Ultrix-11

[Fritz Mueller]

> On Aug 25, 2021, at 10:16 AM, Paul Koning via cctalk <cctalk at classiccmp.org> wrote:
> I have near zero PDP-11 Unix experience, but I remember one flavor (BSD 2.11 ?) which set the top bit in its alleged ASCII output, which of course would break any terminal expecting actual 8 bit coding.

I discovered working with Unix V6 on my '11/45 that its tty output driver is hard coded to always cook bit 8 as a parity bit, for any character where bit 8 is not already set (see Lions, line 8522).

  --FritzM.