>At 21:41 20/07/2000 +1000, Angus Lees wrote:
>>i just keep triggering BREAKs when i plug/unplug serial cables and
>>start/quit terminal programs - and they cause the whole machine to
>>freeze until you wire it all up again and type "go".
>
>Plugging or unplugging a serial cable shouldn't send breaks, switching on a
>dumb terminal will send a break. For that reason you want serial lines
>unplugged when powering on/off terminals. I suppose some terminal programs
>may send a break when they start up also, though that sounds rather an odd
>thing to be doing as a default action.. I actually like using cu rather
>than minicom if i want terminal access to a machine through a serial
>port. Nothing fancy, it's the 'ed' of terminal software.
I seem to remeber the Sparc ROM monitor also responds to loss of the
handshake signal (DTR?) as if break had been hit. So unplugging it would
return to the boot prompt. I think there is an option to ignore DTR
loss.
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