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This is an sale for an Atari 800XL System that has been modified with a system monitoring/debugging add-on called \"Omnimon!\"
I\'ve take it apart completely and cleaned it up.
It adds an add-on board with a switch on the back that turns Omnimon! on and off. When Omnimon! is off, the background of the BASIC screen is a light blue and when it is on it turns dark blue. I\'ve included screenshots of that with this listing.
I know very little about this add-on, unfortunately. There is some useful information about it online however:
Note to buyers outside of North America: If you choose \"International Parcel - Surface\", it could take over two months for the item to come to you and does not come with tracking. Please only choose this option if you\'re okay with waiting at least 60 days.
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Documentation