Given the instruction set for MARIE in this chapter:

a) Decipher the following MARIE machine language instructions (write the assembly language equivalent):

i) 0010000000000111

ii) 1001000000001011

iii) 0011000000001001

b) Write the following code segment in MARIE’s assembly language:

if X > 1 then

Y := X + X;

X := 0;

endif;

Y := Y + 1;

c) What are the potential problems (perhaps more than one) with the following assembly language code fragment (implementing a subroutine) written to run on MARIE? The subroutine assumes the parameter to be passed is in the AC and should double this value. The Main part of the program includes a sample call to the subroutine. You can assume this fragment is part of a larger program.