Plan 9 from Bell Labs’s /usr/web/sources/contrib/fgb/root/sys/src/cmd/4th/examples/bf/random.b
>>++>+<[ [>>]+>>+[ -[++++++[>+++++++>+<<-]>-.>[<------>-]++<<] <[>>[-]]>[>[-<<]+<[<+<]]+<< ]>> ] "Random" bit generator using the Rule 30 automaton. To get x bits you need 4x+4 cells. Daniel B. Cristofani ([email protected])