Amiga DF0: Floppy Drive Motherboard Terminator
[AMIFLPTRM]
Amiga DF0: Floppy Terminator - when connected to the internal floppy on the Amiga motherboard, this will supress the floppy interface to permit quicker booting from other drives when a DF0: drive is not available.
Don't Forget:

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Amiga 4000 IDE Terminator