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I think that's A000:0000 or, without the segments, 0xA0000 (one extra zero).

0xA000 would mean video memory started not after 640kB, but after 40kB. That wasn't even enough for everybody when the IBM PC launched (the Apple II already had been shipping with 48kB for a few years at that time)

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Yes indeed, quite right!

0xA000 is the memory _segment_ and so the linear address is 0xA0000

I think I would have got this right first time ~20 years ago: ftp://ftp.scene.org/mirrors/hornet/code/3d/systems/gsescher.zip :)

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