Complex sentence: The whole unit was configurable through a custom operating system (latest version: 2.49)--while the system booted from a floppy, it flashes a "hands off" warning while it calibrates the keyboard.
Split into simpler sentences: The whole unit was configurable through a custom operating system (latest version: 2.49). While the system boots from floppy, it flashes a "hands off" warning while it calibrates the keyboard.