| This is the talk page for discussing improvements to the HP-42S article. This is not a forum for general discussion of the article's subject. |
Article policies
|
| Find sources: Google (books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL |
 | This article is rated Start-class on Wikipedia's content assessment scale. It is of interest to the following WikiProjects: | ||||||||||
| |||||||||||
Precision
edit--79.151.242.162 (talk) 11:49, 9 August 2015 (UTC) "25 digits internally" is not documented anywhere. Actually the old versions of the page have 15, which is what most people believe it is, that is 3 guard digits. After analysis of some particular results and the source code of other Saturn calculator (hpmuseum forum threads), apparently it works to double precision just for the trigonometric functions, that's all. No register is stored to "25 digits" and no other operation is performed to "25 digits", it's a hidden trick to improve range reduction.