I have a lisa1. It has not been used since 1987. I am looking for advice on how to start it working and the best way to sell it. From memory it was upgraded to an x(l???) by the addition of an emulator. I am in uk. I read that there are less than 100 in the world.
Back in the day, they booted from floppy disk. (Twiggy)
Finding those are at least as hard as finding an original Lisa. But I'm relatively sure someone who has one can make a bootable floppy for you to use for testing.
If you have the 3.5" disks (not so floppy) then you have a Max XL conversion of which there are many. Post a photo of yours?