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A comment on Show HN: I made a tool to communicate data using the PC speaker. Parent comment

Re:Show HN: I made a tool to communicate data using the PC s... by fogihujy on Thursday April 22, 2021 @04:11AM (#26900142)
Also, packet radio, and semi-related, the good old IrDA ports in computers and PDA's in the late 90's/early 00's.
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