Eh? Maybe I've forgotten after all this time....
but I don't remember ever having an incompatability problem with the A1000. I had friends with A500s and we swapped games and demos all the time and it all ran fine. In fact they were all envious because I had a Commodore IBM 512k 4.7mghz XT sidecar(which was like the A2000 bridgeboard but even had it's own slots and I upgraded it with an AT/286 8mghz accellerator) with a hd you could partition for the Amiga and the A1000 could access it. That sidecar was pretty useful for highschool programming classes in pascal.
The only thing that annoyed me was booting up kickstart, and even worse booting up that Janus software to get the hd on the sidecar going.. But I digress.. I'm pretty sure the A1000 switched between PAL and NTSC effortlessly on my monitor (never bothered with the TV out though but what would you expect). Was I just lucky or something? I've got 2meg ram so the A1000 was fairly functional for the day. I bought my A1000 used after the A500s came out. I sought it out as a preference.
My only lament was the dependency on the internal drive to bootup kickstart and then having to switch disks to get workbench going. I would've rathered it would have booted up from my external drives if only to avoid wear and tear on the internal one. Actually if someone knows of a software fix for this I'd love to give it a go. I also have a 5 1/2 drive for it, and I wonder if the disks still work after all this time.
No, the A1000 is an excellent machine, but don't expect it to perform any functions required for today's computing experience. Just your basic games and demos and mucking around with some ancient apps. As soon as I get the space I'll be setting it up again. Of course, as a precaution I actually bought a spare A1000 cheap that had a wrecked case just in case I needed parts. It also still works.
A little while ago, I saw a company on the internet that were selling A1000s with x86 mobos inside them. It would be kind of cool if it booted up straight into a later and nice looking AmigaOS without flashing windows or Linux stuff at me.
I still reckon the A1000 is a classic in it's design. It is just so cute, especially with the A1081/4 monitor. And the keyboard garage. They just don't make them like they used to. I feel the same way about all the Amiga models that look different to your dull PC box of the day. I still love that machine and I haven't loved a machine since.
Ok. Going back to my happy place now. 
