It may be dead to you but it sure aint to me and yes it's still going strong for a 25 year old piece of computing hardware... 
The point I was making (as you don't seem able to grasp it) is, when compared to the Amiga forums and current Amiga scene all the others I have listed don't seem to have the same amount of still active users posting on them...
The Atari 8bit scene is very active, hardware and software projects and games being produced all the time as well as demos. The 8bit computer section of Atariage sees more posting action than any other forum for any other machine most of the time.
As that is a 1979 machine that technically is the oldest one.
Having said that very few machines don't have a working emulator STILL, classic example is the Memotech MTX 500 or 512 machines. Real shame as I have working ORIC/Aquarius/TRS80/TI99/ZX81 and other emulators.
Also whilst the Archimedes from Acorn has a good emulator, very few games have been cracked properly so can not be put onto ADFs for use with the emulator. The TOSEC is pretty small. But then they have a nice little £100 kit to build a RISC-OS compatible machine too.
