Who were the worst of the worst?

On 2/14/2013 3:16 PM, Jason McBrien wrote: You contradict yourself. You say the PCjr was not a clone, and then you complain that it was less PC-5150 compatible than early clones. Note that the PCjr runs most later software just fine, assuming you have enough memory. I think what broke the Jr has more to do with people coding to specific BIOS locations, which broke any "near" clone. In 1983 when the PCjr was introduced that practice was rampant. By 1985 there were enough other "near clones" with some unique hardware out there so that the practice would break other machines too. Case in point: Nobody complains about the 5140 Convertible being not compatible enough, yet it has a lot of the same general problems as the PCjr. (Using the NMI for keyboard handling, mapping the keyboard scan codes, etc.) Mike