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From: Honiewelle <honiewelle AT gmail DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Flat memory access
Date: Thu, 5 Jun 2008 00:25:59 -0700 (PDT)
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On Jun 5, 12:16 am, "Rod Pemberton" <do_not_h DOT  DOT  DOT  AT nohavenot DOT cmm> wrote:
> "Honiewelle" <honiewe DOT  DOT  DOT  AT gmail DOT com> wrote in message
>
> news:ae6d11b5-6353-40d5-be59-775b7ad531bc AT q27g2000prf DOT googlegroups DOT com...
>
>
>
> > oops sorry, I forgot to include the line for declaring variable value,
> > here's the corrected code:
>
> > /* code starts here */
>
> > #include <stdio.h>
> > #include <pc.h>
> > #include <dpmi.h>
> > #include <sys/farptr.h>
> > #include <go32.h>
>
> > int main (void)
> > {
>
> >     FILE *fp;
> >     __dpmi_meminfo mi;
> >     int selector;
> >     int ctr;
> >     int value;
>
> >     mi.address = (0xEC080000); // PCI Base Address register
> >     mi.size    = 1024;
>
> >     __dpmi_physical_address_mapping (&mi);
> >     selector = __dpmi_allocate_ldt_descriptors (1);
> >     __dpmi_set_segment_base_address (selector, mi.address);
> >     __dpmi_set_segment_limit (selector, mi.size - 1);
>
> >     fp=fopen("bar5.txt","wb");
>
> >     for (ctr=1;ctr<=1024;ctr++)
> >     {
> >         value = _farpeekb(_dos_ds, ctr-1);
>
> Don't you want your selector: 'selector' instead of '_dos_ds' ?  _dos_ds is
> another selector for below 1Mb.
>
> >         putc(value,fp);
> >     }
>
> >     fclose(fp);
>
> >     return 0;
>
> > }
>
> > /* code ends here */
>
> Rod Pemberton


Thanks Rod, I'll try what you said... by the way, did someone here
already
have experience accessing memory space i/o in djgpp?

-Honiewelle