For trade: IBM 5028 Operator Station from System/7 http://ees2cy.engr.ccny.cuny.edu/wwwa/web/hardware/ibm5028a.jpg http://ees2cy.engr.ccny.cuny.edu/wwwa/web/hardware/ibm5028b.jpg As you can see the machine is not pretty. Fortunately the cracked part of the case is not lost. (It fell in.) I bought a ribbon, powered it up and typed on it a little bit and at least that part of it works. I would like to trade this for something pre-1980 made by Tektronix. -kurt