
     Virtually  every  componenet in a Zoom modem is changed, as  is  board
layout when Rockwell sends us the new ROM for a new modem. Circuitry for  a
2400,  2400  v42bis, or a V32(bis) modem have different  requirements,  for
both  power  &  support components. So there is no  upgrade  path  for  any
Zoom/modem to any other level of modem, with the exception of the  V32(bis)
modem series (it is possible to upgrade a v32 to v32bis [not Turbo modem]).

     Some  Mfrs do make a hi-end modem, then put low-end ROMs in it,  which
then allows an upgrade path. This makes the low-end modem cost more than it
should, and makes the final hi-speed modem cost more too. so Zoom does  not
do this.

                                   Don Hinds - Zoom Tech
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