[Irinikus]

Hi, and welcome.

Here's a site where you can download the O2+ manual: https://www.manualslib.com/download/8857...2Plus.html

The contents of this manual should be applicable to the standard O2 as well.

I will check to see if I can't find a place where you can download the standard O2 manual as well

This page on Ian mapleson's website is also a great source of info: http://www.sgidepot.co.uk/sgi.html#APPS