So I started refurbishing one of the Apple II+ machines I recently aquired. So it seems like the previous owner (unknown) not only made some of his own periheral cards but did some under mother-board mods that surprised me. My background is computer use, networking, coding, etc and while I have some basic understanding of electronics and circuits, I could use some bigger brains to help me slueth out what this previous owner was up to. Attached is a photo of the MB. The red lines I drew in represent the jumpers (excellently done mind you) under the board. I have identified the pins in the destination chips. 2 of the jumpers come from the keyboard socket. The other from a chip in the upper right by what I think might be video circuits? I am looking over the Apple II+ schematic and researching the chips to see what I can conclude. If anyone has thoughts on these mods please share. I don't think they were jumper fixes as there don't appear to be damaged traces. I think they were deliberate, but to what end. I left the image at full resolution to help see the details. Sorry its so giant.