Question

Problem 1 Write a find subroutine that can locate a specified 8-bit quantity in a null-terminated string 8-bit quantities. (Remember that null terminated means "it ends with zero"). The subroutine is passed two parameters. The pointer to the array is passed in array X, the value to be found is passed in ACCA. The function should return the index of the first occurrence of the value in ACCB, or -1 (0xFF) if the value is not found. a) Write the subroutine. Write a code snippet to call your new function, demonstrating its operation. b) Problem 2 Write a subroutine to add up the contents of an array of 8-bit quantities. Assume the subroutine is passed two parameters, a pointer P and an eight-bit number N, so the stack looks like this when the subroutine is called: RA high RA low Top of Stack P high P low Remember that the sum of these numbers will require 16 bits to hold. Write the subroutine so the 16-bit sum returns in the D register. Don't worry about arithmetic overflow in the sum. Write a code snippet to call your new function. Make sure you clean up the stack before use. a) b)

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