HP 15c Collector's Edition User Manual

Section 10: The Index Register and Loop Control 117
An exception is in the case of f where the display format number in R
I
may range from −6 to +9. (This is discussed in Appendix E on page 247.) A
number less than zero will not affect the display format, but will affect
accuracy with this function.

HP 15c Collector's Edition Specifications

General

Brand	HP
Model	15c Collector's Edition
Category	Calculator
Language	English