Any AS/400 experts around?

I'm now the proud (?) owner of an old AS/400, Type 9406 Model B45. Assuming that when we managed to let the rack fall on its side that we didn't destroy it; this is yet to be determined. Anyhow, I have very little (bordering on no) clue about AS/400s, so if anyone else knows about them, tips, advice, help, or the like would be greatly appreciated. The system came with about twelve Type 9332-600 disk drives (600M each), a Type 9348-001 nine-track drive (which is an HP 88780 with a custom front panel), and two terminals (but only one keyboard). It appears that the disks and tape drive are differential SCSI devices with Sun-style 50-pin D-sub connectors. I vaugely recall reading in the past that AS/400s use a weird sector size that is not a power of two; most high-end SCSI drives can be reformatted for alternate sector sizes. The CPU box contains: part feature upper lower slot number number connector connector function ---- ------- ------- --------- --------- ---------- 1 66X4709 3060 16M memory 2 66X4709 3060 16M memory 3 66X4490 3055 8M memory 4 21F5132 2513 processor? tamper seals! 5 93X2120 2514 ??? 6 93X2701 2601 50 female tape interface 7 93X2709 6110 50 female disk interface 8 46F4141 6130 ??? 9 26F5028 6031 50 male 50 male ??? 10 59X4270 6040 25 female ??? 11 93X2737 6110 50 female second disk interface? 12 blank panel 13 blank panel I guess that one of the cards in slot 9 or 10 must be an interface to terminals or to a 3174 terminal controller or the like. The IBM AS/400 web site doesn't seem to have any info on hardware this old. I'd really like to get an ethernet interface. I got factory-sealed 9-track tape distributions of two different releases of OS/400, four tapes each. I gather that there's some sort of license key needed for the software, so I have no idea whether I'll be able to install it. Naturally when I got the machine the seller didn't make any arrangements for a license transfer. For the price I paid I suppose it would be unreasonable to ask them to jump through hoops to do such a thing.