| 1. | Have a chart instructing him in that day's plugboard settings.
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| 2. | The plugboard contributed more cryptographic strength than an extra rotor.
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| 3. | Initially, the plugboard only swapped six pairs of letters.
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| 4. | Keys were easily changed by changing the rotor disks and the plugboard wires.
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| 5. | The plugboard allowed less specialized conditions to be imposed.
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| 6. | Line formatting was programmed by inserting wire jumpers into a plugboard control panel.
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| 7. | Each letter on the plugboard had two jacks.
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| 8. | They also did not know the plugboard settings.
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| 9. | Other plugboards controlled card reading and punching, the printer and the console typewriter.
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| 10. | By that time, the commercial Enigma had been extended to use a plugboard.
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