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IBM's published Bios[ Parent ] (none / 0) (#20)
by byelen on Mon Apr 14, 2008 at 07:20:27 AM PDT

IBM published their pc/xt/at bios in order to make it MORE difficult for reverse engineering. By having the code published, a company reverse engineering the bios would have to prove that their engineers NEVER saw the published code. Compaq had two teams of engineers reversing the bios. Team one (working with the hardware) created a set of specs for the bios calls and actions. Team two took these specs and wrote a "new" bios. Neither team had contact with one another.

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