char *getDevMemSTR (void) {

    FILE            *fh;
    unsigned char    read[32];
    char            *key;
    int              n = 0;

    key = (char *) malloc(20 * sizeof(char));
    fh = fopen("/dev/mem", "r");
    fseek(fh, 0xFFFF2, SEEK_SET);
    fgets(read, 14, fh);

    for (n = 0; n < 14; n++) {
        sprintf(key, "%s%2.2x", key, read[n]);
    }   

    return key;

}