break on pdp11 serial ports

[John Wilson]

On Fri, Mar 30, 2018 at 05:46:14PM +0200, Sytse van Slooten via cctalk wrote:
>That's where the questions start. How did a DL-11 like interface signal the 
>reception of a break?

NUL with a framing error.

>And how did the operating systems and software deal with it?

However it wanted!  In some cases it was interpreted as a ^C.

>Was it actually used at all?

It's pretty rare to care about receiving them (except for bringing up
MicroODT on TT0:, but that's not what you're talking about).  You'll want
to be able to send them if you're going to support TU58s though.

John Wilson
D Bit