About This File
In you emu dir, create a subdir named bios and place the 5200.rom there extracted.
When you first start kat5200, you will be presented with a Wizard. Set the bios folder you created as your "Atari 8-bit Image Directory" and leave Scan for BIOS? checked.
While in the wizard, check the Fullscreen box to enable it and set Video Zoom to 2x.
CLI is supported but doesn't seem to work. So for now, set your video options from the GUI.
Settings are stored in the kat5200.db3 file.
Roms must be extracted, zip is not supported