When I load my program the first instruction is a jump to 0h??(loop) 
I'm not sure how the memory mapping should look.  I'm using a DS390.  When I type "info memory" it lists 5 memory chips, 5 address spaces (all starting at 0h) and 5 address decoders (each with a prepended "0" and appended "activated").
Does this seem to be a valid memory setup?
Any advice would be greatly appreciated,