Also known as the Triumph-Adler EC1M (and built by Omrom in Singapore), the 814 was a large desktop calculator from 1973 built using LSI discrete logic. The calculator came in mains powered (as in my example) or battery powered versions. The calculator has the basic arithmetic functions and a memory. The calculator is designed for heavy duty number crunching in the likes of accounts or payroll departments and has a fold out stand on the back.
There are also a few other function keys along the left-hand side, what A, K, CA and CI do i don't know (though on other calculators K is used for carrying out calculations using a constant), unfortunately the calculator is non-operational. Similarly there is a sliding switch above the display, perhaps something to do with number of decimal places displayed? The display is an eight digit VFD (vacuum fluorescent display).
