Question 4 a. Using a PIC18F8720 microcontroller, write an assembly program that adds the number stored at 0x15...0x18 with the number stored at Ox25...0x28 and leaves the sum at 0x40...0x43. b. The following programme was written in assembly using a PIC18F4550, analyse the programme by explaining the selected instructions in bold. #include org 0x00 start movf 0x20, W subwf 0x24, W daw movwf 0x30 movf 0x21 subwfb 0x25, W daw movwf 0x31 end c. Based on the programme in Question 4(b), identify the task of the programme.

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Computer Fundamentals

The computer is termed computation. For calculating or computing something the device that has been used is known as the computer. Or we can say that for performing a fast arithmetic operation the device that has been used is a computer. Storing, processing, and retrieving are the main features of a computer.