On Friday, July 24, 2020 at 11:36 AM, Paul Koning wrote: > > On Jul 24, 2020, at 2:28 PM, David Gesswein <d...@pdp8online.com> wrote: > > > > On Fri, Jul 24, 2020 at 06:12:17PM +0000, Paul Moore wrote: > >> Not helped by not knowing what KSR really means. > >> > > > > Keyboard send receive. A model 33 teletype without paper tape. > > ASR was the model with paper tape, Automatic send receive. > > > > DEC used teletype's that generated mark parity. From the manuals > > keyboards were available to generate other parity. A reasonable amount > > of old code for PDP-8's assumed mark parity. Later code ignores the upper > bit. > > > > I thought the high bit setting would be turned off if you used set tti > > 7b or 8b but never verified. > > 7b, yes. But that only helps with software that sets the top bit on output, > as > some old Unices do. It doesn't help with the problem Paul M raised, which is > software that insists on mark parity input. > > The right answer would be a tweak to the console emulation in SIMH pdp11. > I wonder if this was done for PDP8 and not PDP11 because it was known to > be needed on the one but people hadn't run into it for the other.
The console emulation in simh actually has functionality to present input data with different character sizes and/or parity. Leveraging this functionality is missing from the PDP11 console devices. I will fix this over the next day or so. - Mark _______________________________________________ Simh mailing list Simh@trailing-edge.com http://mailman.trailing-edge.com/mailman/listinfo/simh
