Thanks!  But it still does not work.

I should have included in my original posting that
the same modem, with the same cable, and the
same chat script, work perfectly under NetBSD
1.3.3 on my SE/30.

I nonetheless tried various modem initialization
strings, both with crtscts and nocrtscts, on the
PB.  The ATZ string just locks the port
(ps -aux  shows the process, which does not
respond to kill -9); other strings
(AT&D0, AT&F, AT&F&C1&D0&Q5)
yield a message back from chat

chat[pid] Can't get terminal parameters:
 Operation not supported by device.

The device is a Hayes modem; these strings
all work from the SE/30.

Doug




Frederick Bruckman wrote:

> On Tue, 13 Apr 1999, Douglas R. Troeger wrote:
>
> > I am having trouble accessing a Hayes external modem
> > connected to my PB 145 B, running the 19990322
> > Generic-104 kernel.  The modem speed is 14.4.
> >
> > My chat script (from Mark Andres' FAQ) hangs at
> > ATZ -- the OK response is never sent (I am
> > looking at tail -f /var/log/messages
> >
> > /usr/sbin/pppd /dev/tty00 19200 connect
> >  '/usr/sbin/chat -v  "" ATZ OK ATDT###-####
>
> Maybe your cable doesn't transmit the CTS signal. Many older Mac modems
> were sold with such a so-called "Macintosh Software Handshaking" cable.
> Try adding `nocrtscts' to the commandline to see if that gets you any
> farther. If so, you'll probably want to enable software handshaking, at
> least. For serious use, you'll want to get the "Macintosh Hardware
> Handshake" cable, and use `cdtrcts', and also AT&D0.