Question: Using the simulator. executing the instructions:
0x809800
end
ldi @300h,r0 0x809801
br
end

Answer: You need to set the data page to 0 by adding this instruction: 0x809800 ldp 0 0x809801 end ldi @300h,r0 ; read from location dictated by data page and address 0x809802 br end location 650300h. Otherwise it will form the address by placing the value in the data page register (DP) in the top eight bits of the address used by the LDI instruction. For example if data page register has 65h, the LDI instruction will read from location 650300h.