There are various modern disk interfaces that can be plugged in as alternatives. BMOW, also has a floppy emulator you plug into the floppy controller which emu

There are various modern disk interfaces that can be plugged in as alternatives. BMOW, also has a floppy emulator you plug into the floppy controller which emulates the drive+disk using SD cards. https://www.bigmessowires.com/floppy-emu/ https://www.bigmessowires.com/floppy-emu/ I have a fairly old CFFA https://dreher.net/?s=projects/CFforAppleII&c=projects/CFforAppleII/main.php https://dreher.net/?s=projects/CFforAppleII&c=projects/CFfor... as well, its a pretty solid HD emulator as well. There shouldn't be a problem using older floppy disks if you can get ones that actually are for apple ][s and C64's rather than the later higher density ones used by PCs/etc.