If you need to drive a big screen for a project, it’s fair to say your first thought isn’t going to be to use the ATtiny85.

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Additional circuitry required. One Diode (I use 1n4004) - pole/cathode at tx pin other at rx pin. 4k7 Ohm resistor between rx and 5V (3.3V also works). Same at the other microcontroller but you don't ...