We contacted Siemens in the U.S., and they don't know of a solution for the
Macintosh to connect to their H60 mainframe running BS2000 Operating System.
In general, their H60 supports TCP/IP and RS-232, communication protocols
and interfaces for terminals, modems, and IBM PCs connections. Because
MacTCP and RS-232/422 are supported by Macintosh, you can make a simple
connection between a Macintosh and the Siemens H60 mainframe. However, we
don't have any specific connectivity solutions for a Macintosh and the H60
mainframe.
According to Nixdorf, there is no 8870 model running under UNIX, but their
Targon/31/35 series does run UNIX. The 8870 models run under Nixdorf's
proprietary operating system called NIROS. The 8870 models support
multi-users, RS-232, CCITT V.24 interfaces, SDLC, BSC, asynchronous and
synchronous protocols, and IBM 2780/3780/3740/3270 protocols.
Again, you can connect to the two machines, provided the underlying
protocols and/or interfaces are supported by both machines (Macintoshes and
third parties).