The problem looks to be when the user input is stored in the array. With the error "address error in store" after every input. "Exception occurred at PC=0x0040008c" and "Unaligned address in store: 0x10010043." I believe that the problem has to do with "sw $v0,array($t0)"
ISSUE: .space isn't implicitly word aligned, so when writing words to it you must take care to not misalign it in its declaration inside the .data segment. In my case, .space was misaligned by the prompts.
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.text
main:
la $a0,prompt1
li $v0,4
syscall
li $t4,4
li $t0,0
store:
#check if 20 == input;
beq $t6,20,display
#print the 2nd prompt
la $a0, prompt2
li $v0,4
syscall
#take in user input
li $v0, 5
syscall
#check for sentinal value
beq $v0,-1,display
#store user input into array
sw $v0,array($t0)
#add 4 to the index
add $t0,4
j store
display:
beq $t0,0,load
lw $t1,array($t2)
li $v0,1
move $a0,$t1
syscall
add $t2,4
add $t0,-4
j display
load:
la $t4,array
li $v0,10
syscall
.data
prompt1: .asciiz "Enter 5 numbers into an array (or quit -1)\n"
prompt2: .asciiz "Enter a number : "
array: .space 20
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