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[[File:Tek21-31.jpg|right|300px|thumb|Tektronix 21 and 31 calculators]]
{{Instrument Sidebar
|manufacturer=Tektronix
|model=31
|class=Computer
|series=31
|summary=Programmable desktop calculators
|image=Tek21-31.jpg
|caption=Tektronix 21 and 31 calculators
|introduced=1973
|discontinued=(?)
|designers=
|manuals=
* [[Media:Tek 21 and 31 prelim no ocr.pdf|Tektronix 21 and 31 Preliminary Manual (PDF, needs OCR)]]
* [https://w140.com/tek_21_31_calc_interfacing.pdf Tektronix 21 and 31 calculators interfacing information]
* [[Media:Tek 21 31 calculator interface preliminary.pdf|Tektronix 21 and 31 Preliminary Interfacing Manual (PDF, needs OCR)]]
* [[Media:070-1575-00.pdf|Tektronix 31 Operators Manual (PDF, OCR)]]
* [[Media:P7001_Calculator_Aided_Measurements.pdf|P7001/31 Calculator Aided Measurements (PDF)]]
* [[Media:062-1642-00.pdf|Tektronix 31 PROM Preparation Instructions (PDF)]]
* [[Media:062-1593-00.pdf|Tektronix 31 Mathematics Program Library Volume 1 (PDF, OCR)]]
}}
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.
They feature a complete set of transcendental functions.  The 21 supports simple programs (sequences of keystrokes) whereas the 31 supports conditional branching and subroutines.
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The ''31/10 Graphic Calculator System'' was a bundle of a model 31 with a [[4010]]-1 graphics terminal, interface and software collection.
The ''31/10 Graphic Calculator System'' was a bundle of a model 31 with a [[4010]]-1 graphics terminal, interface and software collection.
==Manuals==
* [[Media:Tek 21 and 31 prelim no ocr.pdf|Tektronix 21 and 31 Preliminary Manual (PDF, needs OCR)]]
* [http://w140.com/tek_21_31_calc_interfacing.pdf Tektronix 21 and 31 calculators interfacing information]
* [[Media:Tek 21 31 calculator interface preliminary.pdf|Tektronix 21 and 31 Preliminary Interfacing Manual (PDF, needs OCR)]]
* [[Media:070-1575-00.pdf|Tektronix 31 Operators Manual (PDF, OCR)]]
* [[Media:P7001_Calculator_Aided_Measurements.pdf|P7001/31 Calculator Aided Measurements (PDF)]]
* [[Media:062-1642-00.pdf|Tektronix 31 PROM Preparation Instructions (PDF)]]
* [[Media:062-1593-00.pdf|Tektronix 31 Mathematics Program Library Volume 1 (PDF, OCR)]]


==Links==
==Links==
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[[Category:Computers]]
[[Category:Computers]]
[[Category:Introduced in 1973]]
Retrieved from "https://w140.com/tekwiki/wiki/31"