LowMem
LowMem refers to a region of memory in personal computers, particularly prevalent in the MS-DOS and early Windows operating systems. This memory area, typically the first 640 kilobytes (KB) of RAM, was reserved for the operating system and applications. The architecture of the IBM PC and its compatibles dictated that this segment of memory was the primary location for program code, data, and the BIOS (Basic Input/Output System).
As software became more complex and demanding, the limited size of LowMem became a significant bottleneck.
The concept of LowMem is largely historical, as modern operating systems and hardware utilize significantly larger