To call your subroutine, you might use a program like this:
CLA OSR DCA A HLT CLA OSR DCA A+1 TAD ADDR_A JMS MULT A, 0000 0000 ADDR_A, Awhere A is the address of the first factor and MULT is the address of your subroutine.
For more details, come to class on 9/18.
Hand in your two modified source files, measurements of the performances of the three programs, and your interpretation of your data.