even the AS/400 didn’t require power down. this is actually so ancient it’s hard to find docs. here’s something from 1976. (the report is 1990 but the hardware

even the AS/400 didn’t require power down. this is actually so ancient it’s hard to find docs. here’s something from 1976. (the report is 1990 but the hardwares dates to ‘76). https://www.hpl.hp.com/techreports/tandem/TR-90.5.pdf https://www.hpl.hp.com/techreports/tandem/TR-90.5.pdf