[Coco] Diecom light gun adapter

[Zippster]

I’ll take a look at this after I get through the CoCo3FPGA analog boards.
I think I have all the info needed.  I kind want one myself…  :)

- Ed


> On Jun 16, 2016, at 1:30 PM, Michael Brant <brant.michael.l at gmail.com> wrote:
> 
> Ed,
> I wonder how many of us with CRTs would be interested in a Diecom
> reproduction.  I would probably be interested in 2 of them.  I have a CM-8
> and a CRT VGA monitor.
> 
> On Thu, Jun 16, 2016 at 10:22 AM, Zippster <zippster278 at gmail.com> wrote:
> 
>> Maybe, it’s worth a try if someone has a light gun and an led display.
>> 
>> - Ed
>> 
>> 
>>> On Jun 16, 2016, at 9:01 AM, Barry Nelson <
>> barry.nelson at amobiledevice.com> wrote:
>>> 
>>> What about an LED display? They have much lower latency.
>>> 
>>>> Zippster zippster278 at gmail.com
>>>> Thu Jun 16 09:02:23 EDT 2016
>>>> Yes, from what I was reading, there are two different systems using this
>>>> general type of light gun.
>>>> 
>>>> One calculates positioning information by drawing an entire field in
>> white,
>>>> using the timing of the display scan, and when light is seen by the gun
>> to
>>>> determine which part of the screen is being pointed at.  The
>> compatibility
>>>> issue here is that LCDs don’t scan left to right and top to bottom like
>> a CRT,
>>>> as well as latency.
>>>> 
>>>> The other, which seems to be more common, draws the potential targets
>> in a field
>>>> when the trigger is pressed (in white), and if the gun sees light, it
>> was pointed at the
>>>> target.  The issue here just being latency.
>>>> 
>>>> The timing is of course very tight and has to be accurate in this type
>> of system,
>>>> so the latency of an LCD display breaks it.
>>>> 
>>>> Possibly the portions of software dealing with the timing could be
>> rewritten to
>>>> compensate for the delay, presuming a similar delay between LCD screens.
>>>> 
>>>> Otherwise a different system using IR sensors for positioning like a
>> modern console
>>>> would be the way to go, but then there’d be nothing written for it.
>>>> 
>>>> - Ed
>>> 
>>> 
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