It is not a problem with the USB drivers. I can communicate with the ICD well enough to program the chip. I have also tried v8.9x without success. Fairly sure there is a subtle hardware problem. On 17 February 2015 at 23:54, Brent Brown wrote: > > Since changing the computer I use with MPLAB from an XP based system to= a > > WIN7 (x64) system I am no longer able to debug. > > > > I am using MPLAB 8.43 with ICD2 and programming a PIC 16F87. > > After programming in debug mode I get the message "ICD0083 Derbug. Unab= le > > to enter debug mode" > > Similar happened to me too some years ago, same OS change, but I seem to > recall > I was unable to even program let alone debug. From memory were no 64 bit > USB > drivers available for the ICD2 and no plan to introduce them. The solutio= n > at the > time was to purchase an ICD3, which works fine. > > You might however try upgrading to MPLAB v8.92 which I think is the lates= t > (without > switching to MPLAB X). I've always upgraded and used the latest MPLAB > available, > and have had little to no problem with rebuilding older projects. > > > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 __________________________________________ David C Brown 43 Bings Road Whaley Bridge High Peak Phone: 01663 733236 Derbyshire eMail: dcb.home@gmail.com SK23 7ND web: www.bings-knowle.co.uk/dcb --=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 .