A .580 file stores the full 64 KB RAM image and PC. Other registers, flags, HLT, interrupt state, and devices are not stored; they take initial values after opening.
Ctrl+O opens .580. Ctrl+S saves to the current path or asks for one on first save. Ctrl+Shift+S always saves under a new name.
Ctrl+N starts an empty session by zeroing RAM and resetting the processor. Unsaved changes require confirmation before open, new, or close.
Use TXT/XLSX import and export to exchange selected registers, flags, and RAM ranges.