Casio fx-115N

[ijabbott]

(11-05-2021 02:37 AM)Ren Wrote:  I have a Casio fx-411 which I bought back in the 1980s because it does bin, hex, decimal conversions.
(I couldn't afford an HP-16C at the time)
Around the same time RadioShack sold a nearly identical calculator, but it had < and > buttons on the lower right of the right side (hinged) keyboard.

The one with the < and > keys would be a re-branded fx-451 or fx-451M. The Casio calculators in this series are:

• fx-411 - the original, with 8+2 digits and 54 keys.
• fx-450 - with 10+2 digits and 54 keys, plus physical constants.
• fx-451 - with 10+2 digits and 56 keys, physical constants and unit conversions.
• fx-451M - like fx-451 but with smaller solar cell, plus battery backup.