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1. Determine the mode words for each 8255 configuration: (a) Mode 0, A in, B out, C in (b) Mode 1, A out, B in

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1. Determine the mode words for each 8255 configuration: (a) Mode 0, A in, B out, C in (b) Mode 1, A out, B in 2. Show the instruction needed to program the 8251 for: (a) Asynchronous mode, 7data bits, odd parity, X16 clock, 2 stop bits. (b) Synchronous mode, 7 data bits per character. 3. What's the main difference between polled I/O and interrupt-driven I/O? 4. What instructions are needed to program counter 2 in an 8254 for binary counting in mode 0? The initial count is 3000H. Assume the base port address is BOH

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