Thank you for the responded people.
  demarthe_at_alpha.cad.cea.fr
  golden_at_falcon.invincible.com
  tpb_at_zk3.dec.com
  rajul_at_zk3.dec.com
1.Ppeople from DEC said DU 3.2C can only use DE500XA. 
  Clone boad is not fully compatible though it uses 21140 chip in it!
2.Some system will need latest firmware to recognize the board.
I installed PLANET FW-9500 board and hit the case 1.
Some driver on NetBSD/Linux may or may not help me to write one on DU.
Thank you again,
Naohiko Shimizu 
 Dept. Communications/Univ. TOKAI. 
 1117 Kitakaname Hiratsuka 259-12 Japan 
 TEL.+81-463-58-1211(ext. 4084) FAX.+81-463-58-8320
Received on Wed Feb 21 1996 - 19:16:00 NZDT