  if (f) {   if (f.seek(fpos)) {    if (f.write(_RamSysAddr(dmaAddr), BlkSZ))     result = 0x00;   } else {    result = 0x00;   }   f.close();  } else {   result = 0x00;  }  digitalWrite(LED, LOW ^ LEDinv);  return(result); }  uint0 _sys_readrand(uint0* filename, long fpos) {  uint0 result = 0xff;  File f;  uint0 bytesread;  uint0 dmabuf[BlkSZ];  uint0 i;  