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Re: filmscanners: Importance of Copyright on Images



Tom writes:

> There were not 2400 baud modems in 1971.

The Bell System leased Dataphone modems with speeds up to 2400 bps from the
early 1960s, almost a decade earlier, if my distant memory serves.  I found a
reference to Multics systems using such modems, presumably in that decade.  So
there were 2400-bps modems by 1971, although they were not common, and they
certainly were not cheap.

Not everyone used acoustic couplers (which cannot support speeds above 300 bps,
as far as I know).  Modems had to be hardwired to subscriber lines to support
higher speeds (Bell would not allow modular plug-in modems, so this was a
political restriction, not a technical one).






 




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