I usage home made JDM and work for me 100% good.
You must look to RS232 cable must be max 50 cm langht !!!
If you need precise explanation of my JDM copy I send you
full datasheet of my.
I usage JDM with PonyProgrammer and also with ICprog last version !!!
In these moment I usage Windows Vista Ultimate and JDM work 100% with
these to software .
So if you need my help I will send you all about my copy of JDM.

[email protected]

best regards phoenix_1