STOP-A on serial line

[Hartwig Atrops <Hartwig.Atrops@t-online.de>]

Hi all.

I want to do some tests with Debian Sarge on an Ultra2 and try to make a 
barbone work again. Added CPU and memory - since this machine has no 
graphics, I attached a terminal (DEC VT 420) to serial A.

How can I send STOP-A from my serial terminal? The machine tries to boot from 
network. That's not what I want.

Thanks,

   Hartwig