segmentation fault when porting to linux

I want to move to linux from DOS / Win98, and the piece of hardware
communicates this way (see snippet below).

This snippet works just fine in DOS / Win98, but in linux it fails
with a segmentation fault. Any idea how to make it work?




#include <stdio.h>

typedef unsigned long DWORD;
typedef unsigned char BYTE;
typedef unsigned short WORD;

volatile WORD *memory_word_pointer;

DWORD pmem_address = 0xD4000;


void *return_address (DWORD address)
{
return (BYTE *) address;
}


int main()
{
memory_word_pointer = (WORD *)return_address (pmem_address);

*memory_word_pointer = 0x1000;
return 1;
}


.

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