Here is an interesting thought. I imagine the A4 to be using the new raspberry pi's? The old model A/B with 26 GPIO pins are so hard to get nowadays.
Reason why I ask is that my model A has broken down but I have like 3 B+'s lying around but the GPIO pins don't match. 26 v 40. Has anyone tried modifying a B+ to work with an A2?
Not sure if it will work for asic stuff. My KNC Titan uses a Raspberry Pi B+ 512mb and that is it...folk tried ..but the asic stuff i heard is pretty 'specific' newer stuff did not work on
the older stuff..i'd assume that would be the same.
Then ebay would be another solution...