1394A external device can't be recognized

techo

hi All,

is there any one had experienced 1394A external device can't be recognized under OS?

I encounter this kind of issue recently.

7 T6 X2 f9 W5 NOS is Vista & XP.
+ u& e% J1 h' _* y
1394A controller is Ricoh.
4 H4 C+ t/ o5 E. [1 D, u5 j/ y
the situation is I could see the removable icon shown on the system tray but there is no device in OS device manager.
4 o5 u( g/ q& [% |8 z
indeed there are some differents but I don't know why.

I wonder it's caused by BIOS but how to prove it?
2 A7 {2 W7 T& }
is there any spec or document could let me refer to?

. O5 w$ r8 `& m( P9 L4 h9 @, YThanks anyway!