This computer science problem involves algorithmic thinking and programming concepts. The solution below explains the approach, logic, and implementation step by step.
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Here are the solutions to the questions from the image: SECTION A: MICROPROCESSOR SYSTEMS (a) Explain the functions of each of the following Intel 8085 microprocessor signals: (i) RESET-IN: This is an active-low input signal. When the RESET-IN pin is held low, the microprocessor resets its Program Counter (PC) to 0000H, clears all internal registers and flags, and restarts program execution from memory location 0000H. (ii) IO/M: This is a status output signal. When this pin is high, it indicates that the CPU is performing an Input/Output (I/O) operation. When it is low, it indicates that the CPU is performing a memory operation. This signal helps external devices distinguish between memory and I/O access. (iii) RD: This is an active-low output signal. When the RD pin is asserted (pulled low), it indicates that the CPU is performing a read operation, meaning it is fetching data from either memory or an I/O device. (b) Complete the table by stating the addressing mode and size in bytes for each instruction. | Instruction | Addressing mode | Size in bytes | | :---------- | :-------------- | :------------ | | LXI H, 20FFH | Immediate | 3 | | ADD M | Register Indirect | 1 | | STAX B | Register Indirect | 1 | | DAA | Implied | 1 | (c) Write an assembly language program to perform each of the following operation: (i) logically AND (10101101)_2 with (01110010)_2; First, convert the binary numbers to hexadecimal: (10101101)_2 = AD_16 (01110010)_2 = 72_16 `assembly MVI A, ADH ; Load the first operand (ADh) into the Accumulator MVI B, 72H ; Load the second operand (72h) into Register B ANA B ; Perform logical AND between Accumulator and Register B. Result is stored in Accumulator. HLT ; Halt the program ` (ii) multiply F2C_16 by 8. Multiplication by 8 is equivalent to three left shifts. In the 8085, a 16-bit left shift can be achieved by adding the 16-bit number to itself (DAD H instruction). `assembly LXI H, 0F2CH ; Load the 16-bit number F2C (0F2CH) into the H-L register pair DAD H ; H-L = H-L + H-L (multiplies by 2) DAD H ; H-L = H-L + H-L (multiplies by 4) DAD H ; H-L = H-L + H-L (multiplies by 8) HLT ; Halt the program. The result (F2C * 8) is in the H-L pair. ` (d) State three Intel 8085 microprocessor software interrupts. 1. RST 0 2. RST 1 3. RST 2 (Other valid answers include RST 3, RST 4, RST 5, RST 6, RST 7) (e) Describe each of the interrupt instructions: (i) SIM (Set Interrupt Mask): This instruction is used to set the interrupt mask for the RST 7.5, RST 6.5, and RST 5.5 hardware