Date   : Mon, 10 Jun 2013 23:21:15 +0100
From   : jgh@... (J.G.Harston)
Subject: Acorn newline sequence

Andrew Rowland wrote:
> I guess you would have to register the time the key was held down 
> like the
> auto-repeat feature does, inserting one sequence for a really short 
> hold
> and another for a slightly longer one (allowing for debounce as 
> well).

That's how you got the Ctrl-Break functionality in OS 0.10. Break did a 
soft Break. Break-Break in less than about 1/3s did a hard Break. The 
Reset code set a flag that got cleared a little later, and if on entry 
to the Reset code it was still set it was because the startup code 
hadn't got far enough to clear it, so Break had been pressed twice 
quickly.

JGH