Comment by K0balt

Ok so, turns out there are a lot of MCUs like this, including a riscV triple core lockstep with ECC lol. No super cheap ones, but microchip makes the AVR-SD which leverages a pair of their AVR8 cores in lockstep with ECC flash and RAM. It’s ~$1, so I think I’ll pick that as my next toy project to play with. Turns out, Simpsons already did it.