From: "A. Sinan Unur" <sinan DOT unur AT cornell DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Problems with pointers
Date: Fri, 30 Jan 1998 10:51:51 -0600
Organization: Cornell University
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Liche wrote:

> void PCXimage::showbuffer()
> {
>      dosmemput(imagebuffer, 64000, video_buffer);
> }
> 
> A general protection fault occurs, and the program terminates.
> video_buffer is an  unsigned char * to 0xA0000, the physical address 
> of VGA memory. Does anybody know how to resolve this problem? Please 
> email me for the complete source.  Thanks

this is actually a FAQ in disguise.

try
  dosmemput(imagebuffer, 64000, 0xa0000);

or, equivalently,
  movedata(_my_ds(), (unsigned) imagebuffer, _dos_ds, 0xa0000);

  -- Sinan