[Coco] Light pen stuff was:Re: Software testing for FDC emulator

[gene heskett]

On Tuesday, April 26, 2011 02:09:34 PM Steve Bjork did opine:

> Last time I checked,  1/10 of a second is 100 milliseconds, not 10
> milliseconds.
> 
> This is how I get in trouble.  They misquoted me!

In this case, I was running on my electronics autopilot, one of those cases 
where my brain is running several sentences ahead of the fingers, and I 
miss-quoted you.  My apologies.

However, 10ms vs 100 ms still isn't long enough to reliably obtain the 
pixel being pointed at unless you are actually playing phase locked loop 
games, which are both cpu intensive, and the flashing of the screen pixels 
would be a dead giveaway for proper aim by the gamer, not good.

To play phased locked loop and continuously track it once it has been 
acquired would only need a 9 pixel pattern.  That could be done in 100 
milliseconds if the lcd itself was fast enough.  Some of the first ones 
weren't that fast.

> Steve (often misquoted) Bjork
> 
> On 4/26/2011 9:37 AM, gene heskett wrote:
> > To do the same thing on an lcd screen, one would have to blink one
> > pixel 2 or 3 times, then if the gun doesn't detect that, go on and
> > blink the next pixel until you finally get a response from the gun. 
> > One could I suppose accelerate the search by blinking 1/4th of the
> > screen at a time to detect which quadrant, then sub divide the block
> > detected into quarters, wash, rinse, repeat till you have the exact
> > pixel,  but I don't see how that could be done in Steve's quoted 10
> > milliseconds since one 60 frame cycle is 16.something milliseconds.
> 
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