Great article as always! I especially like the section on "A historical look at pins and timing". Unless I'm misunderstanding the terminology, there may be an

Great article as always! I especially like the section on "A historical look at pins and timing". Unless I'm misunderstanding the terminology, there may be an error in the discussion of the shift/crossover circuit. And a minor typo... > The [buses] can be connected in three ways: direct, crossed-over, or swapped. > The "direct" mode connects the 16 bits of the C bus to the lower 16 bits of the address/data pins. > The second mode performs the same connection but swaps the bytes. > The final mode shifts the 20-bit AD bus value four positions to the right. It sounds like those two modes got swapped? ;-) For clarity, I think I would change the order in the introduction and use the mode names instead of "second" and "final": > The buses can be connected in three ways: direct, swapped, or crossed-over. > The "direct" mode connects the 16 bits of the C bus to the lower 16 bits of the address/data pins. > The "swapped" mode performs the same connection but swaps the bytes. > The "crossed-over" mode shifts the 20-bit AD bus value four positions to the right.