The HP 7470 was a small low-cost desktop pen plotter introduced by Hewlett-Packard's San Diego division in 1982.
The HP 7470 had two pens, one on either side and plotted on ANSI A (8.5 x 11 inch) or A4-sized paper.
These were driven by the HP-GL plotter language which used ASCII commands such as PA 300, 4500;PD;.
The plotter had three electrical interfaces: HP-IB, RS-232, and HP-IL for HP handheld calculators.
Pen plotters became obsolete with the adoption of ink-jet printers, and processors fast enough to rasterize complex images.