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The paper rolls were {{convert|120|ft|m}} long. A metal bar above the take-up reel allowed a finished plot to be torn off and removed. The drum would then be advanced using the manual controls and the fresh paper end taped to the take-up reel. The standard pen was a [[ball-point pen|ball-point]], but liquid ink pens were available, and typically used for higher quality plots intended for publication. Other paper stock could be taped to the drum if desired. A chart drive switch was provided to turn off the motorized paper supply and take-up reels for this purpose.
A Calcomp plotter attached to an [[IBM 1401]] was used to develop [[Bresenham's line algorithm]] in 1962.<ref name = DADS>Paul E. Black. ''Dictionary of Algorithms and Data Structures,'' [[National Institute of Standards and Technology|NIST]]. https://xlinux.nist.gov/dads/HTML/bresenham.html</ref>
==External links==
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