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The '''Tektronix 31''' is a programmable desktop calculator. It features program branching and a complete set of transcendental functions.
[[File:Tek21-31.jpg|right|300px|thumb|Tektronix 21 and 31 calculators]]
 
The '''Tektronix 21''' and '''Tektronix 31''' are programmable desktop calculators.  
It is built around a custom LSI chip set.
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:
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* [[153 | Model 153 Tektronix Instrument Interface]]
* [[153 | Model 153 Tektronix Instrument Interface]]
* [[154 | Model 154 RS-232C Interface]]
* [[154 | 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.  
These connect to the calculator through a [[012-0049-01|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).
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.
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.


==Manuals==
==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]
* [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)]]


==Links==
==Links==
* [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://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]
==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 ==
<gallery>
Tek 31 1.jpg
Tek 31 2.jpg
Tek 31 3.jpg
Tek 31 vt.jpg
</gallery>


[[Category:Computers]]
[[Category:Computers]]
[[Category:Introduced in 1973]]
[[Category:Introduced in 1973]]

Revision as of 02:39, 25 August 2019

Tektronix 21 and 31 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:

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.

Manuals

Links

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