These printers look like they may have been hooked up with a MarkNet
device which often can be a lan device with maybe a parallel and a serial
port on it of which both can be used (much as you've shown). Too bad of
the last two people here who hooked up these old devices, one passed away
way too early in life (<expletive deleted> cancer) and the other was given
the choice to pursue opportunities elsewhere.
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