I want to connect and use my ancient but beloved hardware modems via an RS232 to USB connection. 

I have dodged this question for years by installing PCIe to RS232 adapters that were 16550 UART compatible. These adapters go slow enough to transfer 45/75 baud.

Modern FTDI USB/RS232 adapters won't go below 300 baud. And I'm running into needing to connect to Win10/Win11 PCs that don't have available PCI slots. (Progress...)

I know old Edgeport adapters might be the answer. If I can find one and the available drivers behave on Win11 maybe that will work... but are there any other alternatives I'm missing?

Thanks & 73 jeff wk6i