Types Of Memory - Orchid PCturbo 286e User Manual

PCturbo 286e
TYPES OF MEMORY
To understand the Turbo, it is helpful to know
the types of memory available in your system.
Memory is organized as follows:
The first 640 kilobytes (the memory between
the addresses OK and 640K) is called
DOS Memory because it is compatible with
PC-DOS and MS-DOS. Some systems, like the
AT, have memory above I megabyte, called
Protected Memory.
o Protected Memory is frequently referred
to as Extended Memory, but this manual
will use the term Protected Memory.
The DOS memory between 640K and 704K (64 \-./
kilobytes) can be used as DOS memory if the
jD=704 flag is specified in the Turbo command.
This is provided as an option because certain
DOS programs will not operate correctly in a
system with more than 640 kilobytes.
DOS Memory can be used by your existing
programs running under DOS. Protected memory
can be used by software written specifically
for AT-compatible systems using 80286.