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Sometimes back in 90ties, in Belarus, we had payphones that accepted prepaid payphone cards. I don't remember if you could reload them or you just bought one wi
by hippich 3y ago
Sometimes back in 90ties, in Belarus, we had payphones that accepted prepaid payphone cards. I don't remember if you could reload them or you just bought one with credits already on them, but you certainly could change a few bytes on the card's chip memory to set credits about to any value you wanted. And the hardest part was actually finding contact board that matched chip's contacts layout, to wire it up to LPT port. But otherwise it was "plaintext" value you change in the hex editor.
- pjc50 3y agoThe UK had non-chip phonecards for a while: http://www.telephonecardcollector.com/phonecard-collecting-hobby.htm http://www.telephonecardcollector.com/phonecard-collecting-h... I think they were magnetic or magneto-optical?
- rwmj 3y agoYeah they used a laser to read and burn along a strip in the card. (It was a bit more subtle than I've described it, and you couldn't see the burn mark.)