If you want to ask questions about how the machine works, peculiar details, the differences between models, here it is !
How to program the oric hardware (VIA, FDC, ...) is also welcome.
I remember reading somewhere that Oric-1 ULA was different to the Atmos ULA, but I've not found any noticeable difference. I've swapped them over and they work OK. The only time I've noticed any difference is with the Cumulus. But the results seem a bit random