I'm studying for the a+ exams--okay, who in this forum isn't or hasn't? Anyway, I'm in the portion on operating systems. I thought I was well-versed on dos. But the part on memory is kicking me. I'm using Marcraft's Top Score study system, and it's pretty comprehensive and detailed, but maybe it's just the way the stuff is worded that I can't get it. Does anyone out there have a good resource for learning all about memory--conventional, upper, high, extended, expanded? See, I know the words, I just can't grasp how and when each is implemented.