From mboxrd@z Thu Jan 1 00:00:00 1970 From: dave@horsfall.org (Dave Horsfall) Date: Sun, 10 Sep 2017 11:27:48 +1000 (EST) Subject: [TUHS] Happy birthday, Dennis Ritchie! In-Reply-To: <45d1af623f19e5b644b5f0e1ada37f94cea1f2a6@webmail.yaccman.com> References: <45d1af623f19e5b644b5f0e1ada37f94cea1f2a6@webmail.yaccman.com> Message-ID: 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."