5 mo ago
8 viewsDemonstrating a Heathkit ET-3400A Microprocessor trainer driving an HP 7475A pen plotter.
http://gc.org/rc2011ww/
ET-3400A drives HP 7475A pen plotter
5 mo ago8 viewsLoading comments...
5 mo ago8 views5 mo ago8 viewsDemonstrating a Heathkit ET-3400A Microprocessor trainer driving an HP 7475A pen plotter.
http://gc.org/rc2011ww/
