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Plasma Sun Sep 3 2006 at 2:26 pm
the problem is
Since the VGA doesn't have a light pen interface (only CGA and EGA), the scan beam x/y registers can't be read directly from software.
Most video cards that are VGA compatible have some additional registers which can be read from software, but I don't know of any that give access to the current x/y registers.
So I don't think it's possible to get the x/y beam position with software unless you use the method I described in my last post. But that will not work if you are using a multitasking OS, as you won't be able to get the timing accurate enough.
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