I could do it with Hercules – I've mucked around with TK4- – but I was actually thinking of implementing a TN3270 and/or TN5250 server under Linux. (In Java, Py

I could do it with Hercules – I've mucked around with TK4- – but I was actually thinking of implementing a TN3270 and/or TN5250 server under Linux. (In Java, Python, Lisp, whatever.) They are just protocols after all, so the server doesn't have to be a mainframe/midrange. In fact, I know some non-mainframe platforms have historically supported 3270 connections – UniKix (formerly known as Sun Mainframe Transaction Processing) is a package for rehosting CICS/VSAM applications on Unix, and it includes a Unix-based TN3270 server. Tandem NonStop supports acting as a 3270 server as well – I think Tandem did that to make it easier to sell into big IBM customers, "you can migrate your apps from IBM to Tandem and keep the same terminals"