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Do All a good programmer, second revision circuit board hard to etch and prone to many shorts. use the first version and apply the mods especially if using ST 232 chip. I can confirm that the adding of the extra resistor and modifying the value of others fixed all problems.
I had a lot to do with the testing of this device and the mods were suggested by me.. also have helped many out hwo had problems after buildiing it.
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