Q . What is base memory or conventional memory ?
The original PC/XT type system was designed to use 1 M of
memory workspace sometimes called RAM . This !m of RAM is divided into
several section. Some of which have uses. DOS can read and write to entire
megabyte, but can manage the loading of program only in the portion of ram
space called conventional memory. which at time the first PC was introduced
was 512k. The other 512K was reserved for use by the system itself, including
the motherboard and adapter boards plugged into system slot.
IBM decided sfter introducing the system that only 384K was
needs for these reserved uses, and the company began marketing PCs with
640K of user memory. Thus, 640K became the standard for memory that can
be used by dos for running programs, and is often termed the 640K memory
barrier. The remaining memory after 640K was reserved for use by the
graphics board, other adapters, and the mother board ROM BIOS.
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