Yes, I know what IIRC means. If you misremembered, then I'm happy to hear a correction - that's why I keep asking.
You _still_ only have to check inside your machine to see if this is true. The question is simple - does or does not the Omega have the M1353+ SouthBridge which is present in the Iyonix - if not, then what? It should be clearly visible on the motherboard.
Of course I am being stubbon about the compiler issue - you've given me no reason whatsoever for anyone to change their mind about this, so I do not see what calling me that gains you.
I have no explaination for the ATA100/133. But again, that is why I asked, because it is inconsistent about what I've been told about the various SouthBridge chips.