It's not a circle. It's supposed to be a graphic representation of a floppy disc. It looks a lot like this, but it is white on black instead of black on white as in that picture. When it occurs, it seems to always happen following a scene change, like going from outside the boarding house to inside the house, or going from outside the boarding house to the cable car area. During those scene changes there is always a "Loading..." icon displayed in the lower right corner of the screen. If the save occurs, the disc icon is displayed immediately following the "Loading..." icon in the same screen location.

An odd choice for a graphic!

The floppy disc, in all of its obsoleteness, is still used extensively as a save icon. Just Google "save icon" and see what you get. That's how I found the picture that I used.

In the Admin area of our American Legion website which I administer, the save icon is a floppy disc there too! It actually makes some sense, ancient as it is.

Yeah !! Now I am experiencing the "floppy disk" save notification. So enjoying myself even more !! Thank you, Uncle Reg

Yay, indeed! Have fun, Mad!

Great. I'm glad it's working for you.

And it's a real Adventure game !!