Question: Why does the assembler need to handle the source files in two passes? In the above listing fill up the object code column for line

Why does the assembler need to handle the source files in two passes? In the above listing fill up the object code column for line 1000 and 1003. Why are no object code for line 101C and 1027? Write the object program from the above assembly code. Write down the Symbol table to assemble the above code. Assume OPCode for LDT and LDX are 75 and 05
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