On Sep 10, 12:26 pm, Ryan Graham <[email protected]> wrote:
> On Thu, Sep 10, 2009 at 10:01 AM, Dos-Man 64 <[email protected]> wrote:
>
> > On Sep 10, 11:42 am, Ryan Graham <[email protected]> wrote:
> >> On Thu, Sep 10, 2009 at 9:26 AM, Dos-Man 64 <[email protected]> wrote:
>
> >> > I have a C++ string class that I am finishing up work on. I intend to
> >> > use this in my applications (whatever they may be.) I am just trying
> >> > to determine a bit more about the underlying architecture and how it
> >> > deals with memory segments.
>
> >> My gut instinct says you are over thinking this. I've never had to
> >> deal with anything like this in C/C++, on Linux, in the last 8 years.
> >> It's possible I just don't understand what you are trying to find out.
>
> > Well, I am coming from a different platform. Actually 2 different
> > platforms. MS-DOS used segmented memory. It is common to allocate
> > memory in 64k chunks or segments. Windows did away with the need to
> > do this, but you use FAR pointers (long pointers or LPSTRs).
>
> > It is for this reason that multiline edit controls were limited to 64K
> > on earlier windows versions. For example, the notepad that comes with
> > windows 98 cannot open text files that are larger than 64k. It instead
> > refers you to wordpad which uses a richedit control.
>
> Ah, ok.. wasn't sure if you were actually referring to segmentation or
> just using a different word for pages.
>
> Linux was 32-bit from the start, so it uses a flat memory space and
> never really made developers deal with segmentation. A pointer is a
> pointer, as it should be!
>
> ~Ryan
> --http://rmgraham.blogspot.comhttp://twitter.com/rmgraham
Yes. However, in fairness to DOS, it ran on computers with incredibly
weak specs. It was common for early versions to run on PCs that had
only 8" floppy disk drives and virtually no memory at all. I imagine
it must have been a bit like programming the atari 2600 :)
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