Sounds like Tektronix may have OEM'd this printer
from DEC.
It appears to have a serial RS-232 interface that is a separate
circuit board that is 'added on' to some kind of parallel
interface.
Not surprising, a several pieces of Tek gear had DEC stuff inside in the
80's. Somewhere I've got some doc's of some kind talking about a system of
theirs that had a MicroVAX inside, IIRC.
Zane
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