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Mips read from Keyboard "infinite loop"

I found this code online and I am trying to figure it out so i have a better understanding of how to use the keyboard.

.globl main


addu $s7, $ra, $zero
addi $s0, $0,33
addi $t0, $0, 0
lui $t0, 0xffff


lw $t1, 0($t0)
andi $t1, $t1, 0x0001
beq $t1, $zero, waitloop

lw $a0, 4($t0)
beq $a0,$s0,done
li $v0,1
li $v0,4
la $a0, newline

j waitloop


jr $ra

add $zero, $zero, $zero
add $zero, $zero, $zero

.asciiz" "
li $v0, 10


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