MIPS assembly - random integer range

Hello im trying to use random integer range and the values that开发者_运维知识库 i get is out ouf the ones that i set.

for example:

sw $a0, 0($s0)  
li $a0, 1000
li $a1, 3500
li $v0, 42   #random

So i just want it to be random numbers between 1000-3500 but it gives me any random number.

Can you please help me to understand where my mistake is.

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$a0 is the random seed, not the lower bound. You should set $a1 to 2501 to generate 0-2500 random number, and add 1000 to the result.

sw $a0, 0($s0)  
li $a1, 2501
li $v0, 42   #random
add $a0, $a0, 1000