<operating system> Software for MS-DOS or Microsoft
Windows which originally ran on the 16-bit Intel 8088 and
80286 microprocessors. These used a segmented address
space to extend the range of addresses from what is possible
with just a 16-bit address. Programs with more than 64
kilobytes of code or data therefore had to waste time
switching between segments. Furthermore, programming with
segments is more involved than programming in a flat address
space, giving rise to warts like memory models in C and
C++.
