Discussion
Match the following lists with correct ones :
| List – I | List – II |
|---|---|
| a. QUE | 1. Z flag not affected |
| b. DX | 2. Slow memory |
| c. DCX D | 3. Reg B |
| d. MUL/DIV | 4. Variable port addressing |
Codes : a b c d
Answer: D
The key gives these matches: QUE with slow memory, so a matches 2; the register DX, which holds the port address in the 8086 input and output instructions, with variable port addressing, so b matches 4; DCX D, which does not affect the zero flag in the 8085, so c matches 1; and MUL and DIV, which in the 8051 use register B, so d matches 3. The code is 2 4 1 3. The codes 4 2 3 1 and 4 2 1 3 start with the wrong match for QUE, and 2 4 3 1 swaps the last two. I could not identify QUE from a standard reference, so the first pair rests on the key. The answer is 2 4 1 3.
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