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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