[Proud_texan]

I don't think so. I looked at it pretty close and eventually the code was published in the IBM PC Tech Ref manual and it looked to be the part that IBM contributed.

On the other hand IBM got the operating system (DOS) from MS who had purchased the marketing rights from Seattle Computer Products.

[PJ-Comix]

I looked at it pretty close and eventually the code was published in the IBM PC Tech Ref manual and it looked to be the part that IBM contributed.

So why would they need to "reverse engineer" it in the show?