[Koshkin]

Using a real mainframe in order to run legacy code is probably the most expensive way to do so I can think of.

[neverartful]

Oh? Even when your environment uses z/OS, z/VM, CICS, DB2, and a whole slew of other IBM and 3rd party products? Do you know that all mainframe software is fully supported when run on a mainframe substitute? I have no idea whether it is or isn't.