I'm working on emulating
a phonecard with the PIC16F84. After a long time
trying to beat the metal detector in the Schlumberger
telephone I discover the wafer cards. This dont help
too much because these cards have not internal oscillator
and MCLR of the PIC is conected to R/W pin, which
makes impossible to write a program for the 16F84 to
work. well, I want to ask you if you know if there is a
wafer card with internal oscillator or some suitable card
matching the ISO7816 or any information about this.

Thank you very much and excuse my english!!!