jrdeahl wrote:I have a portable battery, like you would use to recharge a cell phone. it is a lithium 20,000 with USB output. I also have a ATN X-Sight with HDMI Micro cable output of video.
I am wondering if this Raspberry PI unit will work, by displaying video from the ATN X-Sight and using the USB power mentioned. Will it work as a basic unit without additional memory card or config.sys?
The display you linked to is not what most people will assume you mean when you say "Raspberry Pi 7-inch Display". There is a very specific 7" display
made for the Raspberry Pi that will work only
with the Pi (and would have zero chance of working with your rifle scope
The display you link to is essentially the guts of a garden variety 7" HDMI/VGA LCD monitor but with no case. It has absolutely nothing to do with the Raspberry Pi, other than that the seller is suggesting that one could use it to display output from a Raspberry Pi (which is true). But I would think that for a rifle scope that you'll presumably be using outdoors, you'd want something built into a ruggedized/weatherproof case. Regardless, no Raspberry Pi would be involved in the chain between the scope and the display, so no memory card or changes to config.txt would be necessary.
As to whether the monitor you linked will work with your scope, we can only offer guesses. Probably yes, with the proper microHDMI-to-HDMI cable. But that question could be better answered by the seller of the display, than on this Raspberry Pi forum.