@Godfather-
Yep... Kronos is correct.
the program sys:c/setpatch (which should be in your standard workbench 1.3 startup-sequence) will patch what it needs to run on a 1.3 rom.
You'll get Shell available (command history, primitive pattern matching (via #? not *, though)) Seems like there were also a few fairly critical bug patches, and possibly the first appearance of the FastFileSystem. (it's in 1.3 for sure... Just don't remember if it was in 1.2 or not)
If you have a hard drive controller for your Amiga, though, you'll still have to leave it in 1.2 autoboot (or manual boot, if it doesn't have that option) as that *IS* dependent on the 1.3 rom.
