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.

Not all machines are boring: occasionally even four function calculators can be interesting.Four-Function Calculators |
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- | Model |
Type | Display | Programming model | Programming features | Memory | Special functions |

Casio CFX-200 |
Scientific watch | 8 LCD digits | N/A | N/A | 1 register | One of only two scientific calculator watches ever made | |

Casio SL-800 |
Four-function solar | 8 LCD digits | N/A | N/A | 1 register | Thinnest calculator ever made | |

Elektronika B3-08 |
Four-function | 8 VFD digits | N/A | N/A | N/A | N/A | |

HP-01 |
Four-function watch | 8 LED digits | N/A | N/A | 1 register | Time functions | |

SCM Marchant I |
Four-function | 8 Nixie digits | N/A | N/A | N/A | Nixie portability! | |

SR-10 |
Four-function | 8 LED digits | N/A | N/A | N/A | Prototype |

Some scientific models are sufficiently unique to deserve special mention.Scientific models |
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- | Model |
Type | Display | Programming model | Programming features | Memory | Special functions |

Commodore SR-4190R |
Scientific | 10+2 LED digits | N/A | N/A | 2 registers | Advanced statistical functions, complex numbers, integration | |

HP-91 |
RPN Scientific | 10+2 LED digits | N/A | N/A | 16 registers | Printing | |

MR 610 |
Scientific | 8+2 LCD digits | N/A | N/A | 1 register | N/A | |

Radio Shack EC-4016 |
Scientific solar | 10+2 LCD digits | N/A | N/A | 1 register | Solar power | |

Sharp EL-5001 |
Scientific | 10+2 VFD digits | N/A | N/A | 3 registers | Preprogrammed functions | |

TI-30 |
Scientific | 8 (5+2) LED digits | N/A | N/A | 1 register | N/A | |

TI-45 |
Scientific | 8+2 LCD digits | N/A | N/A | 1 register | Printing | |

SR-50 |
Scientific | 10+2 LED digits | N/A | N/A | 1 register | N/A |

These, of course, are the most interesting calculators: machines built for a special purpose, a specialty application.Special-purpose machines |
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- | Model |
Type | Display | Programming model | Programming features | Memory | Special functions |

Al Hassibah 2000 |
Bi-numerical (arabic) calculator | 8 LCD digits | N/A | N/A | 1 register | Arabic numeral display, time functions, alarm | |

Carrier Ductronic |
Duct sizing calculator | 8 LCD digits | N/A | N/A | N/A | Duct calculations | |

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 |