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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 card-edge bus connector cables.
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).
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://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://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