The Microcoupler is just the phone line interface, of a two part
modem. That same coupler was used on the S-100 board version modem
and the Apple II board modem. Seems to me the telephone company
required a separate DAA (data acquisition something_or_other?)
to interface to ''their'' phone lines. Remember all that crap
about we couldn't just hook things up - we might ''damage''
telephone company property? Turns out all we really damaged was
their profits!
Bill Hemmings
Tucson, AZ