release 4.9 sysinstall hangs

[Lee_Shackelford at dot.ca.gov]

Good morning dear FreeBSD enthusiasts.   I am trying to install version 4.9
FreeBSD on a Compaq Proliant 5000 with four Pentium Pro processors, and a
RAID 5 SCSI drive.  The RAID is implemented in hardware.  The installation
procedure proceeds through the steps of device sensing, then prints the
following line "stand/sysinstall running as init on vty0", then stops.  The
program responds to no keys other than "print screen," "scroll lock," and
"pause/break". Depressing these keys in certain sequences will move the
large block cursor from the bottom of the screen leftmost column to the
middle of the screen leftmost column.  There is no response to
"control-alt-delete."  Which device is vty0?  What am I doing wrong?  Is
there a bug in the install program?  Where is there posted a listing of the
device mnemonics translated into plain English for people who are still
learning about FreeBSD?  Thank you in advance for any suggestions.  Lee
underscore Shackelford at d o t dot c a dot g o v.