@Jope
Are you shagging sheep? ;-) As the owner of a HUGE and slowly fading library of C64 originals and [ahem] "other" disks, such an interface is a godsend.
Were it not for people like me converting originals to D64, saving our collections from the ravages of magnetic media fadeout, the rest of you wouldn't have anything to use on your k-rAd, k-k00l, n0n-r0dEnt emulators - and all that speed would amount to ####.
BTW, those that're interested, I'm home now, so will begin seeking the interface schematics. I imagine it's merely a clone of the C64's serial port circuit (like the one I built long ago for use with iec.library's stuff), but I'll have to test it to be certain. :-)