Demonstrating a Heathkit ET-3400A Microprocessor trainer driving an HP 7475A pen plotter.
<a href="http://gc.org/rc2011ww/" target="_blank" rel="noopener noreferrer">http://gc.org/rc2011ww/</a>

Demonstrating a Heathkit ET-3400A Microprocessor trainer driving an HP 7475A pen plotter. http://gc.org/rc2011ww/

Demonstrating a Heathkit ET-3400A Microprocessor trainer driving an HP 7475A pen plotter.
<a href="http://gc.org/rc2011ww/" rel="noopener noreferrer">http://gc.org/rc2011ww/</a>

ET-3400A drives HP 7475A pen plotter

Various videos of my retrocomputing projects

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ET-3400A drives HP 7475A pen plotter

ET-3400A drives HP 7475A pen plotter