HP 48g Graphing Calculator - Manual (Page 17)

Annunciators (continued)
Symbol Meaning
FiflD Radians angle mode is active.
nPHD Cra.ds angle mode is active.
R.iZ Polar/CylindricaJ coordinates mode is active.
Polar/Spherical coordinates mode is active.
HFlLT Program execution has been halted.
1 2 3 4 5 The indicated user flags are set.
1 Li SR The user keyboard is active for one operation.
USER The user keyboard is active until you press fi^fUSER).
FiLG Algebraic-entry mode is active.
PRG Program-entr).' mode is active.
The Stack
The stack is a series of memory storage locations for numbers and
other objects. The locations are called levels 1, 2, 3, etc. The number
of levels changes according to how many objects are stored on the
stack—from none to hundreds.
As you enter new numbers or other objects on the stack, the stack
grows to accommodate them: the new data moves into level 1, and
older data is '‘bumpecr to higher levels. As you use data from the
stack, the number of levels decreases as the data, moves down to lower
levels.
The stack display shows level 1 and up to three additional levels.
Any additional levels are maintained in memory, but normally aren’t
displayed.
For more information about the stack and command line, see “Using
the Stack for Calculations’’ on page 3-1.
The Keyboard and Display 1-3