A German modder named Dietmar successfully managed to patch Windows XP to run on a 1989 Intel 486 processor clocked at 90MHz, a significant challenge given that the operating system was originally designed to run on a Pentium processor with a clock speed of 233MHz. Despite the impressive technical accomplishment, the exercise may seem pointless given the age of the hardware involved. This feat highlights the ingenuity and dedication of computer enthusiasts, pushing the boundaries of what is possible in the world of computing. While this particular achievement may not have practical applications, it is a testament to the creativity and perseverance of those who seek to explore the capabilities of obsolete technology.
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https://www.tweaktown.com/news/98461/late-review-windows-xp-runs-just-fine-on-an-intel-486-pc-from-1989-when-it-really-shouldnt/index.html