30-year-old Pentium FDIV bug tracked down in the silicon — Ken Shirriff takes the microscope to Intel’s first-ever recall

Ken Shirriff, noted reverse engineer and processor historian, has identified the specific transistors, incorrectly laid, which caused the original Pentium to be recalled at a cost of $475 million. 

Ken Shirriff, noted reverse engineer and processor historian, has identified the specific transistors, incorrectly laid, which caused the original Pentium to be recalled at a cost of $475 million.