Wed Aug 14 14:55:59 EDT 2013

USB packet sizes?

Guess is: timing error due to packet sizes.

Doesn't seem to be it...
So what is the problem?

It is very unpredictable...  a noise thing?

So I got it to go a bit further.
Now 3 cards run up to:


And then things freeze: one byte is received (CLA = 0) and waiting for
the next 4 bytes.  No resets, no VCC off, nothing..