Configuring Linux to use the Mac as a
login: terminal is even easier.
kermit is ideal for this purpose, because it is one of the few free communication programs which provides credible VT100/120/220 emulation.
Essentially, what you want to do is start
kermit on the Macintosh side as in the previous section, but rather than issue server commands, you enter
connect mode. This is the normal terminal emulation mode that most people use, anyway.
On the Linux side, the serial line must be configured with a
getty on it to start a
login: shell. To do this, you need to tell
init that the serial line has a terminal on it. In your
/etc/inittab file you will need a line something like this:
T1:23:respawn:/sbin/getty -L ttyS0 9600 vt100Be sure to substitute the appropriate serial device for
/dev/ttyS0and the correct baud rate for
9600in the command line above.
This command tells
getty to start
-L switch) on the terminal display, and, when the login times out, to re-start (
respawn) the login program until someone logs in. If no device is connected to the serial line, or if the connection is defective, you may see a message on the system console like:
/dev/ttyS0 respawning too fast: disabling for 5 minutes. If this happens, you can return things to normal by (as root)
getty process, or using the
init q command. Both of them have the effect of re-spawning the
getty processe(s). If everything is in order, you should see the Linux banner and login prompt on the Mac's
kermit window. That's all there is to it.
Also, if you use something besides vanilla
getty_ps, the command above will look somewhat different. The important thing to remember is that everything to the right of
/sbin/getty is an argument for
getty itself; not
init. You should look at the manual pages for
inittab if you have questions concerning the setup of
The Serial HOWTO provides helpful details on how to configure
getty_ps, if that's what your system uses.
To transfer files back and forth between the Macintosh and the Linux machine, you can (via the Mac's Kermit) issue the
kermit -x command to start the Linux
kermit in server mode. You can then use the normal file transfer commands to send files across the serial line. It's useful to set a prompt in your
~/.kermrc with a line like
set prompt Linux-kermit >Otherwise, remembering which machine you're on can quickly become confusing.
This method should work equally well for any other Mac terminal program. If you have ZTerm, you can use
sz on the Linux machine to transfer files via the ZModem protocol. If Microphone Lite came bundled with your fax modem, that works equally well, albeit without
kermit's superior scripting and configuration facilities.