Recent MicroCode Levels allow the use of an integrated vt220 terminal
emulator in addition to the standard line mode terminal. The vt220
terminal is connected to /dev/ttyS1. The line mode
terminal is connected to /dev/ttyS0. If the vt220
emulation is available, an icon for an integrated vt220 ASCII console
appears next to the icon for the 3215 console on the HMC/SE.
To activate vt220 support on your machine, edit
/etc/inittab as user
root. Look for the
following line and delete the leading # sign:
#2:2345:respawn:/sbin/mingetty --noclear /dev/ttyS1 xterm
Save the file and run telinit q
to pass the changes in /etc/inittab to init. The
vt220 terminal should then be ready to use. If not, try hitting
Enter at the terminal until the login prompt appears.
Make sure that you do not apply the changes as described above to a system that does not support vt220 terminal emulators. Otherwise, login might become impossible on this system and you will be shown the following message:
INIT respawning too fast, disabled for 5 minutes.
To redirect the kernel messages at boot time from the system console to
the vt220 terminal, add the following entries to the
parameters line in
/etc/zipl.conf:
console=ttyS0 console=ttyS1
The resulting parameters line would look like the
following example:
parameters = "root=/dev/dasda2 TERM=dumb console=ttyS0 console=ttyS1"
Save the changes in /etc/zipl.conf, run
zipl, and reboot the system.