Hi, could anyone help, I have a sega netdimm with 256mb memory all works , if I run the dimm test it says all slots good even though only one slot is populated. I have been trying to upgrade to 512mb if I add another 256 it says all good in test then when I load a game it says not enough memory, so I tried a 512 stick in slot 0 it says bad slot 1 and good in slot 0 but when I try to load a game it says board not recognized I have tried multiple configurations changing slots etc to no avail. I noticed jumpers on the ram board do they need to be set for 512 if so which ones and how, its driving me nuts. It will work if I put in the original 256 stick and only in slot 0 if I move it to slot 1 it says not enough memory. (May got slot one and zero backwords but you get the idea)