hey all! i may potentially have a line on an IBM PC server 500 with a P/390, and reading through the documentation a bit i found that IBM used to produce memory expansion daughterboards for these cards. with the P/390 itself being as rare as it is i can't imagine the expansion boards are any easier to find, so it got me thinking: would it be possible to DIY a memory expansion board for this card? has anyone tried? i may have a friend or two who would be willing to collaborate on this so any info or documentation you can provide is appreciated. thanks in advance!