This is the left side view of the Calcomp 563 incremental plotter with the cover removed. The two big wheels are part of the mechanism that allows the pen left-right steps per inch to be adjusted to align the paper with the plotter motion.
Feel free to contact me, David Gesswein firstname.lastname@example.org
with any questions, comments on the web site, or if you have related equipment,
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related, computers, peripherals used with them, DEC or third party, or