Comment Re:ARPAnet and IPSS (Score 1) 150
In the latter 80's I attended a lecture at UTSA (University of Texas San Antonio) where ARPAnet was discussed. I remember a story of a RAM failure in an IMP (interface message processor) which caused a particular block of memory to fail and read back all zeroes. Because the computer it was running on didn't include odd parity, everything read back as zeroes, including the parity bit, and so the CPU didn't know of the failure. It just so happened that the routing table fell within this range of RAM, and so "this" IMP became the next hop to every destination. This, of course, made it a "black hole" router. All packets that came in were discarded because the routing algorithm saw "this" node as the final hop. This led to changing to odd parity (IIRC).
For those who would instantly debunk this story, please note that ECC was not in use in those days, whether or not it had been invented. Even big IBM iron only used single bit error detection, with no correction.