On Thu, Jan 4, 2018 at 8:44 PM, Manu Abraham wrote= : > On Thu, Jan 4, 2018 at 8:04 PM, David C Brown wrote: >> It is unlikely that the DLLs in two very different systems are corrupted= in >> the same way. >> >> Although I describe myself as a hobbyist I worked for 40 years designing >> digital logic and I know a great deal about the problems that crosstalk = can >> cause. >> >> I have done more tests with the 5cm cable, keeping clock and data apart= .. >> In both working and failing scenes the edge speed of the clock is tens= of >> nano seconds. >> > > If the hardware is ok and the software is ok, then everything else is fin= e. :-) > > AFAICS, WinUSB works with almost every system, without much problems. > MPLAB simply uses WinUSB. > > Another option would be to try with another USB controller. In some rare > cases there are flaky USB controllers/Hubs etc. Thinking a bit more: What about driver signature enforcement ? Maybe it is not allowing your driver not to start. You might need to disable it with Windows 8 http://download.support.xerox.com/pub/docs/WF_6204/userdocs/any-os/en_GB/Di= sable_Driver_Signature_Enforcement-Win_8_8.1_10.pdf Cheers, Manu --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .