Building the Loop

Perhaps you added one to the base register, rather than four. The base register $9 needs to be increased by the size of a full word, four. Now work on getting the loop correct. The beq instruction branches out of the loop if the count has reached the end of the array.

## Registers:
## $8 --- count                       $12 -- sum of negative integers
## $9 --- pointer to the array entry  $13 -- sum of positive integers
## $10 -- current array entry         $14 -- pos. or neg. flag
## $11 -- sum of all integers         $15 -- SIZE of the array

main:    ori      $8,$0,0        #  count = 0
         ori      $11,$0,0       #  sum = 0
         ori      $12,$0,0       #  neg = 0
         ori      $13,$0,0       #  pos = 0
         lui      $9,0x1000      #  point at SIZE

         lw       $15,0($9)      #  get SIZE
         addiu    $9,$9,4        #  point to first array entry

# while  count < SIZE do
loop:    beq      $____,$____,done 
         sll      $0,$0,0        #  branch delay


         addiu    $8,$8,____     # count++
         addiu    $9,$9,____     # point at next entry
         j        loop
         sll      $0,$0,0        #  branch delay

done:    sll      $0,$0,0        #  target for branch

        .data
size:   .word  17
array:  .word  12, -1, 8, 0, 6, 85, -74, 23, 99, -30, 30, 95, 4, 7, 10, 28, 14

At the bottom of the loop, the count is incremented and the base register is move to the next array entry.