Early
Electronic
Calculator
Texas Instruments SR-11 Calculator

Manufacturer: Texas Instruments
Model: SR-11
Year: 1974
Form: Pocket
Functions: Basic four, square root, square, reciprocal, pi, scientific notation.
Number of Digits: 8 + 2
Display Type: LED (MAN3-style individual)
Logic Technology: LSI
Diodes: 16
Transistors: 9
IC Complement:Texas Instruments TMS 0602
Texas Instruments SN75494 (2)
ITT 27915 (2)
(5 total)
Batteries: 3 NiCd
Power Connector:(?) VAC, sub-mini audio
(alternate/no batteries: 4 to 6 VDC, + tip)
Tech. Data Level: 2
Tech. Data Source: RE
Tech. Data Pages: 1
Tech. Data:Schematic (pdf)

 


- Unit Log -

Serial Number: SR-11539355
Year of Manufacture: 1974 (SN75494 ICs stamped with 7410.)
Date of Receipt: 13 May 2001
Source: Hastings V. V.
State upon Receipt: Good physical condition except for corrosion on battery connectors. Functional.
Current State: Array


Date: 30 May 2001
Procedure: Cleaned. Battery connectors removed, power connector wiring redone.


Date: 30 Nov 2022
Procedure: Keyboard unsoldered temporarily for reverse engineering.


Date: 30 Nov 2022
Procedure: Mantissa negative-sign segment not working.



  Texas Instruments SR-11
Calculators | Integrated Circuits | Displays | Simulations
EEC
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