By default, any computer you buy from Apple is not case sensitive.
My Apple //c was case sensitive, in both DOS and ProDOS file systems.
Actually come to think of it, it wasn't exactly case sensitive OR insensitive... it was case
preferred.
SAVE X
SAVE x
(now you have two files, X and x)
DELETE X or DELETE x will delete the appropriate file
however,
DELETE X
DELETE X
will remove both. the second one does not find X so it falls back to x.
that's an interesting compromise don't you think?