[rbsmith]

| CDC's MODIFY and Cray's clone UPDATE, were kind of like SCCS

Do you have references? I've heard of these but haven't come across details after much creative searching since they are common words.

[pmcjones]

See http://www.bitsavers.org/pdf/cdc/cyber/software/ .

[rbsmith]

Thank you! A peek into the (as far as I know) into root node of source control history.

[luckydude]

I've heard that too. It comes from card readers somehow.