Atmel makes ATtiny processors with no SRAM.
Since we are pressing on without the pleasure of the company of the OP, I was reading yesterday about how one of the first gaming consoles (or devices anyway) only had 128 bytes of RAM, because it was so expensive. It might have been Pong. So each frame refresh, the entire playing field had to be generated from scratch, because it couldn't be stored in RAM.
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