Editing Enigma machine (section)

=== Accessories ===
[[File:Enigma-printer-2.jpg|thumb|The ''Schreibmax'' was a printing unit which could be attached to the Enigma, removing the need for laboriously writing down the letters indicated on the light panel.]]
Other features made various Enigma machines more secure or more convenient.<ref>{{cite web |last=Reuvers |first=Paul |title=Enigma accessories |year=2008 |url=http://www.jproc.ca/crypto/enigma_acc.html |access-date=22 July 2010}}</ref>

==== ''Schreibmax'' ====
Some M4 Enigmas used the ''Schreibmax'', a small [[Printer (computing)|printer]] that could print the 26 letters on a narrow paper ribbon. This eliminated the need for a second operator to read the lamps and transcribe the letters. The ''Schreibmax'' was placed on top of the Enigma machine and was connected to the lamp panel. To install the printer, the lamp cover and light bulbs had to be removed. It improved both convenience and operational security; the printer could be installed remotely such that the signal officer operating the machine no longer had to see the decrypted [[plaintext]].

==== ''Fernlesegerät'' ====
Another accessory was the remote lamp panel ''Fernlesegerät''. For machines equipped with the extra panel, the wooden case of the Enigma was wider and could store the extra panel. A lamp panel version could be connected afterwards, but that required, as with the ''Schreibmax'', that the lamp panel and light bulbs be removed.<ref name="Rijmenants" /> The remote panel made it possible for a person to read the decrypted plaintext without the operator seeing it.

==== ''Uhr'' ====
[[File:Enigma-uhr-box.jpg|right|thumb|upright|The Enigma Uhr attachment]]
In 1944, the ''Luftwaffe'' introduced a plugboard switch, called the ''Uhr'' (clock), a small box containing a switch with 40 positions. It replaced the standard plugs. After connecting the plugs, as determined in the daily key sheet, the operator turned the switch into one of the 40 positions, each producing a different combination of plug wiring. Most of these plug connections were, unlike the default plugs, not pair-wise.<ref name="Rijmenants" /> In one switch position, the ''Uhr'' did not swap letters, but simply emulated the 13 stecker wires with plugs.