Wanted: Pointers to Unix hosted on IBM 4381 (like 370)

[M.AJEMIAN]

UNIX on IBM mainframe architectures:
    Amdahl has probably the best UNIX port to IBM mainframe architectures.
It's called UTS (for Universal Time Sharing, they say) and is presently up
to SVR2 and there are Amdahl people porting SVR3 right now.  It's fast,
reliable (relatively), and supports layers.  Just about everything compiles
the first time, usually faster than the output of make can be displayed at
1200 baud.

This message is being sent from an Amdahl UTS system.

$ uname -a
uts homxb 5.2.4 5 580