How to Print using Envelope Feeder on LW 12/640PS

[Novine]

I am trying to pring mass amounts of envelopes on a Apple LaserWriter 12/640PS with an envelope feeder installed. When I go to print the envelope feeder option is grayed from the paper source. I know I have the printer configured properly because the envelope feeder appears in MS Word when want to print envelopes. Any Ideas!!!

Thanks

[agraham999]

I have a 12/640...what OS are you using...9, X, or earlier?