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Q. Illustrate about Direct Addressing mode?
In this technique operand field of instruction specifies direct address of intended operand for example if instruction LOAD 500 uses direct addressing then it will yield in loading the contents of memory cell 500 in the CPU register. In this mode intended operand is address of the data in operation. E.g. if memory cell 500 comprises 7 as in the figure below then value 7 will be loaded to CPU register.
Figure: Direct Addressing
Q Use as few gates as possible, design a NAND-to-AND gate network that realize the following Boolean algebra expression. ABCD + A'BC'D + A'BC'D' + A'BCD + (A'B'C'D' + A'BCD')
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