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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@JumJum
Take a short look to this http://www.espruino.com/modules/PCD8544.js and you will see, a graphics object is returned.
Goto references for graphical object http://www.espruino.com/Reference#Graphics there is a description for changing fontsize http://www.espruino.com/Reference#l_Graphics_setFontVector
Hope this helps
Juergen