IBM 5100 Restoration in progress

Update: Unfortunately, I think I'm at a dead end. After cleaning everything up, I am still at the "A" in the "Bring Up" program that isn't very far but it's better than garbage. I removed both memory cards and get garbage so the memory cards might be working (I have two and tried both individually). I think my problem is in the "Basic I/O" card as indicated in the Maintenance manual. I am also not able to get into the Diagnostics screen because it must be failing too early. Either that or my keyboard isn't working. It's hard to tell. I'd be happy to try to replace some of the logic chips but IBM uses their own numbering scheme. Does anyone know of a way to read them? I assume they are normal logic chips but with IBM numbering in most cases? Ali, thanks for the link. I did look over that document a while ago but the Maintenance manual is also very thorough in regards to the 5106 tape drive both internally and as an external unit. The rollers look great and hard in both the internal and external unit but I obviously can't test out either at this point. Anyway, I did clean it up and took some more pictures to document where the cards go. Thanks to Dave Dunfield's IBM 5100 site, I was able to figure it out. Much appreciated Dave! I have also taken pictures of my cards and where they go. You can find new pictures here: http://vintagecomputer.ca/ibm-5100-in-pictures/ On Sun, Mar 15, 2015 at 3:12 PM, Ali <cctalk at fahimi.net> wrote: