There is another factor complicating this history lesson. The most extant machine that was OS/2 capable at the time of its launch was the IBM PC/AT. Most of the PC/AT models shipped with mask C of the 80286 processor. There was a flaw in the C mask chip that caused the CX register to be trashed on a GPF. That meant for OS/2 to take advantage of this hardware feature would have required a processor upgrade (they were socketed, PGA) for all these machines. Still, how hard would it have been to include a chip in the package? -dq