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Intel launched the Pentium processor in 1993. Unfortunately, dividing sometimes gave a slightly wrong answer, the famous FDIV bug. Replacing the faulty chips cost Intel $475 million. I reverse-engineered the circuitry and can explain the bug. 1/9

XPU.news

@xpu.news

13 Dec 2024

Now find the bug in the rug. 😜

Ken Shirriff

@righto.com

Ha ha. It turns out that the rug doesn't have the bug, since the rug shows the P54C version of the Pentium. This is the higher-frequency version of the original Pentium (P5). The FDIV bug had been fixed by this point. But you can see in the rug exactly where the FDIV bug was.

13/12/24, 9:42 pm1 repost22 likes

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