I have two standard ISA serial ports ttyS0/S1 and one internal modem ttyS2 irq5. The modem is working prefectly. But I cannot make ttyS0/S1 to work at all, even with minicom? Is it possible some processes lock out the access? If that the case, why ttyS2 can work freely? And how to resolve it? Does anyone encounter the same problem? HotBot - Search smarter. http://www.hotbot.com