USING PEP/9
29. Direct addressing is immediate addressing deferred. Indirectaddressing is direct addressing deferred. You can carry thisconcept one level further with double indirect addressing, which isindirect addressing deferred. Implement a new instruction in placeof NOP0 with mnemonic STWADI, which stands for store wordaccumulator double indirect. It should store the accumulator usingdouble indirect addressing. None of the status flags are affected.NOP0 is a unary instruction as far as the assembler and CPU areconcerned, but your program must implement it as a nonunaryinstruction. You will need to increment the saved PC to skip overthe operand specifier. Use the test program provided in
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