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The '''Tektronix 31''' | [[File:Tek21-31.jpg|right|300px|thumb|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: | Several interfaces were available: | ||
Line 7: | Line 7: | ||
* [[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 | 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== | |||
* [[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)]] | |||
==Links== | ==Links== | ||
* [http://www.oldcalculatormuseum.com/tek31.html Tek 31 @ oldcalculatormuseum.com | * [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] | |||
==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
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.
Manuals
- Tektronix 21 and 31 Preliminary Manual (PDF, needs OCR)
- Tektronix 21 and 31 calculators interfacing information
- Tektronix 21 and 31 Preliminary Interfacing Manual (PDF, needs OCR)
- Tektronix 31 Operators Manual (PDF, OCR)
- P7001/31 Calculator Aided Measurements (PDF)
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.