are there some special about '\x1a' symbol
Hendrik van Rooyen
mail at microcorp.co.za
Wed Jan 14 09:24:17 CET 2009
"Steve Holden" <stev....enweb.com> wrote:
> Unknown wrote:
> > On 2009-01-12, John Machin <sjmachin at lexicon.net> wrote:
> > I believe that "feature" was inherited by CP/M from DEC OSes
> > (RSX-11 or RSTS-11). AFAICT, all of CP/M's file I/O API
> > (including the FCB) was lifted almost directly from DEC's
> > PDP-11 stuff, which probably copied it from PDP-8 stuff.
> > Perhaps in the early 60's somebody at DEC had a reason. The
> > really interesting thing is that we're still suffering because
> > of it 40+ years later.
> I suspect this is probably a leftover from some paper tape data formats,
> when it was easier to detect the end of a file with a sentinel byte than
> it was to detect run-off as end of file. It could easily date back to
> the PDP-8.
We can be kind of fortunate that the ASCII chars for field separator,
record separator, file separator, unit separator did not catch on in a big
way in file formatting. (remembering the Pick OS running on Reality...)
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