SCAM Documentation

Tim TimeWaster <tim@cuba.xs4all.nl>

Bugs

There are still a few bugs ("bug" is such an ugly word, these are not bugs, but things that still have to be implemented) in SCAM.

The serial device works with termios.h only. A fix is to make an interface class that uses SIO, but this will require some changes in the Makefile. You can then compile SCAM with -DUSE_SIO.
The ISO 7816-3 layer in RASCaL has to filter output from readers that is not card output. Now it will only work with dumb readers such as the Dumb Mouse.
The T=1 protocol layer needs a bit of redesign and a complete implementation. It is not possible to send chained blocks and S-blocks are not implemented. The error detection and correction also needs to be implemented. But what we have now is adequate to hobby with.
We need a T=0 reader as well. Note that the T=0 protocol can not fully be implemented on dumb readers: if there is a parity error for a byte, the IFD has to lower a certain line within some etu to request for a retransmission of the byte. Unless the serial device takes care of this, together with the reader's circuit, this cannot be implemented in software, as it is too slow.
There needs to be code to parse an ATR and get all the communication parameters from it. There is code in stest that does this, but IMHO it has a few minor bugs.

It is impossible to use quoted talk mode.
The readers do not give an error if no card is present.
The software readers do not share certain code, such as the mechanisms to select a physical reader.
To add a reader you need to change the code in two or three places.
There are some obsolete functions which I forgot to clean up.