Computer collecting

For many years I collected and rebuild old computers. I think I have about ten old computers right now. But I plan to cut down on them, because I can't meet the upkeep and haven't built any for some time now. The problem I have been dealing with is knowing the ones that have the hard drives or CD rom's that came with them. My memory has gotten so bad that I just can't even remember how to hook them up, but I was good at it once. That old age!!!