[TUHS] Control-T in UNIX

[Jonathan Gray via TUHS]

Mark Kampe's UCLA terminal driver from 1976 had CSTATUS

Code was previously available at
https://github.com/markkampe/ucla_tty
but the repository is now gone (I have it locally).
tty.h:#define CSTATUS	024		/* ^t, the default system status character */

Derived versions show up in the UCLA DSU kernel and the QMC terminal
driver in the usenix 80.1 and spencer uk1 tapes.

On Fri, May 22, 2026 at 09:29:03PM -0600, Warner Losh via TUHS wrote:
> ^T was in 4.3Reno and NET/2. Or rather, CSTATUS was, as was the stty status
> command. It looks like it wasn't on by default in the BSD distributions. It
> wasn't in 4.3BSD or 4.3Tahoe though.
> 
> However, having said that, I remember using ^T on the VAX 11/750 we had at
> the New Mexico Tech CS department that was running a 4.3BSD with a hacked
> kernel (^T from USENET was one of the patches).
> 
> Warner
> 
> On Fri, May 22, 2026 at 9:06 PM Reese Johnson via TUHS <tuhs at tuhs.org>
> wrote:
> 
> > Wow! Thank you so much. I'm a bit younger but I really love Unix. I am
> > located in Georgia too. I use ^T all the time still on FreeBSD. I had no
> > idea GT had something to do with it. Nice to meet you all. This list is so
> > amazing.
> >
> > Thanks
> > Reese KN4NTU
> > 73
> >
> > On Thu, May 21, 2026 at 01:23:02PM -0600, Arnold Robbins via TUHS wrote:
> > > It was indeed posted to USENET, but didn't (IIRC) make it into the
> > > official 4.3 BSD release.
> > >
> > > Scott Lee and I put it in to 4.2 BSD at Georgia Tech, and I think I
> > > put it into 4.3BSD + Mt. Xinu at Emory.
> > >
> > > At GT, I remember a professor who came from MIT being pleasantly
> > > surprised to learn that we had ^T on the vax. :-)
> > >
> > > Rich Salz via TUHS <tuhs at tuhs.org> wrote:
> > >
> > > > My recollection is that Chris Torek at University of Maryland added
> > control
> > > > t to the bsd tty driver and it was made available in 4.3 or so. It was
> > > > posted to Usenet which is where I read about it
> > > >
> > > > On Thu, May 21, 2026, 7:02 AM Ron Natalie via TUHS <tuhs at tuhs.org>
> > wrote:
> > > >
> > > > > When Mike Muuss was playing with enhancing the UNIX scheduler in our
> > > > > (largely V6 based) kernels, we had access to some of the DEC-10 OS’s
> > > > > that did have control-T.
> > > > > Mike added that to our kernel (llisting all the processes running on
> > the
> > > > > terminal) so he could get some feedback on what his tweaks were
> > doing.
> > > > >
> > > > > -Ron
> > > > >
> > > > >
> >