TheHP 7470 was a small low-cost desktop penplotter introduced byHewlett-Packard'sSan Diego division in 1982.[1] It was the first small-format plot that moved the paper, rather than the pens.[2]It used a revolutionary "grit wheel" design which moved the paper held in place by a wheel with embedded grit and a pinch roller.
The HP 7470 had two pens, one on either side and plotted on ANSI A (8.5 x 11 inch) or A4-sized paper.[3] It was much less expensive than the previous flatbed design. It was very heavy but had 4 pens. The HP 7475 used a rotating carousel with six pens. That plotter was used in greeting card kiosks. This design was also scaled up for very large pen plotters. These were driven by theHP-GL plotter language which usedASCII commands such as PA 300, 4500;PD;. The plotter had three electrical interfaces:HP-IB,RS-232, andHP-IL for HP handheld calculators.
Pen plotters became obsolete with the adoption ofink-jet printers, and processors fast enough torasterize complex images.Houston Instrument and other manufacturers would follow with similar plotters.
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