Move – HP 48g Graphing Calculator User Manual
Page 60
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System
Available Memory
User Memory
; Home ; Port 0
1 1 1
1 1 1
A
B
C
D
1 1 1
! 1 1
E ; F G ; H
Partitions
move
depending on current allocation of memory
Schematic view of Built-In RAM in the HP 48
After a full memory reset, the calculator memory is returned to the
state it was in when shipped from the factory. The only items stored
in memory at that point are the built-in system variables (section A).
All other memory is available memory (C).
As you work with the calculator, available memory is allocated
automatically into the various regions shown in the figure above and
described below:
■ System Memory: This space is reserved by the RPL system.
You have no direct control of this space. It is divided into
non-exparidable and expandable sections:
a System Variable Storage (A): Non-expandable section containing
the values of all RPL system variables (such as
PICT)
and the
current locations of the “boundaries” between the remaining
expandable sections of RAM.
□ Temporary System Storage (B): Expandable section containing
temporary copies of objects being manipulated and the “return
stack” (a list of currently pending operations).
a Available Memory (C): Expandable section containing all
non-allocated RAM remaining after System and User Memory is
subtracted from the total configured memory.
a
User Memory: The memory available for your use. User memory is
further divided into five expandable sections:
Cl The Stack (D): Contains the objects currently on the stack.
5-2 Memory