I recently bought a S1100. It showed 16megawords on startup. I opened it and found that it actually has 4 of the 8MB boards from Mutech. Somehow only two of the boards showed up at start. I expected it was caused by oxidation, so I removed all the memory boards, checked that the dip settings where OK and reseated the RAM cards.
Now only one card works, the Akais show 4 Megawords at startup. I tried rearranging the boards, reseating them, etc. Without luck.