Hi, unfortunately I do not have JiffyDOS or DolphinDOS so I have no way of testing it on these. Sorry.
Viewing post in Nixy The Glade Sprite (C64) comments
Alright - but perhaps you can use this one to test with? (DolphinDOS 2)
http://csdb.dk/getinternalfile.php/175673/dd2_kernal_rom.bin