Really interesting that it was a 486 bug, given the provenance listed in the article. Windows 3.0 was, indeed, released after the 80486 was. I am not sure why

Really interesting that it was a 486 bug, given the provenance listed in the article. Windows 3.0 was, indeed, released after the 80486 was. I am not sure why the reset busy code was repeated 3 times, I assume the bit must have been somewhat sticky. "If an unmasked exception occurs when the numeric exception bit in CR0 is clear and the IGNNE# pin is active, the performance of the FPU will be retarded as long as the exception remains pending." https://www.cs.earlham.edu/~dusko/cs63/prepentium.html https://www.cs.earlham.edu/~dusko/cs63/prepentium.html I wonder if that has anything to do with it all.