   }   f.close();  } else {   result = 0x00;  }  digitalWrite(LED, LOW ^ LEDinv);  return(result); }  uint0 _sys_writerand(uint0* filename, long fpos) {  uint0 result = 0xff;  File f;   digitalWrite(LED, HIGH ^ LEDinv);  if (_sys_extendfile((char*)filename, fpos)) 