Anyone have any information on this memory expansion board?

I know it has 2 jumpers on it but what exactly do the do? I cant seem to find any info at all, I can find more info on the Tecmar PCjr sidecars and the bigger PC card but zilch on the Wave.

Im guessing the jumpers are for how much memory you have on the board. I was wondering if a board like this can support 256k memory chips like a few other of the Tecmar boards and maybe the jumper(s) are for that.