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Programmable calculatorsInteresting Non-Programmables
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My personal interest is programmable calculators, but in the course of collecting, I often pick up interesting non-programmable models. Then there are a few, like the Commodore SR-4190R or the Casio SL-800, that have been in my possession for many years, and are now part of my proud little collection. Here is a set of interesting machines that, despite being non-programmable, deserve their own Web page. Additionally, I have a small photo album of other calculators.

Four-Function Calculators
Not all machines are boring: occasionally even four function calculators can be interesting.
- Model Type Display Programming model Programming features Memory Special functions
Casio SL-800 Casio SL-800 Four-function solar 8 LCD digits N/A N/A 1 register Thinnest calculator ever made
Elektronika B3-08 Elektronika B3-08 Four-function 8 VFD digits N/A N/A N/A N/A
Hewlett-Packard HP-01 HP-01 Four-function watch 8 LED digits N/A N/A 1 register Time functions
SCM Marchant I SCM Marchant I Four-function 8 Nixie digits N/A N/A N/A Nixie portability!
Texas Instruments SR-10 SR-10 Four-function 8 LED digits N/A N/A N/A Prototype

 

Scientific models
Some scientific models are sufficiently unique to deserve special mention.
- Model Type Display Programming model Programming features Memory Special functions
Commodore SR-4190R Commodore SR-4190R Scientific 10+2 LED digits N/A N/A 2 registers Advanced statistical functions, complex numbers, integration
Hewlett-Packard HP-91 HP-91 RPN Scientific 10+2 LED digits N/A N/A 16 registers Printing
MR 610 MR 610 Scientific 8+2 LCD digits N/A N/A 1 register N/A
Radio Shack EC-4016 Radio Shack EC-4016 Scientific solar 10+2 LCD digits N/A N/A 1 register Solar power
Sharp EL-5001 Sharp EL-5001 Scientific 10+2 VFD digits N/A N/A 3 registers Preprogrammed functions
Texas Instruments TI-30 TI-30 Scientific 8 (5+2) LED digits N/A N/A 1 register N/A
Texas Instruments TI-45 TI-45 Scientific 8+2 LCD digits N/A N/A 1 register Printing
Texas Instruments SR-50 SR-50 Scientific 10+2 LED digits N/A N/A 1 register N/A

 

Special-purpose machines
These, of course, are the most interesting calculators: machines built for a special purpose, a specialty application.
- Model Type Display Programming model Programming features Memory Special functions
Al Hassibah 2000 Al Hassibah 2000 Bi-numerical (arabic) calculator 8 LCD digits N/A N/A 1 register Arabic numeral display, time functions, alarm
Carrier Ductronic Carrier Ductronic Duct sizing calculator 8 LCD digits N/A N/A N/A Duct calculations
Texas Instruments SR-22 Texas Instruments SR-22 Floating-point hexadecimal calculator 10+2 PFD digits N/A N/A N/A Hexadecimal and octal floating point calculations with exponent