Re: PC
We had B21s, B25s and, I believe, one B28 and one B38 before PCs started encroaching on the CTOS empire. Also, the CTOS "command line" was a masterpiece in user friendliness compared to any other command line system I've ever come across either before or since.
There's a whole bunch of pictures/docs here for anyone interested: http://bitsavers.org/pdf/convergent/ngen/
Oh, and please write your On Call - I'd love to hear about it and I'm sure others would as well!