> From: Johnny Billquist <b...@softjar.se> > Date: Sat, 25 Jul 2020 00:58:08 +0200
> I would have to disagree with that. All older PDP-8 software is > definitely using MARK parity, not EVEN. Both on input and output. > (Sortof annoying if you aren't expecting it.) > The ASR33, as configured by DEC, was normally also set up with MARK > parity, which is probably the reason all software expected it. > Actually, older PDP-11 software is also expecting MARK parity. Lots of > the older diagnostics, for example. > I wouldn't know about older PDP-10 software, but it would be a little > surprising if they did things differently than PDP-8 and PDP-11. Hi, Johnny, On the PDP-10, the rule was "Be strict in what you send, and generous in what you accept." The standard was to send 7E1, and anything which could be made 7-bit on input was good (so 8N1 was popular). Rich Rich Alderson ex LCM+L s...@alderson.users.panix.com _______________________________________________ Simh mailing list Simh@trailing-edge.com http://mailman.trailing-edge.com/mailman/listinfo/simh