HP 48g Graphing Calculator - Manual (Page 77)

No Room To Show Stack—This message appears when the HP 48
completes all pending operations but doesn’t have enough free
memory to display the stack. When this occurs, the stack displays
objects only by type: Real Number, filgebraic, and so on. The
amount of memory required to display a stack object varies with the
object type.
Remedy: Delete unnecessary variables and unneeded objects from
the stack, or store stack objects in variables so they don’t have to be
displayed.
Out of Memciry—In extreme cases, the calculator runs completely
out of memory and is unable to do anything. In this situation you
must clear some memory before you can continue. The HP 48
activates a special procedure to do this, and shows this display:
Out of Memory
Purge?
l: Real Array
madtm mnni
When the procedure starts, the HP 48 asks whether you want to
purge the object (described by object type) in level 1 (a real array
in the above figure). If you delete it, the calculator then asks about
the new level 1 object. This continues until the stack is empty or
you respond to the display by pressing HO . The calculator then
asks if you want to discard the contents of L j \ST CMD, and then
asks in the following order if you want to delete other items:
1. Stack level 1 (repeated)
2. The contents of LAST CMD
3. The contents of LAST STACK (if active)
4. The contents of LAST ARC (if active)
5. The variable PICT (if present)
6. Any user-key assignments
7. Any alarms
8. The entire stack (unless already empty)
9. Each global variable by name
10. Each port 0 object by tagged name
Memory 5-19