> Supposedly there is no way to properly implement 100% ISA compatibility on modern PC's after the Pentium 3. FWIW, I think that's probably referring to the fa

> Supposedly there is no way to properly implement 100% ISA compatibility on modern PC's after the Pentium 3. FWIW, I think that's probably referring to the fact that about then, x86 redefined dove of the semantics of the lock prefix. Before about then it'd be propagated out to the FSB as whole system visible transaction, but after about then atomic operations only went out to L2 to increase core count without the cores stepping on eachothers' toes. That being said, very few drivers/cards actually depend on that behavior. Bridging the card to LPC (or worst case PCIe) should be fine for the vast majority of cases.