Epson 7500 - Manual (Page 50)

Appendix A
U s i n g M e m o r y
Your computer comes with 4MB of memory, and you may have
installed additional memory. This appendix describes how the
memory in your computer works and gives guidelines for
using the appropriate memory manager program to control
your memory.
Types of Memory
A computer’s memory is divided into three types:
conventional, reserved, and extended. The diagram below
shows the relationships between these types of memory and
their addresses.
Conventional Resewed
memory memory
Extended
memory
0 640KB 1MB
Addresses
All memory in a computer is managed using addresses-
numbers that describe the location of each byte of data. Each
memory chip must have its own set of unique addresses so that
the operating system knows where to store and find data.
Conventional memo y (also called base memory) is memory that
the operating system recognizes and manages directly. The size
of conventional memory is limited to 640KB and has addresses
in the range 0 to 640KB.
Using Memo y A - l