I finally got a chance to play around with OS/2 a bit this weekend
(I'm using 2.1).  After updating the DOS window settings as shown
below, {COMMO} performed flawlessly with a 14400 modem (I don't have
the SIO drivers installed, but my modem has a 16550).
                                - Fred -
Suggested settings for OS/2 DOS session:
        COM_DIRECT_ACCESS       On
        COM_HOLD                On
        HW_TIMER                On
        IDLE_SECONDS            60
        IDLE_SENSITIVITY        100     Very Important!!
        INT_DURING_IO           On
---
 * SLMR 2.1a #359 *                                     
--- WILDMAIL!/WC v4.12 
---------------