AS/400 P03 Questions

Hi folks. I recently acquired an AS/400 P03 "Advanced Portable." This is my first real piece of IBM Midrange hardware, and I have not a clue how to interface with it. I know the OS is a PITA on its own to deal with, but I figure I'll solve one problem at a time. So, I was just wondering, does anybody have any manuals for this sucker (preferably in PDF form!) or know where I can grab them from? There is not a sign of the English manuals for this machine on IBM's website at all. Also, I was wondering if anybody knew how I would go about interfacing with this machine. The DE9 ports on the back of it are definitely not serial ports, and the only other port on it is a SCSI port. Am I missing some cards for this machine? It would almost appear as though the original owner pulled some interface cards for it, but I could be mistaken. Any help would be appreciated! Phil.