It's one of those things that was never very popular because few people needed more than one serial port on a laptop and these days serial ports are pretty much dead for most people. You might be best off getting one from ebay, I've never even seen one up close and I've got a lot of random computer bits.
When somebody suggested few had ever been interested in a PCMIA serial port, my reaction was that likely people did add things that bypassed the need for a serial port. Your suggestion reinforces that, since likely people would be more interested in adding a modem than just a serial port.
On the other hand, it may be that the vintage is too late. Ten years ago, I took an ISA 2400Baud modem and yanked the UART, adding some line drivers and receivers so I had a 2400 Baud serial modem to use with my Mac.
I would have duplicated the process with a faster modem later, but by then there was no standalone UART. It was part of some LSI IC, and there was no way of accessing the needed points.
At least one of the applications is genuinely Windows compatible. :)
The other is a terminal emulator and while I'm currently using an ancient copy of Procomm Plus, and terminal emulator that has certain terminal types included in its database will be fine. But since COM1 can be the built in port, that really doesn't matter.
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