It's a card to allow your PC (using drivers and a 5250 client) to interface to other machines as a 5250 type terminal, such as an AS/400. I use them at work and they are very useful for people that still use twinaxial cable to the server. you should have a T shaped unit that has a 15 pin connection on the end that attaches to the card's connector, and it should have a coax type connection with 2 center conductors on the other 2 ends. this is the terminator/passthru that allows twinaxial connection. by the way Perle (canada too) still sells ISA, PCI and MCA 5250 emuls starting at $250...of course they usually get about $1.50 at the local junk fests/swap meets. Don't toss it though, someone probably has a use for it. Charles E. Fox wrote: