I made my own SR Boards for my 1st Conversion and found the extra resistors are necessary , and IIRC the CE should be connected to GND ( I think that is called "pulled low" )

http://SimHQ.com/forum/ubbthreads.p...uild-your-own-usb-controller#Post4354517

http://SimHQ.com/forum/ubbthreads.p...uild-your-own-usb-controller#Post4354661

http://SimHQ.com/forum/ubbthreads.p...uild-your-own-usb-controller#Post4354697

Buncan also suggested a 100nF Capacitor be added to the PCB as well , his post also has a link to a useful PDF..... ( this helped stop "ghost" key presses for me )

http://SimHQ.com/forum/ubbthreads.p...uild-your-own-usb-controller#Post4355065

http://SimHQ.com/forum/ubbthreads.p...uild-your-own-usb-controller#Post4356724