[Wlug] KVM to SUN converter??

I'm not sure what I am talking about. I know that the terminal for my SUN ULTRA1 is different than the terminal for my DELL PC. I have purchased a IOGEAR KVM switch. I would like to include the SUN machine in the set of computers that can share my one keyboard, mouse and terminal. What do I order which will make this possible? Ken Jones of Fitchburg.