MS-DOS Memory Management on x86

I review the history and evolution of memory management in MS-DOS on x86 PC architecture.
0:00 Introduction/terminology.
0:53 Origins of MS-DOS.
1:33 8086, 80286, 80386 memory model. Real/protected modes.
3:17 PC address space. DOS address space and memory terminology.
6:46 Expanded memory.
8:26 Extended memory.
10:18 DOS Extenders.
11:35 Microsoft moves to Windows.
12:21 Conclusion.