IEEE Std 854-1987, the Standard for Radix-Independent Floating-Point Arithmetic, was the first Institute of Electrical and Electronics Engineers (IEEE) international standard for floating-point arithmetic with radix 2 or radix 10.
The standard was published in 1987, was almost immediately superseded by IEEE 754-1985, but was never terminated (the year of ratification appears after the dash). IEEE 854 did not specify any formats, whereas IEEE 754-1985 did. IEEE 754 specifies floating-point arithmetic for both radix 2 (binary) and radix 10 (decimal), and specifies two alternative formats for radix 10 floating-point values. IEEE 754-1985 was superseded in 2008 by IEEE 754-2008. IEEE 754-2008 also has many other updates to the IEEE floating-point standardisation.