10 Sep
2017
10 Sep
'17
3:27 a.m.
On Sat, 9 Sep 2017, Steve Johnson wrote:
Part of that problem was probably electronic, not
software. Many of
the early terminals were half-duplex. The normal mode was that the
terminal typed what came over the line, and the keyboard was locked. If
you wanted to let the terminal send data, you needed to send a control
character to unlock the keyboard, and then another one to lock it when
you wanted to send data again.
Aah, well I remember the times that I felt like leaning over to hit
the Big Switch on our 360/50, when the console jammed...
That was the Blue Button, of course, not the Red Switch (we weren't
allowed to pull that).
--
Dave Horsfall DTM (VK2KFU) "Those who don't understand security will
suffer."