# here is a sample program
main:                          # label main all alone
        and     $3 $0 $0;      # clear r3
        lhi     $3 counter;    # get upper address of counter
        rotr    $3 $3 8;       # move it to MSB
        llo     $3 counter;    # lower portion in LSB
        ld      $4 0($3);      # load the initial value into r4
loop:   bz      $4 done;       # test
        or      $2 $3 $3;      # move to arg register
        jr      $1 2($3);      # call dummy
        addi    $3 $3 -1;      # decrement the counter
        st      $4  4($3);
        jmp     loop; 
done:   jmp     done;# stuck here
        llo     $13 258;
        lhi     $13 258;
counter:.data   61;
dummy:  jr      $0 2($1);      # just return
        jmp     foo;
        .data   -3;