On 7 Feb 2025, at 15:38, Mike Ward wrote:
aa is the version code; these two digits are forced to X'FF' to
identify that the virtual machine is running under VM/370.
Not necessarily VM/370, it could be some other virtual machine. For
example the MTS virtual machine also sets the first byte of the CPU ID
to FF. If MTS is going to close its printers when a job is done, it
will need a reliable way to determine if the VM it is running on
supports that feature. We would also need to know how to actually do
that. Presumably some diagnose instruction, but I have no idea which
one.
Mike
