I think Majuki is absolutely right on the above statement.

Another thing: although some would find this old news, I do think this is useful. We all know BoComm交行 is notorious on forced DCC, and I've seen a lot of their DCCs when using magnetic cards.

However, after using the chip of my CSP on several BoComm terminals which DCCed me before, I can confirm using chip cards automatically disable their DCC capability. Back then, we had to hit cancel on BoComm machines. But with chip cards, no DCC is default.

I feel that maybe these BoComm machines in Beijing have firmware code that doesn't apply DCC when chips are used. Based on my feeling, disabling DCC is not a functionality of the chips, but is merely done by the incompetence of the DCC program code used in these terminals.