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