it's quite possible that the 2.0 does NOT work on the 1.6, esp since the 2.0 does not emulate the lframe like some of the newer chips do
the lframe became emulated as some versions of xbox did not have the lframe, the xbox 1.6 had an lframe again, but that is what you are using for the d0 point
also if you notice, there are 2 wires on the 2.0 that aren't on the newer chips like the 2.3, one of them is the previously mentioned lframe wire, the other being a wire for voltage (3.3v if i remember correctly) so you would have to find power for that extra 3.3v line as it's probably dead on the lpc point you've got it wired to, and you would also need to find out how/wehere the lframe and d0 would go
