' and '''Tektronix 31''' are programmable desktop calculators. | ||
The 31 features program branching and a complete set of transcendental functions. | |||
They are built around a custom LSI chip set. | |||
Several interfaces were available: | Several interfaces were available: | ||
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==Links== | ==Links== | ||
* [http://www.oldcalculatormuseum.com/tek31.html Tek 31 @ oldcalculatormuseum.com | * [https://www.oldcalculatormuseum.com/w-tek21.html Tek 21] / [http://www.oldcalculatormuseum.com/tek31.html Tek 31] @ oldcalculatormuseum.com / [http://www.oldcalculatormuseum.com/s-tek31.html Spec sheet] / [https://oldcalculators.wordpress.com/2010/05/ blog post] | ||
* [https://youtube.com/watch?v=cNy_hjOqnps Tektronix 31 Programmable Desktop Calculator running a counter program from tape] @ YouTube | * [https://youtube.com/watch?v=cNy_hjOqnps Tektronix 31 Programmable Desktop Calculator running a counter program from tape] @ YouTube | ||
* [http://classiccmp.org/dunfield/calc/h/tekm31.jpg Tek 31 picture] / [http://www.classiccmp.org/dunfield/calc/h/tekm31b.jpg back side] | * [http://classiccmp.org/dunfield/calc/h/tekm31.jpg Tek 31 picture] / [http://www.classiccmp.org/dunfield/calc/h/tekm31b.jpg back side] | ||