When it came to games I had written I had relied on promises that Microsoft had made that dos virtualization would be quite seamless. My game used a pseudo ret

When it came to games I had written I had relied on promises that Microsoft had made that dos virtualization would be quite seamless. My game used a pseudo retrace interrupt by carefully calibrating the timer every frame to generate an interrupt just before the screen retrace and adjusting the timer to compensate for drift. This did not work in Windows95. OS/2 did it almost perfectly (it missed the occasional frame but not enough to matter)