Hello, I was able to make `dump` dump core when I pressed control-4, I didn't test any other key combinations. I was able to do this with 3.8-release and 4.0-current:
[EMAIL PROTECTED]:~$ dd if=/dev/zero of=/test bs=1m count=100 100+0 records in 100+0 records out 104857600 bytes transferred in 1.868 secs (56117006 bytes/sec) [EMAIL PROTECTED]:~$ dump -a -0f /test /var/ DUMP: Dumping sub files/directories from / DUMP: Dumping file/directory /var/ DUMP: Date of this level 0 dump: Thu Jan 11 08:17:14 2007 DUMP: Date of last level 0 dump: the epoch DUMP: Dumping /dev/rwd0a (/) to /test DUMP: mapping (Pass I) [regular files] ^\Quit (core dumped) -- Antti Harri