In this second installment of the Rise and Fall of the IBM PC series, we will be taking a look at the rise of the IBM Compatible clone market and how it seized control of the IBM PC standard away from IBM itself, relegating IBM to just another PC manufacturer. We cover events up to IBM's decision to release OS/2 and the PS/2 line of computers, which is where the next part will pick up. I would be remiss if I did not mention the enormous help that Jeff Duntemann (a man who went head to head with Bill Gates in programming and is an expert on legacy computing) was in helping me understand just what the BIOS did on legacy PCs and how it interacted with the OS and the hardware. He was kind enough to respond to not only answer my questions regarding the BIOS, but also gave me a massive amount of useful information, some of which will be appearing in future planned videos.