I just used a DOS 2.5 disk with the XEP80 driver renamed to AUTORUN.SYS, attached are the 2 images I made. I put them on a SIDE3 cart on a standard 800XL and booted from the loader, will put the .ATR on my S-Drive and boot that way too.   EDIT: I just put it on my S-Drive, but booted into SDX on the SIDE3, at the command line I typed D1:ALTXEP80.SYS and I now have the XEP80 screen on my monitor, so I'm using the driver off the Altirra Additions disk.   Sti
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