This article is from the 3b1 computers FAQ, by John B. Bunch with numerous contributions by others.
In what Convergent considered future releases of the UNIX PC (P6), there was to be a 2400 bps modem. This machine was never fully developed to production levels, and therefore there is no 2400 bps modem. As the existing OBM is a proprietary AT&T chip, the likelihood of there being a drop-in upgrade is remote at best.
Interesting trivia: The P6 machine was to have a color video, 60MB QIC tape, as well as a 68020 CPU paired with a 68881 FPU.
 
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