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 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

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	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

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	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