Problem with apollo II on dell power edge t20

[Lukasz Golonka]

Hello,
i have tried to use my apollo II externall synthesier with speakup on my dell power edge t20.
Unfortunatelly after executing modprobe speakup_apollo there is the message "can not insert speakup_apollo no such device.
I'm sure that linux work with my serial port, because i'm able to type echo test >> /dev/ttyS0 and hear apollo speaking
There isn't also a  problem  with distro which i'm using,, because i'm able to use the same live cd with apollo on another
machine.
Thanks for any help 
Greetings
Lukas