Early
Electronic
Calculator		 Sharp Compet 17 Calculator

Manufacturer: Sharp
Model: Compet 17
Year: 1968
Form: Desktop
Functions: Basic four, constant mode
Number of Digits: 12
Display Type: NIX
Display:Hitachi CD81
Logic Technology: DIS,SSI,MSI
Memory Technology: MSI-MOS
Diodes: 440 = (112+50+6) + 15*4 + 1*4 + 38*5 + 4*5
Transistors: 73 = 20 + 51 + 2
Principal ICs: JMOS (µPD1)
IC Complement:NEC µPD1 (7)
NEC µPD2 (12)
NEC µPD3 (3)
NEC µPD4 (7)
NEC µPD5 (6)
NEC µPD6 (9)
NEC µPD7 (13)
(57 total)
Tech. Data Level: 2
Tech. Data Source: RE
Tech. Data Pages: 17
Tech. Data:list

Anomalies:
  • Entering more numerals after pressing the decimal point than the decimal point position switch is set for will produce odd results.

Notes:
  • A couple of switches connected appropriately to the remote connector inside the machine permit the calculator to be manually single-stepped through the state cycles of an operation. See the CMU page for more explanation, and the schematic for details.
  • See the Compet 17 simulation.

- Unit Log -

Serial Number: 810591T
Year of Manufacture: 1968 (transistors stamped with 8K, capacitor with 6749)
Date of Receipt: 10 Jul 2000
Source: Polsons Office Supply.
State upon Receipt: Minor scratches, functional.

Date: 11 Jul 2000
Procedure: Cleaned.

Date: 26 Jul 2000
Procedure: Short removed from between 4th and 5th 300K resistors (manufacturing flaw).

Date: 26 Jul 2000
Procedure: Burned out multiply and divide lamps replaced with LEDs and 900 ohm (1.8K/2) resistors in common ground lead.

Date: 29 Oct 2004
Procedure: Controller/Monitor Unit constructed. Some changes to schematic regarding the remote connector and keyboard.

Date: 29 Oct 2004
Procedure: TO DO: Simulation should be updated to reflect change of BUSY to IDLE, and P-cycle generation.


  Sharp Compet 17
Calculators | Integrated Circuits | Displays | Simulations
EEC 		bhilpert