Also, Dijkstra was at the “Mathematisch Centrum” when the ARRA was being designed, and wrote agoutis design and software (https://www.cs.utexas.edu/users/EWD/in

Also, Dijkstra was at the “Mathematisch Centrum” when the ARRA was being designed, and wrote agoutis design and software (https://www.cs.utexas.edu/users/EWD/indexMCreps.html https://www.cs.utexas.edu/users/EWD/indexMCreps.html) It was a 30-bit machine with 1,024 words and 2 registers, with 2 instructions per word.