Hi,
Ok thanks. But I've got a problem. I have 3 memorycards. 2 "normal" ones and
one card with a PIN authentification mechanism. Only this card returns a
ATR when I send:
unsigned char GET_ATR[] = { 0x20, 0x12, 0x01, 0x01, 0 };
What's the problem?
Thanks
On Fri, Dec 08, 2000 at 09:05:04AM -0000, Guillaume LAISNEY wrote:
> Hello,
>
> You can get the size of a memory card from the second byte of its ATR.
> According to ISO 7816-3, the 3 LSB of this byte define the length of data
> units (in bits), and its 4 next bits, the number of data units as :
>
> 0000 = No size specified
> 0001 = 128 data units
> 0010 = 256
> 0011 = 512
> 0100 = 1024
> 0101 = ???
> ...
>
>
>
> Example :
> ATR = 92 23 10 91
> 23 -> 0 0100 011 -> 0100 data units , 011 bits per data unit
>
> This card is a 1 kb memorycard...
>
>
> Regards.
>
> Guillaume.
>
>
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