If we look at the original concept of the original question, the answers are limited.
If you have an Amiga 500 with no boot floppy, how do you get a boot floppy?
There's only 3 ways I'm aware of (mentioned here above, I'm just summarizing):
1: Find someone with an Amiga to make you a copy and give/send it to you.
2: Use a catweasel controller in a PC and write an image.
3: Use a kryoflux USB attached to a PC and write an image.
You can't use serial or network to transfer the first floppy to the Amiga.
Once you have a boot floppy, then you can use serial to transfer whatever you need, but you need that first boot floppy.
That's one of the things I like about ADTPro and the Apple II computers. All you need is a PC and an Apple II and you can create the first boot floppy. You don't even need a serial port, you can bootstrap with audio. ;-)
But the Amiga needs that first boot floppy..
Hey, I just thought of another way.
4: Use a Floppy emulator. Then you either don't need a floppy (just use images in the emulator) or write one to an external drive..
So, those are the only 4 ways I can think of to get that first boot floppy.
desiv
(OK, technically, you could add a hard drive (for the A500, it'd have to be a sidecar SCSI unless you have a custom ROM) and you could write a bootable HD image to the SCSI disk, boot off of that and create the floppy, but that's getting pretty extreme..) ;-)