"Retro Repair" key electronics skills?

I figure I'm good for about eighty hours or so of reading and fooling around with electronics before I'll want to move onto a different hobby for a while (I rotate through a whole bunch). That's my normal MO. So, I'm wondering what kind of skills I could build with that time, once I get started. I'd love to hear if anyone has suggestions for how to use my time wisely to learn skills that would be most useful for working on older machines (mid 80's to late 90's is my focus as far as a hardware bandpass). Here's what I (think) I know now: - Basics about electricity. Ie.. Ohms law, power vs frequency, etc.. - I understand basic physics ("A" in 100-level college course and two years of high school physics, too). I actually had an excellent teacher, too! - I used to do math to about a 300-400 level, but now I'm at a 100-200 level (I can still do most algebra II, some trig, and a few other bits). - I understand what most analog components do (resistors, capacitors, diodes, etc..). I can run a volt-meter, and super-basic operations with an analog scope (checking test points and that kind of simple crap) . I also have a rudimentary rig for soldering etc... - Since I'm a coder, I understand boolean logic (which I hope would help with ICs). - I took a digital electronics course in college. However, it was pathetic and it's all gone now anyway. I've spent most of my technical energy learning coding and sysadmin skills, not hardware. I'm still interested in it, though. I'm most comfortable with self-teaching via projects. Any that you folks would recommend (even if they are for kids, I don't mind, I'm not proud) I'd love to hear about them. Books, project kits, etc.. My goal would be able to understand 40% of what is happening on an Amiga 500 or that level of machine. If I could do that.... wow. fun. cool. Plus I bet I could repair many more items/problems than I can today. -Swift