This article is from the Programming VCOMM FAQ, by email@example.com (Taed Nelson) with numerous contributions by others.
[Contributed by Mike Melo and Michael Grabelkovsky (firstname.lastname@example.org).]
HyperTerm has problems when configured to use "Direct to COMx". The port
driver only receives a single PortSetup call, and TxQueue and cbTxQueue are
It's undocumented, but SERIAL.VXD includes special support for this case. You
can look at the SERFUNC.ASM module, function PortWrite. The code is