Voyagers and Scientific Notation Mode

[Eddie W. Shore]

This issue was brought to our attention by Alex Garza.

In SCI mode, when the number of decimal places are high, the number on the display is not rounded appropriately. Garza mentioned that this happens on the HP 15C.

Calculators used:
HP 15C CE: HP 15C Collector's Edition (2023)
HP 11C: HP 11C (1981)


45.55555555 -> R1

SCI 2
HP 15C CE: 4.56 01
HP 11C: 4.56 01

SCI 4
HP 15C CE: 4.5556 01
HP 11C: 4.5556 01

SCI 6
HP 15C CE: 4.555556 01
HP 11C: 4.555556 01

SCI 7, 8, 9
HP 15C CE: 4.555555 01
HP 11C: 4.555555 01


1234.56789 -> R2

SCI 2
HP 15C CE: 1.23 03
HP 11C: 1.23 03

SCI 4
HP 15C CE: 1.2346 03
HP 11C: 1.2346 03

SCI 6
HP 15C CE: 1.234568 03
HP 11C: 1.234568 03

SCI 7, 8, 9
HP 15C CE: 1.234567 03
HP 11C: 1.234567 03

pi -> R3

SCI 6
HP 15C CE: 3.141593 00
HP 11C: 3.141593 00

SCI 7, 8, 9
HP 15C CE: 3.141592 00
HP 11C: 3.141592 00


I think that the blank space plus the two-digit exponent is shown on top of the mantissa, but this is just my opinion and educated guess. We can use the RND (round to the fixed decimal setting) and the number rounds correctly.