I also wonder - if there is no sd card - can you upload a sketch like you do with the arduino/avrdude ? Like if you want to test and find out you need to change things, do you have to compile and put the new hex file on the sd card first?
using the uno as a programmer I disable the reset signal using the cap, right?
and the arduinoISP sketch resets the target when it needs to, right?
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