@Gelip
I did step by step exact what you wrote.
Does not work.
On second boot step of XP there is no connection to the PCIe slotcard on the Asrock z370 k6 board, no matter which (now I have 5 different cards) you use for this
Dietmar
PS: Sundos shows D000 & COM1
and an extra test confirm this with
debug
-d 40:0 confirms Com port on COM1 with 00 D0.