Appendix A Using Memory; Types Of Memory - Epson Progression Setup Manual

Appendix A
Using Memory
Your computer comes with 4MB of memory, and you may have
installed additional memory-either with single inline memory
modules (SIMMs) or a memory card-to increase the total
amount. 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
memory
0
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 memory (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.
Resewed
memory
64OKB 1MB
Extended
memory
Addresses
Using Memory A-1
128MB