> > Which systems interpret 0x7F as "interrupt process"? I know that this would
> > be 0x03 in DOS (^C), and 0x03, 0x04 or 0x1A in Unix (^C, ^D, and ^Z,
> > respectively), but I know nothing about other systems, e.g. Macintosh.
> Very long ago, in the Seventh Edition of Unix, the default interrupt
> character was DEL, because it was (as Uwe writes) available on old
> terminals without the need to hold down any shift key.
> But even then most people changed it to ^C in actual practice.
Yes, DEL has many, many uses in the terminal-to-host direction, as do most
other control characters. I probably use DEL about 1000 times a day.
We all should be familiar with the BS/DEL confusion, but those who aren't
might want to take a look at:
> > 1) What happens if emacs loads Doug Ewell's text file (I.e. a text file
> > containing "ABC<del>DEF") and then saves it? Would the file's content be
> > changed to "ABDEF"?
> No. As part of a text file, DEL has no known significance on any
You can never know what all its uses are. If anybody hopes to be able to
recycle or abolish it, that would be a bad idea. ASCII (ISO 646 IRV) must
remain stable and inviolable for all time.
DEL does indeed have a use in plain text files that are encoded with
Shift-In / Shift-Out to switch between left and right halves of (say)
ISO 8859-1 without having to actually put 8-bit characters in the file.
Ditto for "higher" levels of ISO-2022 character-set invocation (LS3, etc).
DEL is used by some (non-ANSI-X3.64) terminals for specific purposes,
and others for padding.
This archive was generated by hypermail 2.1.2 : Tue Jul 10 2001 - 17:21:19 EDT