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I have Windows 7 64 bit.
I installed Quartus V12.0sp2 and kept getting the error.
Error (209066): The instruction register length for the EP4CGX15BF14 device at position 1 in the JTAG chain is unknown
Error (209012): Operation failed
When trying to program.
I installed the stand alone programmer for 12.0sp2 and hey presto the problem went away.
Just like it did on the previous versions (11.x).....
Seriously guys......
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And now I cannot see USB blaster through the programmer any more.
Seriously. Altera software is utter %^&#.........
If I could walk away from using this joke development system right now I would.
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