Discussion
The control word of ‘0B5H’ of 8253 indicates that the following counter is selected
Answer: C
The control word 0B5H of the 8253 selects counter 2, option (C). In binary 0B5H is 1011 0101. The two most significant bits, D7 D6, select the counter: 00 for counter 0, 01 for counter 1 and 10 for counter 2, and here they are 10. The next two bits, D5 D4 = 11, say that the low byte and then the high byte are read or loaded, the bits D3 D2 D1 = 010 select mode 2, and D0 = 1 selects BCD counting. The code 11 in D7 D6 is not a counter selection in the 8253, so counter 3, option (D), does not exist, and counters 0 and 1 in options (A) and (B) would need 00 and 01.
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