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Subject: Re: puc/sio driver - receives but doesn't send
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From: "M. Warner Losh" <imp@bsdimp.com>
Date: Tue, 25 Nov 2003 23:24:29 -0700 (MST)
> : Anybody have any ideas what might be wrong?
> : 
> : And yes, the motherboard serial ports both work as expected using the
> : same cables, etc.
> 
> I know this is a long shot....  But maybe there's a cold solder joint
> on the NetMOS dual UART board?

Maybe broken driver IC. If you have a line checker gadget that can see
line levels (TXD, RXD, etc.) with LED, you can check whether it really
sending data on the cable. 

// Noriaki Mitsunaga //