UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Control-C, etc

TonyDuell · 5th Jun 2021, 4:14 pm

The PC use of the control codes is totally different from their original ASCII meaning, where, for example Ctrl-C is ETX (end of text). Ctrl-G was BEL (ring the bell) in ASCII, on things like the Teletype Model 33 it mechanically rang a little bell inside. On the electronic Teletype 43 there was a solenoid-operated bell (and as a total aside, on the DEC VT5x series of terminals like the well-know VT52, the keyclick was produced by a little relay on one of the boards, the bell consisted of feeding a square wave to this relay so that it buzzed).

There is no control in baudot/murray code (both techincally incorrect names for ITA2). The figure shift of J rang the bell though (or closed a pair of contacts to operate an electric bell)

I seem to remember the early Apple Macintosh machines had 'command' key, often called 'splat' due to the symbol on it, and command-C was cut, command-V was paste, etc. I think Windows simply copied the same letters. But it's been a long time since I used such a machine.

5th Jun 2021, 4:14 pm	#9
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,208	Re: Control-C, etc The PC use of the control codes is totally different from their original ASCII meaning, where, for example Ctrl-C is ETX (end of text). Ctrl-G was BEL (ring the bell) in ASCII, on things like the Teletype Model 33 it mechanically rang a little bell inside. On the electronic Teletype 43 there was a solenoid-operated bell (and as a total aside, on the DEC VT5x series of terminals like the well-know VT52, the keyclick was produced by a little relay on one of the boards, the bell consisted of feeding a square wave to this relay so that it buzzed). There is no control in baudot/murray code (both techincally incorrect names for ITA2). The figure shift of J rang the bell though (or closed a pair of contacts to operate an electric bell) I seem to remember the early Apple Macintosh machines had 'command' key, often called 'splat' due to the symbol on it, and command-C was cut, command-V was paste, etc. I think Windows simply copied the same letters. But it's been a long time since I used such a machine.