I'm almost completed my 18T Model C. However, the A16B-1212-0871 PSU B1 seems to have a empty space between the MAIN CPU FS18 board and the PSU. I'm a bit new to these. Anyone actually using this setup? Hoping someone can figure out which is which and what I need. Is there any documentation I need to read, or software?

I noticed from some reading that the boards that go in the space are:

A20B-8001-0120
A20B-8001-0121
A20B-8001-0122
A20B-8001-0123
A20B-8001-0124

some of these also have A20B-2000-0600 installed in the slot marked JNA

Some of the above boards seem to have A20B-1006-0220 installed.

Also there is another few boards

A20B-8001-0290
A20B-8001-0291

These aparently are connected to PCI cards

A20B-8001-0581
A20B-8001-0582
A20B-8001-0583
A20B-8001-0584

or also:

A20B-8001-0960
A20B-8001-0961

also

A20B-8001-0300

I would greatly appreciate help in this matter. Thanks so very much in advance.