This is my story.... When I first connected the JDM and did the measuring procedure i had realy strange readings. I red every post with JDM troubleshooting and loading up a bootloader. I tried everything that was posted here, tried 8 computers, external power and so on . I didnt giv up, in 100 combinations of settings and io drivers only one worked. This are my readings from pc at home (settings mentioned in ucapps page/JDM MODULE) PIN 1 (MCLR#) - PIN 12/31 VSS = 12.9V DURING READING = 1.5V Other reading where probbably fine (MOST TROUBLE I HAD, I HAD WITH MCLR AND - PIN 1) PROGRAMING ERROR NEXT TIME A STARTED IC PROG PIN 1 (MCLR#) - PIN 12/31 VSS = 0.5 V !!!! PC WITH WIN 98 PIN 1 (MCLR#) - PIN 12/31 VSS = 0.5 V !!!! Same thing!!! ANOTHER XP PC PIN 1 (MCLR#) - PIN 12/31 VSS = 0.5 V !!!! Same thing!!! So I accidently, while I was measuring, MCLR voltage I started with moving the cable and i dicovered voltage rising up to 14-15V and back again!!!! The cable was new and I was fine, conector too, and everything else. So I knew there is some how a way to get 14-15V on MCLR ( with no external power), and during the reading too. After that it hit me, I dont know where from: I`ll try IO delay mode : 4 !!!!!!! (THAT IS THE ONLY DELAY VALUE THAT WORKED!!!) THESE ARE CONFIGs (XP WIN) IO DELAY mode : 4 TALIO SYS driver (http://www.talkingelectronics.com/FreeProjects/MultiChipPgmr/MultiChipPgmr-P3.html) - instructions on the site WINDOWS API Enabled MCLR as VCC (I2C menu) Enabled Vcc control for JDM THIS IS HOW I GOT MY JDM WORKING AND PROGRAMING the PIC !!!! Best regards thorsten, I hope this will hel others because we all now how can JDM be frustrating. The JDM is a final stage in any MIDI box project, and when u get everything done, all you have left is PROGRAMING the pic so you get crazy when it doesnt work. (I did!) ziGI_cro