Has anyone been able to use zmodem to transfer files from NetBSD to a
terminal logged in over a serial port?

I have NetBSD 1.3 on my Mac.  I compiled the sz/rz stuff from
ftp ftp://ftp.cs.pdx.edu/pub/zmodem/rzsz.sh

It seemed to compile fine.  Then I logged into the mac using a terminal
program on a different machine on /dev/tty00.  I can log in fine.  When
I try to 

sz filename

The download (NetBSD/mac68k -> terminal program) gets part way and gets hung.
Then I get a login prompt back.  So somehow the zmodem transfer is causing
me to get logged out.

Any thoughts?

Thanks

Dan