Thank you @Zack .
I see that J3 pinout has 4 JTAG signals plus some voltages.
Is it enough to connect pins 1 to 5 to the BUS Blaster or should I connect also 6 and 7 ?
I’m planning to solder to J3 position a section of this male header:
Since spacing is different, I would use some female/male jumper wires
to go from the J3 header to the Altera USB Blaster 2x5 cable end:
Hopefully this Altera USB Blaster cable pinout is correct (6,7,8 not to be used):
