This has always meant needing a PC ... Serial Monitor! [ARPix] built this fully functional serial monitor based on an Atmega328 and a 102 x 64 LCD display. While it doesn’t have a keyboard port ...

The Arduino comes pre-programmed with the Firmata sketch for PC Operation, which provides an interface to the Arduino hardware via a serial port for controlling the GPIO and peripherals.

After some research, it was determined that it would be relatively simple to have an Arduino convert incoming ... bang graphical data out over the serial port, as the printer cannot keep up ...