Subject: Re: [stella] Light gun/pen From: Nick S Bensema <nickb@xxxxxxxxxxxx> Date: Tue, 30 Sep 1997 12:11:41 -0700 (MST) |
> > >On Tue, 30 Sep 1997, Eckhard Stolberg wrote: >> I don't have a lightgun, but I think it is the same as a paddle with a >> photo sensor instead of a potentiometer. You would read it the same way >> and it would take longer to recharge depending on how much light reaches >> the sensor. Since the amount of light, that reaches the sensor, depends > >I think it's more than that with Atari systems at least, otherwise light >pens would not work as paint programs or pointing devices. Such a system >as you describe is far too crude for anything but the early pong systems >and you wouldn't be able to differentiate between hitting one object or >another, etc.... > >The Atari 8-bit has discrete hardware registers for reading a light pen >(light pens work better than guns for obvious reasons). It does a fairly >rough job on the horizontal ;) The important thing isn't whether or not a >light gun detects light (which will just give you on or off), it is >finding a way for the computer to determine the X and Y coordinates of >where the beam is hitting the TV, and THEN cross referencing this with >your objects. Using a black background and a highly-contrasted TV, and assuring either only one object per scanline-frame (like ancient Pong machines), or a 1/30-second "test cycle" that would flash the objects that could have been hit and see which one registers on the light gun. I think the NES did something similar; ever notice how the screen flashes on Duck Hunt whenever you shoot the gun? >Other than Atari systems like the XEGS, 7800, or the unused capability in >the 5200, the only other systems I know of that supported a light pen/gun >were the Astrocade (at least I know it had a port for it) and the Vectrex >(which probably operated under principles similar to the earliest 1960s >style light pens which were originally used with oscilliscope monitors). And the NES if we want to go there. :-) But using Duck Hunt as evidence, its light gun support might not have been the greatest. -- Archives updated once/day at http://www.biglist.com/lists/stella/archives/ Unsubscribing and other info at http://www.biglist.com/lists/stella/stella.html
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