UNIX SVR4.2 > How do I find the IP address on a Virtualbox system?

I have installed a VirtualBox VM of UNIX System V Release 4.2 and have discovered just how barren the internet is on documentation of it. Only a few modern commands exist, although obviously because the shell is just sh, not bash, which I'm more used to. I can't get syntax help without man and there doesn't seem to be any help or --help. And I have to use "-linux" (subtract results with term 'linux') in all Google searches to get any semi-useful results. Try as I might, I cannot find anything that has the old commands listed for finding the system's IP address, and nothing useful shows up for finding it directly in VirtualBox's settings. I have the network setup packages which came with the old system so I want to see if it can at least try to see the network, but in order to install them I need the IP. Please help if you have any experience at all.