#include <mem.h> 

#define MONO_BASE 0xB000 

/* saves the contents of the monochrome screen in buffer */ 
void save_mono_screen(char near *buffer) 
{ 
   movedata(MONO_BASE, 0, _DS, (unsigned)buffer, 80*25*2); 
} 

int main(void) 
{ 
   char buf[80*25*2]; 
   save_mono_screen(buf); 
}