Question: 6.21) Write a subroutine to subtract two numbers (practice: subtract 17FA from 2CB5). In the calling program, the BSA instruction is followed by the subtrahend

6.21) Write a subroutine to subtract two numbers (practice: subtract 17FA from 2CB5). In the calling program, the BSA instruction is followed by the subtrahend and minuend. The difference is returned to the main program in the third location following the BSA instruction.

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