jshorstman / Analog-XY-Plotter-Output-to-HPGL-Translator

This device translates X-Y analog plotter output into a stream of HP-GL commands to a file. (Hewlett-Packard Graphics Language, http://en.wikipedia.org/wiki/HP-GL). You can replace your mechanical pen plotter with a Windows-based software plotter, such as SPLOT (http://www.swplot.com/splot.htm).

Analog-XY-Plotter-Output-to-HPGL-Translator

The Translator will continually sample the X and Y analog voltages from an oscilloscope's pen plotter output port, digitize them, and package the values into a series of plain text HP-GL plotter commands, which are output via a USB port to a file on a PC. The HP-GL file can be processed into a display image by any commonly available plotter emulator application, such as SPLOT (http://www.swplot.com/splot.htm).
Read all about it in the 'Documentation/Translator Description.docx' document.
See the demo video on YouTube; https://youtu.be/DhNy6BU84X4