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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.
@Gordon
As @DrAzzy says, all drawing is done by Espruino (hence getColor) but is written direct to the screen.
As far as I know that module set up so it doesn't even need the MISO input. You could definitely add it though - shouldn't be too painful.
It sounds like you might want to make your own version that reads whole blocks anyway.
I'm not sure what you're trying to do, but if you want to save stuff for later use I'd consider creating an ArrayBuffer graphics and rendering it on Espruino in the first place. It'll be a lot faster.