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The function of LDD, ANDD, ORD instructions are similar to LD, AND, OR; LDDI,
ANDDI, ORDI instructions are similar to LDI, ANDI, ORI; but if the operand is X, the LDD,
ANDD, ORD commands read the signal from the terminals directly.
OUTD and OUT are output instructions. OUTD will output immediately when the condition
is satisfied, needn't wait for the next scan cycle.
3-7. [ORB]