Having had a good play around with this, I'm afraid I still can't help much with the jumpers/switches in case anyone reads this with the same card, as I have no RAM on the card so both my switch blocks are all 'open' (they seem to deal with the RAM start and size). I didn't touch the jumpers as I already had working serial and parallel ports from the card.
I was unable to detect or use the RTC though, but I stumbled upon the Tecmar 'Treasure Chest' which includes a few little utility programs including dostime and settime. I ran these and was able to detect the clock, set the clock and make it update the DOS time/date on each boot from the autoexec.bat.
Tecmar Treasure Chest files attached as a zip.