Thanks for replying, Bill, Nakata-san and Yanagisawa-san.

 > Date: Thu, 5 Mar 1998 11:39:19 -0800 (PST)
 > From: Bill Studenmund <wrstuden@loki.stanford.edu>
 > 
 > On Thu, 5 Mar 1998, INOUE Katsumi wrote:
 > > Boot still stops at 'zstty0' line most of the times even if I tick the 
 > > Booter option 'Serial Port->Open before...' on. But sometimes it just boots
 > > fine.

I found a workaround. In Mac-OS, if I just let AppleTalk use
'ethernet' or 'remote'. It always boots fine.

Regards,
Katsumi INOUE