4 ms·
No, and there was no (easy) way to detect the vertical retrace. For a lot more on that topic have a look at the Apple II mouse card, they needed to synchronise
by jdswain 2y ago
No, and there was no (easy) way to detect the vertical retrace. For a lot more on that topic have a look at the Apple II mouse card, they needed to synchronise with the video and did work out a software based way of doing it, but the final product added hardware to make it possible.