drum plotter
A type of pen plotter that draws on paper wrapped around a rotating drum. Used in computer-aided design and early graphics output.
Drum plotters were once widely used in CAD systems.
プロッタ is the general term for any plotter, while ドラム作図装置 specifically refers to a drum-type plotter.
Compound of ドラム (drum) + 作図 (drawing, drafting) + 装置 (device, apparatus). A direct calque of the English term 'drum plotter'.