beautypg.com

Hemon – HP 48g Graphing Calculator User Manual

Page 59

Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".

background image

5

Hemon

The HP 48 has two types of memory:

m Read-only memory (ROM). ROM is memory that’s dedicated to

specific operations and cannot be altered. The HP 48 has 512 KB

(kilobytes) of built-in ROM, which contains its command set.

Except for the HP 48G model, you can expand your calculator’s
ROM by installing plug-in application cards (described in chapter

28).

■ Random-access memory (RAM). RAM is memory that you can

modify. You can store data into RAM, modify its contents, and
purge it. Except for the HP 48G model, you can increase your

calculator’s RAM by adding memory cards (described in chapter

28).

RAM is also called

vser memory

because it’s memory that you (the

user) have access to. You use or manipulate user memory when you

enter an object on the stack, save an object in a variable, delete
a variable, create an equation or matrix, run a program, etc. In

addition, the HP 48 periodically performs a system cleanup to free

memory for use.

The figure on the next page illustrates how the built-in RAM in the

HP 48 is organized. Note that the figure is not to scale.

Memory 5-1

This manual is related to the following products: