Anyone ever tried to run DOS 7.0 on a computer that has 4GB of RAM? It
doesn't seem to like it. Specifically, it seems to create a problem
with XMS.

SMARTDRV won't load, says not enough XMS available, MEM can't tell how
much XMS is being used, WFWG 3.11 won't start, sound card won't
initiate, etc. With only 2 GB of RAM, the problems disapear. I haven't
tried with 3GB yet.

I suspect it has to do with the fact that the graphic card memory
needs to be mapped within 4GB so if there are already 4GB of physical
memory installed, it creates a problem. Is that a reasonable
explanation?