I found an old smart card test card with PIC16C84 and a memory chip.
Depending on the software put to PIC it could have maybe emulated telephone booth calling card, SIM card, satellite TV smartcard, cable TV smartcard or something else.
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1 Comment
Tomi Engdahl says:
https://www.epanorama.net/blog/2024/01/14/telephone-cards-hacking-history/