HP 49g+ - Manual (Page 766)

Page 26-1
Chapter 26
Managing memory
In Chapter 2 of the User’s Guide we introduced the basic concepts and
operations for creating and managing variables and directories. In this
Chapter we discuss the management of the calculator’s memory in terms of
partition of memory and techniques for backing up data.
Memory Structure
The calculator contains a total of 2.5 MB of memory, out of which 1 MB is
used to store the operating system (system memory), and 1.5 MB is used for
calculator operation and data storage (user’s memory). Users do not have
access to the system memory component. To see the way in which the user’s
memory is partitioned, use the FILES function (
„¡). A possible result is
shown below:
This screen indicates the existence of three memory ports, besides the memory
corresponding to the HOME directory (See Chapter 2 in the User’s Guide).
The memory ports available are:
• Port 0, labeled IRAM
• Port 1, labeled ERAM
• Port 2, labeled FLASH
Port 0 and the HOME directory share the same area of memory, so that the
more data stored in the HOME directory, for example, the less memory is
available for Port 0 storage. The total size of memory for the Port 0/HOME
directory memory area is 241 KB.
Port 1 (ERAM) can contain up to 255 KB of data. Port 1, together with Port 0
and the HOME directory constitute the calculator’s RAM (Random Access