Obsolescence[edit]The AMD Am5x86, up to 133 MHz, and Cyrix Cx5x86, up to 120 MHz, were the last 486 processors that were often used in late generation 486 motherboards with PCI slots and 72-pin SIMMs that are designed to be able to run Windows 95, and also often used as upgrades for older 486 motherboards. While the Cyrix Cx5x86 faded quite quickly when the Cyrix 6x86 took over, the AMD Am5x86 was important during the time when the AMD K5 was delayed.In the general purpose desktop computer role, 486-based machines remained in use into the early-2000s, especially as Windows 95, Windows 98, and Windows NT 4.0 were the latest Microsoft operating systems to officially support installation on a 486-based system.[10][11] However, as Windows 95/98 and Windows NT 4.0 were eventually overtaken by newer operating systems, 486 systems likewise fell out of use. Still, a number of 486 machines have remained in use today, mostly for backward compatibility with older programs (most notably games), especially since many of them have problems running on newer operating systems. However, DOSBox is also available for current operating systems and provides emulation of the 486 instruction set, as well as full compatibility with most DOS-based programs.[12]Although the 486 was eventually overtaken by the Pentium for personal computer applications, Intel had continued production for use in embedded systems. In May 2006 Intel announced that production of the 80486 would stop at the end of September 2007.[13]
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