> Date:     Thu, 28 Sep 95 13:38:48 EDT
> From: Tom Calderwood <tcalderw@BBN.COM>

> I am trying to use a serial line as a network interface.  When i do
> "slattach ttyb" I get " TIOCSDTR: Inappropriate ioctl for device".
> 
> This command works fine on the sparc port.  Any ideas?

Perhaps you have an old version of the zs driver that did not support
those ioctl commands.  See if your zs driver has these lines:

	case TIOCSDTR:
		zs_modem(cs, 1);
		break;
	case TIOCCDTR:
		zs_modem(cs, 0);
		break;