> 
> You're not still running minicom while starting up sexpots are you, or
> is something else maybe holding your tty device open?
> 
> If I have minicom running and try to start sexpots then the
> initialization command is echoed there and not back to sexpots.
> 
> use losof of fuser on your /dev/ttyS0 device and see what else might be
> using the device.

Hi Nelgin!

I'm pretty sure that no other process are using and lock the port, modem 
are working (I can establish connections using minicom)

Nullmodem cable with another computer also work. So no hardware problems 
related.

root@scarlet:/sbbs/ctrl# setserial /dev/ttyS0
/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4

lsof output was empty:

root@scarlet:/sbbs/ctrl# lsof|grep ttyS0
root@scarlet:/sbbs/ctrl#

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