console via port a

Hi,
   I use the d9--rj45--db25 (pc to sun port a);
I was able to type and see output from sun E450,
but I can only see the output of E250, but cannot
type.  I have to plug in the sun keyboard to the
e250 in order to type.  I think I can type for
the e250 before, but suddenly I cannot anymore;
is there a parameter in eeprom i need to change
in the e250?  

I try setting boot prom:  input-device to ttya, still
no luck.

anybody has the pin layout for the db9 (female) and db25 (male) in order to console the sun?

thanks in advance