Portsdown 4 File Menu
The Portsdown 4 File Menu gives access to some diagnostic tools, that would normally require a PC, from the touchscreen.
File Explorer
List Network Raspberry Pis
List Network Devices
List USB Devices
This runs the Linux command lsusb and displays the output 10 lines to a page. It is useful for identifying the exact type of "EasyCap" devices. The original ones display a line including the name "Fushicai".