HP -32S Owner's Manual page 154

Program line numbers always appear in base 10.
An annunciator tells you which base is the current setting. For in
stance, compare the program lines below in the left and right
columns. Notice that the hexadecimal number, like all non-decimal
numbers, is right-justified.
Decimal mode set
PROM
R99 HEX
PROM
R1Q
23
Hexadecimal mode set
PROM
R09 HEX
PROM
R10
Program line numbers
are always decimal.
HEX<H
HEX
1?
Current base mode set
152 10: Base Conversions and Arithmetic