> 
>   I just have a little question ( no more trouble ) when I boot as a single user
> I got a message during the booting saying terminal what shall write is it
>  vt220 ? and how can I reboot the mac to go on multiuser (shutdown-r now ) makes
> my unix crash the debbuger turns on

It is a vt100 these days. It used to be a vt220.

To go multi-user, just type "exit" from the single-user shell.

Take care,

Bill