A year later, in April 1986 newer adverts included a note that a power input isn't required, which may refer to a new version, and which may mis-use the signal levels as supply voltages - if so, it may require some programming cautions (such like not to switch all signals to LOW level for longer periods), accordingly it may be incompatible with software from the older version.
Below are two photos, one showing a power-supply cable, one not showing one. Both have 34pin connectors, so both are probably printer-port-related hardware (although the photo with power cable is claimed to show a [[KDS Electronics Serial Interface|KDS Serial Interface]] with 50pin connector, which is obviously nonsense).
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