Appendix 1: Memory Basics; Al.1 Description Of Memory - Everex EV-159 Owner's Manual And Reference Manual

Appendix
1:
Memory Basics:
AI.I Description Of Memory
The RAM 3000 Deluxe is designed to provide up to three
megabytes of extended memory for AT-compatible ma-
chines. In addition, up to three megabytes of memory on
the RAM 3000 Deluxe can be addressed as expanded
memory under the Lotus/Intel/Microsoft EMS specification
(Version 320). This board can also be used to upgrade base
memory to the 640K (9FFFFH) base memory limit imposed
by DOS. If you are not familiar with the distinction
between base, extended and expanded memory, refer to 'the
following explanations.
Base memory - memory from the 0 byte memory address up
to the 640K limit (OOOOOH-9FFFFH). This memory area is
usable by DOS for programs and data.
Extended memory - memory from 1 to 16 megabyte memory
address (lOOOOOH-FFFFFFH). This area can be used by the
A T or AT compatible to store data and programs. DOS
does not recognize this memory space, but certain programs
can use this memory space (notably the EDISK.syS RAM
disk utility and the OS/2 disk operating system).
Expanded memory - memory (specification developed by a
joint project of Lotus, Intel and Microsoft) that can be ac-
cessed by specially-modified software in order to overcome
the DOS-imposed
OK-640K (OOOOOH-9FFFFH)
memory
address limit for program data.
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