I did not have to specify which Southbridge I was talking about. The IOpener chipset is VIA MVP4, implying that the SB chip is VT82C686A. To my knowledge, no other version of MVP4 was ever done.
> My I-Opener most certainly does have the VT82C586A/B (at least that is the chip ID
That is an ID some software gave you. Either the software is inaccurate, or you took a piece of information incorrectly. Please, open up your IOpener, do have a look at the SouthBridge chip, and confirm that you also have a 686A SB. Please, do it, so that we can avoid the totally unnecessary confusion here. Or you can opt to just trust me on this one: you have a VT82C686A SouthBridge.
> I did and still do want to know your source for the VT8501 registers
Surprise: the documentation. It can be found, you just have to look for it. Or ask.
> For a "Technical" board, your post just seemed a bit light on the details
This is supposedly a BBS for hardware hackers. A true hacker would try to understand what the meaning of all that stuff is. Great, do so. But I don't think I was ever supposed to write a manual documenting all the settings the HDD speed fix does, actually it changes many things. I did try to give a good hint on what the USB fix does, though. It was short enough.
All in all, I gave you the solutions to two major problems. After having done that let me at least expect that whoever is interested enough in understanding what does exactly what, will make the necessary steps themselves.
Again: no offense was taken, but it was an unnecessary nuisance.