systems, the 640K of memory located at linear addresses 00000000-0009FFFF. The lower part of this region (00000000-000005FF) is generally reserved for the interrupt
vector table and the BIOS
data areas, while the remainder, minus any memory taken up by TSR
programs and device driver
modules, is available as the Transient Program Area
Conventional memory is a very important system resource in MS-DOS systems.