The i486SX is a microprocessor developed by Intel and released in 1991. It is part of the Intel 486 family and is known for its 32-bit architecture. The i486SX was designed for personal computers and offered improved performance over its predecessor, the i386. Unlike the i486DX, it lacks a built-in math coprocessor, which means it relies on external chips for complex calculations. The i486SX typically operated at clock speeds ranging from 16 to 50 MHz. It supported various operating systems, including MS-DOS and early versions of Windows. This processor played a significant role in the evolution of computing, paving the way for more advanced processors in the Pentium series.