The cost of maintaining old versions is constant, spread over an ever-dwindling customer base which is why the price grows exorbitant. That said, Bull still mai

The cost of maintaining old versions is constant, spread over an ever-dwindling customer base which is why the price grows exorbitant. That said, Bull still maintains the GECOS mainframe OS that was already obsolete when it gave UNIX the pw_gecos field in the 70s, but you have to pay for it.