Key location count

[f-israel]

I'm using ACS ACR122U as reader/writer. According to their docs there are just two key locations (00h~01h). The source code assumes an incrementing location index.

So the question: are just two key locations common for card reader? If so I'd submit a PR for this case.

[Diggsey]

I'm using the SCM SCL3711 and it also only supports two key locations (0x60 and 0x61) and these locations are supposed to correspond to "Key A" and "Key B" respectively.