Seeking OS for Altos 486 S1000

[Christian Corti]

Hi,

I was given an Altos 486 Series 1000, and albeit its name sounds 
promising, it's not the classic Z80 based Altos 486, but a modern UNIX 
machine with i486 processor (non-PC architecture) from around 1992.
Problem: no tapes, no hard disk (was removed as it contained sensitive 
data). Has someone by any chance have images of the OS (don't know whether 
they are on QIC tapes or on 5.25" floppies) ? OS should be some AT&T UNIX 
called Altos System V.

Christian