On Friday, July 24, 2020 at 5:42 PM, David Gesswein wrote:
> On Sat, Jul 25, 2020 at 01:22:38AM +0200, Johnny Billquist wrote:
> > >
> > > I thought the high bit setting would be turned off if you used set
> > > tti 7b or 8b but never verified.
> >
> > Which obviously won't help if the software running inside simh then
> > expects MARK parity...
> >
> Correct. That was for software that doesn't want mark parity.
>
> Probably should had quoted this from the posting.
>
> > So basically pdp8 is always doing KSR. I assume that I don’t want that
> > for pdp11.
> >
>
> pdp8_doc.doc 2.4.3 KL8E Terminal Input says it will not force mark parity if
> you specify 7P, 7B, or 8B.
>
> The rest of the context.
>
> I am running it in the windows console.
>
> I can see that setting TTU_KSR on the mode flags passed to sim_tt_impcvt
> will do the job. The pdp-8 console hard code this bit on
>
> else uptr->buf = sim_tt_inpcvt (c, TT_GET_MODE (uptr->flags) | TTUF_KSR);
>
> the is also a KSR mode switch
>
> MTAB tti_mod[] = {
> { TT_MODE, TT_MODE_KSR, "KSR", "KSR", &tty_set_mode },
>
> But this only forces UC (sim_console.h)
>
> #define TT_MODE_KSR (TT_MODE_UC)
Absolutely true AND the TTUF_KSR flag passed to sim_tt_inpcvt is only
interpreted
when in upper case mode. The latest code has a KSR mode for TTI which is upper
case with Mark parity. Additionally, there are options to provide SPACE, MARK,
EVEN
and ODD parity for any of the 7 bit character input modes.
Your above change isn't needed anymore, but also won't hurt anything (unless
somehow
you want Upper Case only and a parity option other than MARK). It is best left
off.
- Mark
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