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Problems using the simulator

I am using a dallas ds80c400 and Keil Cx51. I can download and run my programs on the dallas processor or using the MON390 program. However, I am not able to use the simulator program. When I attempt to use it, it starts my program at address 0 and there is nothing but NOPs. When I use the mon390 program, the program starts at 0, but there is a AJMP that goes to 20A8. I can not put this same command in the simulator because I get error 116: branch target out of range. What am I doing wrong?