Still no luck on the NorthQ, I have had a couple of replies from Raidsonic and Novatech regarding their IDE only enclosures.
Raidsonic say that their Icy Box IB-550U uses a Cypress chip.
Novatech’s own brand NOV-525ENC enclosure also uses a Cypress chip. I sent a sales enquiry via their web site and sales manager at one of their branches went to the trouble of ordering one, opening it up and e-mailing me the numbers from the chip. (Thank you:flower:)
Novatech 5.25" External Drive IDE Enclosure USB (NOV-525ENC)