Light Pens ...

From: Michael Brutman <mbbrutman_at_chartermi.net>
Date: Sun Jul 15 20:07:13 2001

Fred,

Where was I during VCF? Probably tiling my bathroom. I'm relatively
new to the list, so I haven't done any VCFs yet. The one in two
weeks is too far away - I'm in Minnesota.

Tony always elaborates. :-) That's a good thing.


Tony:

I hadn't realized that on a PC w/ CGA that the light pen was getting
help from the CRT controller. That explains how a relatively simple
device can report positioning information - it doesn't, the video
card is doing it.

So here's a trick question .. what happens when a person holds
a lightpen to a dark section of the screen. Is the lightpen
completely blind unless come pixel is lit up?



Thanks,
Mike
Received on Sun Jul 15 2001 - 20:07:13 BST

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