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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 21''' and '''Tektronix 31''' are programmable desktop calculators. | The '''Tektronix 21''' and '''Tektronix 31''' are programmable desktop calculators. | ||
They feature a complete set of transcendental functions. The 21 supports simple programs (sequences of keystrokes) whereas the 31 supports conditional branching and subroutines. | |||
Several interfaces were available: | Several interfaces were available: | ||