Screenshot Feature - blackwine/Main_MiSTer GitHub Wiki
MiSTer has the ability to capture screenshots of a running core. This is useful for many things, including "saving" passwords.
Press Win + Print Screen (⌘ + F13)
The snapshots are captured directly from the core video output before it is scaled and any filters are applied -- i.e., it saves at the core's native video resolution.
Output files are stored in /media/fat/screenshots/