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CLASSES #2, #3: Direct

    010 rr aaaaaaa ; register 'rr' <-- [ ggggg aaaaaaa ]  {  ldd r, addr }
    011 rr aaaaaaa ; register 'rr' --> [ ggggg aaaaaaa ]  {  sto r, addr }

    
    Direct addressing is limitted to registers A, B, C and D.
    The 5-bits string 'ggggg' is the current page number held in register S.
    In the mnemonic, addr represents and offset of 7 bits withing the current page.

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