@ralight @jpmens I did this a few years ago https://hackaday.io/project/11772-punched-card-reader-for-rc2014-z80-computer
To be honest, it wasn't very effective. The burn marks around the holes (or failure to cut through) does spoil it.
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RE: Long shot: do I know anybody in Europe who can provide two dozen 12 row, 80 column punch cards, preferably punched with a specific text?