closing out 16550 UART

Hello,

When Windows programs close out a COM port, they leave the registers (for
COM1 in the following state:

3FAH 1
3F8, 9, B, C, D, E 0FFH

Can anyone tell me how to set the UART to this condition. No, it's not just
a matter of writing to the registers. Just one of the obscurities here is
that for 3FCH the hardware specs state that bits 7, 6, 5 are internally set
to 0.

Reason for the question is that I'm trying to clean up a suite of DOS-based
comms software programs for analysing industrial protocols. At the moment,
after the programs close out W32 programs won't pick up the COM port. I've
done enough investigation to be sure that setting the UART regs as above
will solve the problem. It can obviously be done, because it happens somehow
when aa DOS window is closed. TIA


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