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{{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. | ||
==Links== | ==Links== | ||
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[[Category:Computers]] | [[Category:Computers]] | ||
Revision as of 14:32, 18 August 2021
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:
- Model 152 General Purpose BCD Interface
- Model 153 Tektronix Instrument Interface
- Model 154 RS-232C Interface
These connect to the calculator through a 50-pin card-edge bus interface supporting DMA access at up to 125 kbyte/s. The bus uses open-collector TTL drivers and can be daisy-chained through multiple peripherals (which all have two matching bus connectors for this purpose). It must be terminated at the last unit.
The 31/10 Graphic Calculator System was a bundle of a model 31 with a 4010-1 graphics terminal, interface and software collection.
Links
- Tek 21 / Tek 31 @ oldcalculatormuseum.com / Spec sheet / blog post
- Tektronix 31 Programmable Desktop Calculator running a counter program from tape @ YouTube
- Tek 31 picture / back side
Internals
The 21 and 31 are built around a custom LSI chip set, the 156-0243-00 Adder-Subtracter, 156-0238-00 Working Register Storage, 156-0239-00/156-0240-00/156-0242-00 Function Decoding, 156-0235-00 Microcode Routine Address ROM, 156-0231-00 through 156-0234-00 Microcode ROM/Next Address Latch, 156-0237-00 Timing and Constant Storage ROM, 156-0236-00 K Register Storage and 156-0241-00 A & C Operation Control ROM. These chips were manufactured by American Microsystems, Inc. as full custom parts.
Pictures
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"Just married" advertising from 1973
