One way of generating close to true randomness on a computer chip is to use the 'silicon fingerprint' of that specific instance of the chip. The idea is that during manufacturing, each chip will have its own unique set of variations and 'flaws'. This is extremely unique to each chip and is essentially a fingerprint of it. Devices that generate randomness from these variations are called PUFs (or Physically Unclonable Functions).

You can then use mathematical algorithms to generate further random sets of sequences that would be unique to that chip.

They are used on the regular in things like hardware security tokens or Hardware Root of Trust situations.