HP 11C internal number format?

[Dieter]

(03-17-2018 08:03 PM)michaelzinn Wrote:  I'd like to know what is going on inside registers and on the stack. How are numbers represented internally? Is it decimal or binary? How precise is it? How does rounding or other numerical things behave?

The basics are covered in this article on the museum website.

Most internal arithmetics are done in 13-digit precision which finally are rounded to 10 digits before they are returned to the display. A common method is adding 500 to the last three digits (11...13) and then return the first 10 digits.

Dieter