zike, a fan of antique oscilloscopes , used a Teensy 3.5 and a couple of probes to draw vector fonts on the display of an old analog oscilloscope.

The project was inspired by this vector display introduction by Trammel Hudson of NYCResistor using a Teensy 2.0 and an R-2R ladder DAC built with 32 resistors (16 per channel) .  This project makes use of the Teensy 3.5’s built-in DAC with no additional parts.  The fonts are Hershey vector fonts, originally designed to be rendered on early CRT displays.

Code for the project can be found on this forum thread.