Hewlett-Packard 80 Calculator

Manufacturer: Hewlett-Packard
Model: 80
Year: 1973
Form: Pocket
Functions: RPN Business
Number of Digits: 10
Display Type: LED
Display:Hewlett-Packard 1990-0335
Logic Technology: LSI
Diodes: 7
Transistors: 4
IC Complement:Hewlett-Packard 1818-0012
Hewlett-Packard 1820-0848
Hewlett-Packard 1820-0854
Hewlett-Packard 1820-1029
Hewlett-Packard 0865-1993-U
Hewlett-Packard 1813-0024
(6 total)
Batteries: 3 AA NiCd
Power Connector:3.8 VDC, 3-pin special
Tech. Data Level: 2
Tech. Data Source: RE
Tech. Data Pages: 1
Tech. Data:Schematic (pdf)

The HP-80 is at root the HP-35 reprogrammed with some business functions. Note the ENTER key has been relabelled as SAVE, although it's still a 4-level RPN calculator. The display will flip into scientific mode for large values but there is no Enter-Exponent key.

Disassembled to major components.

The flip side.

The electronics are contained on two boards. Note the 1973 date codes on the ICs although the serial number implies 1972.

- Unit Log -

Serial Number: 1247A29099
Year of Manufacture: 1973 (IC date code 7315)
Accessories: Charger, hard case, carrying case.
Date of Receipt: Jun 2014
Source: RF.
State upon Receipt: Good. Functional.
Current State: Functional except intermittent operation when switched on (battery contacts or power switch) (Aug 2014).

Date: 05 Aug 2014
Procedure: Power switch slider was broken. Glued.

Date: 05 Aug 2014
Procedure: Schematic drawn.

Date: 06 Aug 2014
Procedure: Dismantled for cleaning. Intermittent operation gone upon reassembly.

  Hewlett-Packard 80
Calculators | Integrated Circuits | Displays | Simulations