Hi Chony
I don’t have a Tyros, but looking at the Yamaha Support Site you should have a Data list Document with your Tyros, which gives all the information on the Tyros Midi Spec.
If you do not have this document, then follow the link below, and type Tyros in the search box, you will then be able to download the Data list as a PDF file.
Hope this helps.

Bill
http://www.yamaha.co.jp/manual/english/result.php?div_code=emi



[This message has been edited by abacus (edited 07-31-2005).]