Hi,
I know the page said it hadnt been tested, but I loaded ult_intrvl.bas on my SD850 and used it with sucess. It worked like a charm (except you need to set number of shots to zero if you want to use the Endless feature).
However, I could not turn iit off. Everytime I loaded (manually) CHDK, the script would start up again and I could not access the menu via the FUNC. SET button. IT was as if the camera was locked.
NOTE - When I used the script, my battery died and I replaced it to continue wha I was working on. So I dont know if this is a bug or whether I may have corrupted CHDK or the Script file when the battery died on my camera.
(Obviously I solved the problem with a fresh copy of CHDK).
Im just wondering if anyone else has had the same problem, or whether the problem is at my end with my lack of understanding regarding how to deactive scripts (however, remembering that I could not access the CHDK menu).