Parallel Port Cards (on the cheap!)

If it’s a genuine moschip it’s supported by the Linux kernel. Third party drivers are rarely required for most hardware. It does happen but not that often. Usually exotic hardware and some network items.

The vendor got back to me and (translating) said there is no linux driver for this series. I take that means he wont supply one. Is there one available somewhere I can (probably) use? Thanks in advance...

Like I said if it's a genuine chip no "linux driver" will be required. There will be a driver included with the Linux source. So, unlike windows, there will be no need to install a driver. The only way to know for sure is to have the physical card and install it.
Some times, especially from the "cheaper sources" it is a bit "suck it & see" situation.
The thing is with some the drivers supplied by the seller\vendor\whoever packs the goods, the drivers are for long forgotten superseded kernels, sometimes less useful than a chocolate teacup.
But luckily a good percentage of cards are ok, the only issue as reported by others in the know, is that EPP is not properly supported, which is not an issue if you are using software stepping. Only if you are using an external motion card that communicates via EPP.

Because it has a serial port and a parallel port on the same card, I would keep looking. Some cards emulate parallel over serial which is not suitable for real time stepping.

Last link from aliexpress should work, it has the big MOS chip and has no serial chips ( i did have the same with serials and it is still in use daily, for over 7 years or more).
Again, no guaranties, but it should just work, no drivers needed.

Which cards are they ?