I have no idea what George Dyson means when he says Turing had a 1D memory and Von Neumann changed it to a 2D memory. I consider both to be equally 1D with Turi

I have no idea what George Dyson means when he says Turing had a 1D memory and Von Neumann changed it to a 2D memory. I consider both to be equally 1D with Turing having sequential access and Von Neumann random access. What I call 2D memory is a segmented addressing scheme. The implementation in the form of Williams Tubes (used in Von Neumann's Princeton machine) is indeed 2D, as is a modern DRAM or SRAM. But it is wrapped up in a 1D interface to the rest of the computer (a little less obviously so with RAS and CAS in DRAMs).