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Originally Posted by Photon
- Wasn't there a kick 2.0 A500 then? Rev7 pictures seem to show a kick 1.3. (Wikipedia says no. I guess we must have bought them as an upgrade and swapped them.)
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True, none from the factory. Us "power users" swapped them in ourselves.
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- Can you have 1MB chip + trapdoor RAM on any A500? (I guess not, since it requires 8372 and this will always map extra RAM as chipmem?)
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You need to build an additional circuit to enable this. Many oversized trapdoor expansions had a Gary board that handled that stuff.
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- ... But the "always" is just not true, since my Rev 6A's have 8372 and keeps slowmem as slowmem. 
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The easy choices there are 1MB chip or 512/512. They didn't configure them for 1MB chip from the factory, probably due to compatibility reasons.
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- Can an 8371 Agnus be retrofitted to an unmodded Rev 6A board without conflict with the other chips or incompatible with some software? (The Rev7 seems to have done so?)
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It is fully compatible. You will be limited to 512k of chip after that.
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- Did Rev8 have RTC then, and was it the only A500 revision to have it?
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As ajk said, if the rev8 board was in a computer with an A-500 badge, no RTC was populated and there is only 512k of RAM. If the board was on an A-500 plus case, the RTC + battery were installed and a full 1MB is on the board.
For the downgraded rev8 A-500, one TTL chip is also missing and some jumpers are in a different order for it to be a 512 mobo/512 trapdoor setup. The jumpers can be adjusted, the missing RAM chips and the TTL chip added for it to become an A500+ with 1MB on the mobo and 1MB possible in the trapdoor. Instructions are pretty easy to find here on support.hardware.