History
Originally systems programmers invariably wrote in assembly language. Experiments with hardware support in high level languages in the late 1960s led to such languages as PL/S, BLISS, BCPL, and extended ALGOL for Burroughs large systems. Forth also has applications as a systems language. In the 1980s, C became ubiquitous, aided by the growth of Unix. More recently C++ has seen some use, for instance a subset of it is used in the I/O Kit drivers of Mac OS X.
Read more about this topic: System Programming
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—Henry David Thoreau (1817–1862)