How to startup oracle9i without using windows services

Hi list, i would like to know how you guys do to startup oracle9i in winxp without using the windows services. I'm trying with a cmd window using:  

sqlplus / nolog -- That's ok  

connect / as sysdba -- Getting this error ERROR:
ORA-12560: TNS:protocol adapter error  

I've noticed that once the db is running (started with services) i can connect īn a cmd window using the above command.  

Any clues??  

Regards
GBA

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