I though Duck hunt was only interested in hit or miss, so it only flashed a block over the target area. If the gun saw the flash at the time it was supposed to be displayed, you had a hit. It didn't bother with the rest of the screen. You could usually see the block around the duck flash as 30fps isn't really that fast.
----- Original Message ----- > The "quickly flying light dot" is how the picture was drawn on a CRT, > so it > didn't have to do anything special. The light pen simply reported to > the video card "I saw the dot", and the board would then store > somewhere the > exact x/y position that it was drawing when the pen fired. This is how > the gun for the NES worked, as well as various other such instruments > for other > computers. I remember the C64 having such, also. > > It probably wasn't a great idea to stand that close to a CRT for > extended periods of time. > > Michael > > > On Mon, Sep 9, 2013 at 3:00 PM, Jack Coats <[email protected]> wrote: > > > The other day I ran into my doc's about CGA displays, including the > > lightpen input. The light pen was a photo transistor and a switch > > that signaled the CGA board the light pen was pressing on the glass > > screen. The CGA display actually did the scanning (with a quickly > > flying 'light dot' to find the pen position) and reported it back to > > the computer through the CGA display card. > > > > Now back to your daily dose of > > non-bone-kives-and-bear-skin-technology. > > > > -- > > -- You received this message because you are subscribed to the > > Google Groups > > "NLUG" group. > > To post to this group, send email to [email protected] > > To unsubscribe from this group, send email to > > [email protected] For more options, visit this > > group at > > http://groups.google.com/group/nlug-talk?hl=en > > > > --- You received this message because you are subscribed to the > > Google Groups > > "NLUG" group. > > To unsubscribe from this group and stop receiving emails from it, > > send an > > email to [email protected]. > > For more options, visit https://groups.google.com/groups/opt_out. > > > > > > -- Michael Darrin Chaney, Sr. > [email protected] > http://www.michaelchaney.com/ > > -- > -- You received this message because you are subscribed to the Google > Groups "NLUG" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] For more options, visit this > group at http://groups.google.com/group/nlug-talk?hl=en > > --- You received this message because you are subscribed to the Google > Groups "NLUG" group. > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. -- Steven Critchfield [email protected] -- -- You received this message because you are subscribed to the Google Groups "NLUG" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nlug-talk?hl=en --- You received this message because you are subscribed to the Google Groups "NLUG" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
