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A comment on Replacement PCB Replicates Early 80s Modem. Parent comment

Re:Replacement PCB Replicates Early 80s Modem by foldr on Thursday February 22, 2024 @09:18AM (#39467388)
Phone lines operate at way above 5V, so you'd need some level shifting at least.
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Re:Replacement PCB Replicates Early 80s Modem by mtve on Thursday February 22, 2024 @01:46PM (#39471299)
9V battery was enough for two modems to communicate back-to-back, without dial tone or ringing signals, just "ATD" command on one and "ATA" on another.
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