Amiga 500: Booting From External Floppy

After the 1084S monitor, my Amiga 500 gets an external Gotek USB Floppy Drive emulator. To be able to boot from it, we install a DF0 switcher. Many demos and games on the Amiga can only be booted from the first floppy drive, DF0. The external drive is called DF1. With the switcher we can toggle the external drive to be either DF0 or DF1.