Any idea how one would find hardware documentation? I have an old "small" mainframe and I'm curious about some of the hardware (backplanes, connector pin outs, etc) but after dozens of hours spent searching, I only found an SSA pinout by a curious hardware engineer.
Unfortunately, I have a S/390 and bitsavers only has a few things. However, those things relate to a different system which uses the same chassis, so I'll take a look. Thanks.
