Bridge Chipset Used in Sony External Drives?

What is the bridge chipset(s) used in the enclosure for Sony’s external drives? I’m speaking specifically of the combo Firewire and USB2 version (Prolific 3507, Initio 1530, Oxford 912, Oxford 911/Cypress AT2, Initio 1430/Cypress AT2, etc., etc., etc.)

In particular, I need to know if it’s changed since the DRX-810UL, and if so, what chipset(s) was used for the 810UL case?

Also, was the chipset any different between the 810UL and 810UL/T?