diff --git a/software/code/add.S b/software/code/add.S
index 4822574..3d8582e 100644
--- a/software/code/add.S
+++ b/software/code/add.S
@@ -2,8 +2,8 @@
 .global _start
 
 _start:
-    addi a1, x0, 10      # Carrega o primeiro número (10) em a1
-    addi a2, x0, 20      # Carrega o segundo número (20) em a2
+    addi a1, zero, 10      # Carrega o primeiro número (10) em a1
+    addi a2, zero, 20      # Carrega o segundo número (20) em a2
 
     add a3, a1, a2       # Soma a1 e a2, armazena o resultado em a3
     add a4, a3, a2
diff --git a/software/code/addi.S b/software/code/addi.S
index 94fce25..8c4ee5a 100644
--- a/software/code/addi.S
+++ b/software/code/addi.S
@@ -1,7 +1,7 @@
 .global _start
 
 _start:
-    addi a1, x0, 10      # Carrega o primeiro número (10) em a1
-    addi a2, x0, 20      # Carrega o segundo número (20) em a2
+    addi a1, zero, 10      # Carrega o primeiro número (10) em a1
+    addi a2, zero, 20      # Carrega o segundo número (20) em a2
 
     add a3, a1, a2       # Soma a1 e a2, armazena o resultado em a3
diff --git a/software/code/and.S b/software/code/and.S
index 333f80f..d4d56cc 100644
--- a/software/code/and.S
+++ b/software/code/and.S
@@ -1,8 +1,8 @@
 .global _start
 
 _start:
-    addi x10, x0, 5;
-    addi x11, x0, 3;
+    addi x10, zero, 5;
+    addi x11, zero, 3;
     add x12, x10, x11;
 
     and x9, x10, x10;
diff --git a/software/code/andi.S b/software/code/andi.S
index aaab12a..140796a 100644
--- a/software/code/andi.S
+++ b/software/code/andi.S
@@ -1,7 +1,7 @@
 .global _start
 
 _start:
-    addi x10, x0, 5;
+    addi x10, zero, 5;
 
     andi x9, x10, 5;
     andi x8, x10, 3;
diff --git a/software/code/beq.S b/software/code/beq.S
index 208d8c6..0dede92 100644
--- a/software/code/beq.S
+++ b/software/code/beq.S
@@ -1,22 +1,22 @@
 .global _start
 
 _start:
-    addi x12, x0, 1;
-    addi x9, x0, 1;
+    addi x12, zero, 1;
+    addi x9, zero, 1;
 
     beq x12, x9, desvio;
 
-    addi x13, x0, 5;
+    addi x13, zero, 5;
     add x14, x12, x13;
     sw x14, 0(x12);
     lw x14, 0(x12);
     sub x11, x13, x12;
-    addi x10, x0, 25;
+    addi x10, zero, 25;
     addi x10, x10, -15;
     and x15, x12, x13;
     or x15, x12, x13;
-    addi x10, x0, 100;
+    addi x10, zero, 100;
 
 desvio:
-    addi x16, x0, 17;
+    addi x16, zero, 17;
     andi x16, x16, 17;
diff --git a/software/code/beq2.S b/software/code/beq2.S
index 835f1f6..cc8df36 100644
--- a/software/code/beq2.S
+++ b/software/code/beq2.S
@@ -1,22 +1,22 @@
 .global _start
 
 _start:
-    addi x12, x0, 1;
-    addi x9, x0, 2;
+    addi x12, zero, 1;
+    addi x9, zero, 2;
 
     beq x12, x9, desvio;
 
-    addi x13, x0, 5;
+    addi x13, zero, 5;
     add x14, x12, x13;
     sw x14, 0(x12);
     lw x14, 0(x12);
     sub x11, x13, x12;
-    addi x10, x0, 25;
+    addi x10, zero, 25;
     addi x10, x10, -15;
     and x15, x12, x13;
     or x15, x12, x13;
-    addi x10, x0, 100;
+    addi x10, zero, 100;
 
 desvio:
-    addi x16, x0, 17;
+    addi x16, zero, 17;
     andi x16, x16, 17;
diff --git a/software/code/beq3.S b/software/code/beq3.S
index 6ee43a8..6dc732b 100644
--- a/software/code/beq3.S
+++ b/software/code/beq3.S
@@ -1,13 +1,13 @@
 .global _start
 
 _start:
-    addi x1, x0, 1
-    addi x2, x0, 2
+    addi x1, zero, 1
+    addi x2, zero, 2
 
     beq x1, x1, desvio
 
-    addi x3, x0, 10
+    addi x3, zero, 10
 
 desvio:
-    addi x4, x0, 15
+    addi x4, zero, 15
     add x4, x4, x2
diff --git a/software/code/beq4.S b/software/code/beq4.S
index 080ef13..8104d3e 100644
--- a/software/code/beq4.S
+++ b/software/code/beq4.S
@@ -1,13 +1,13 @@
 .global _start
 
 _start:
-    addi x1, x0, 1
-    addi x2, x0, 2
+    addi x1, zero, 1
+    addi x2, zero, 2
 
     beq x1, x2, desvio
 
-    addi x3, x0, 10
+    addi x3, zero, 10
 
 desvio:
-    addi x4, x0, 15
+    addi x4, zero, 15
     add x4, x4, x2
diff --git a/software/code/bge.S b/software/code/bge.S
index ad566b3..73463d5 100644
--- a/software/code/bge.S
+++ b/software/code/bge.S
@@ -1,13 +1,13 @@
 .global _start
 
 _start:
-    addi x1, x0, 1
-    addi x2, x0, 2
+    addi x1, zero, 1
+    addi x2, zero, 2
 
     bge x1, x2, desvio
 
-    addi x3, x0, 10
+    addi x3, zero, 10
 
 desvio:
-    addi x4, x0, 15
+    addi x4, zero, 15
     add x4, x4, x2
diff --git a/software/code/bge2.S b/software/code/bge2.S
index fca3b90..84c9a6a 100644
--- a/software/code/bge2.S
+++ b/software/code/bge2.S
@@ -1,13 +1,13 @@
 .global _start
 
 _start:
-    addi x1, x0, 1
-    addi x2, x0, 2
+    addi x1, zero, 1
+    addi x2, zero, 2
 
     bge x2, x1, desvio
 
-    addi x3, x0, 10
+    addi x3, zero, 10
 
 desvio:
-    addi x4, x0, 15
+    addi x4, zero, 15
     add x4, x4, x2
diff --git a/software/code/bgeu.S b/software/code/bgeu.S
index ac55727..6b28203 100644
--- a/software/code/bgeu.S
+++ b/software/code/bgeu.S
@@ -1,13 +1,13 @@
 .global _start
 
 _start:
-    addi x1, x0, 1
-    addi x2, x0, 2
+    addi x1, zero, 1
+    addi x2, zero, 2
 
     bgeu x1, x2, desvio
 
-    addi x3, x0, 10
+    addi x3, zero, 10
 
 desvio:
-    addi x4, x0, 15
+    addi x4, zero, 15
     add x4, x4, x2
diff --git a/software/code/bgeu2.S b/software/code/bgeu2.S
index 9e9f23a..222e300 100644
--- a/software/code/bgeu2.S
+++ b/software/code/bgeu2.S
@@ -1,13 +1,13 @@
 .global _start
 
 _start:
-    addi x1, x0, 1
-    addi x2, x0, 2
+    addi x1, zero, 1
+    addi x2, zero, 2
 
     bgeu x2, x1, desvio
 
-    addi x3, x0, 10
+    addi x3, zero, 10
 
 desvio:
-    addi x4, x0, 15
+    addi x4, zero, 15
     add x4, x4, x2
diff --git a/software/code/blt.S b/software/code/blt.S
index ac13320..5720284 100644
--- a/software/code/blt.S
+++ b/software/code/blt.S
@@ -1,13 +1,13 @@
 .global _start
 
 _start:
-    addi x1, x0, 1
-    addi x2, x0, 2
+    addi x1, zero, 1
+    addi x2, zero, 2
 
     blt x1, x2, desvio
 
-    addi x3, x0, 10
+    addi x3, zero, 10
 
 desvio:
-    addi x4, x0, 15
+    addi x4, zero, 15
     add x4, x4, x2
diff --git a/software/code/blt2.S b/software/code/blt2.S
index 69885fe..ca4122a 100644
--- a/software/code/blt2.S
+++ b/software/code/blt2.S
@@ -1,13 +1,13 @@
 .global _start
 
 _start:
-    addi x1, x0, 1
-    addi x2, x0, 2
+    addi x1, zero, 1
+    addi x2, zero, 2
 
     blt x2, x1, desvio
 
-    addi x3, x0, 10
+    addi x3, zero, 10
 
 desvio:
-    addi x4, x0, 15
+    addi x4, zero, 15
     add x4, x4, x2
diff --git a/software/code/bltu.S b/software/code/bltu.S
index 91fcf55..0d83a6a 100644
--- a/software/code/bltu.S
+++ b/software/code/bltu.S
@@ -1,13 +1,13 @@
 .global _start
 
 _start:
-    addi x1, x0, 1
-    addi x2, x0, 2
+    addi x1, zero, 1
+    addi x2, zero, 2
 
     bltu x1, x2, desvio
 
-    addi x3, x0, 10
+    addi x3, zero, 10
 
 desvio:
-    addi x4, x0, 15
+    addi x4, zero, 15
     add x4, x4, x2
diff --git a/software/code/bltu2.S b/software/code/bltu2.S
index 3fa5500..60b964a 100644
--- a/software/code/bltu2.S
+++ b/software/code/bltu2.S
@@ -1,13 +1,13 @@
 .global _start
 
 _start:
-    addi x1, x0, 1
-    addi x2, x0, 2
+    addi x1, zero, 1
+    addi x2, zero, 2
 
     bltu x2, x1, desvio
 
-    addi x3, x0, 10
+    addi x3, zero, 10
 
 desvio:
-    addi x4, x0, 15
+    addi x4, zero, 15
     add x4, x4, x2
diff --git a/software/code/bne.S b/software/code/bne.S
index 056cd2d..16f7c37 100644
--- a/software/code/bne.S
+++ b/software/code/bne.S
@@ -1,13 +1,13 @@
 .global _start
 
 _start:
-    addi x1, x0, 1
-    addi x2, x0, 2
+    addi x1, zero, 1
+    addi x2, zero, 2
 
     bne x2, x1, desvio
 
-    addi x3, x0, 10
+    addi x3, zero, 10
 
 desvio:
-    addi x4, x0, 15
+    addi x4, zero, 15
     add x4, x4, x2
diff --git a/software/code/bne2.S b/software/code/bne2.S
index d02df45..cdd4517 100644
--- a/software/code/bne2.S
+++ b/software/code/bne2.S
@@ -1,13 +1,13 @@
 .global _start
 
 _start:
-    addi x1, x0, 1
-    addi x2, x0, 2
+    addi x1, zero, 1
+    addi x2, zero, 2
 
     bne x1, x1, desvio
 
-    addi x3, x0, 10
+    addi x3, zero, 10
 
 desvio:
-    addi x4, x0, 15
+    addi x4, zero, 15
     add x4, x4, x2
diff --git a/software/code/fpga_test.S b/software/code/fpga_test.S
index b2d8e98..e0728d5 100644
--- a/software/code/fpga_test.S
+++ b/software/code/fpga_test.S
@@ -2,19 +2,19 @@
 .global _start;
 
 _start:
-    addi x2, x0, 2047;
+    addi x2, zero, 2047;
     slli x2, x2, 15;
 
-    addi x15, x0, 9;
+    addi x15, zero, 9;
 
 #    beq x1, x1, loop;
 #
 #loop:
-#    addi x15, x0, 1;
+#    addi x15, zero, 1;
 #
 #    beq x1, x1, time;
 #
 #time:
-#    addi x3, x0, x1;
+#    addi x3, zero, x1;
 #
 #    blt x3, x3, time;
diff --git a/software/code/jal.S b/software/code/jal.S
index c2a7d53..e9370a4 100644
--- a/software/code/jal.S
+++ b/software/code/jal.S
@@ -1,12 +1,12 @@
 .global _start
 
 _start:
-    addi a3, x0, 3;
+    addi a3, zero, 3;
     
     jal subrotina
 
-    addi a4, x0, 5;
+    addi a4, zero, 5;
 
 
 subrotina:
-    addi a5, x0, 10;
+    addi a5, zero, 10;
diff --git a/software/code/jalr.S b/software/code/jalr.S
index a791c3f..6a12fcb 100644
--- a/software/code/jalr.S
+++ b/software/code/jalr.S
@@ -1,15 +1,15 @@
 .global _start
 
 _start:
-    addi a3, x0, 3;
+    addi a3, zero, 3;
     add a3, a3, a3;
     
     la x1, subrotina;
 
     jalr a2, x1, 0;
 
-    addi a4, x0, 7;
+    addi a4, zero, 7;
 
 subrotina:
-    addi a5, x0, 10;
+    addi a5, zero, 10;
     jalr zero, ra, 0;
diff --git a/software/code/jalr2.S b/software/code/jalr2.S
index 33f446a..fbb0aae 100644
--- a/software/code/jalr2.S
+++ b/software/code/jalr2.S
@@ -1,13 +1,13 @@
 .global _start
 
 _start:
-    addi a3, x0, 3;
+    addi a3, zero, 3;
     add a3, a3, a3;
     
     jal ra, subrotina;
 
-    addi a4, x0, 7;
+    addi a4, zero, 7;
 
 subrotina:
-    addi a5, x0, 10;
+    addi a5, zero, 10;
     jalr zero, ra, 0;
diff --git a/software/code/loop.S b/software/code/loop.S
index f19d41d..063a4e2 100644
--- a/software/code/loop.S
+++ b/software/code/loop.S
@@ -1,8 +1,8 @@
 .global _start
 
 _start:
-    addi x2, x0, 10;
-    beq x0, x0, loop;
+    addi x2, zero, 10;
+    beq zero, zero, loop;
 
 loop:
     addi x15, x15, 1;
@@ -12,4 +12,4 @@ loop:
     beq x15, x15, loop;
 
 end:
-    addi x3, x0, 5;
+    addi x3, zero, 5;
diff --git a/software/code/or.S b/software/code/or.S
index 3132d0b..ac138ce 100644
--- a/software/code/or.S
+++ b/software/code/or.S
@@ -1,8 +1,8 @@
 .global _start
 
 _start:
-    addi x10, x0, 5;
-    addi x11, x0, 3;
+    addi x10, zero, 5;
+    addi x11, zero, 3;
     add x12, x10, x11;
 
     or x9, x10, x10;
diff --git a/software/code/ori.S b/software/code/ori.S
index 2838ff6..5c013a6 100644
--- a/software/code/ori.S
+++ b/software/code/ori.S
@@ -1,7 +1,7 @@
 .global _start
 
 _start:
-    addi x10, x0, 5;
+    addi x10, zero, 5;
 
     ori x9, x10, 5;
     ori x8, x10, 3;
diff --git a/software/code/sll.S b/software/code/sll.S
index 1b10a7d..0abfb97 100644
--- a/software/code/sll.S
+++ b/software/code/sll.S
@@ -1,9 +1,9 @@
 .global _start
 
 _start:
-    addi a1, x0, 10      # Carrega o primeiro número (10) em a1
-    addi a2, x0, 20      # Carrega o segundo número (20) em a2
-    addi a3, x0, 1
+    addi a1, zero, 10      # Carrega o primeiro número (10) em a1
+    addi a2, zero, 20      # Carrega o segundo número (20) em a2
+    addi a3, zero, 1
 
     sll a4, a1, a3
     sll a5, a2, a3
diff --git a/software/code/slt.S b/software/code/slt.S
index 7257c51..d308f59 100644
--- a/software/code/slt.S
+++ b/software/code/slt.S
@@ -1,8 +1,8 @@
 .global _start
 
 _start:
-    addi a1, x0, 10      # Carrega o primeiro número (10) em a1
-    addi a2, x0, 20      # Carrega o segundo número (20) em a2
+    addi a1, zero, 10      # Carrega o primeiro número (10) em a1
+    addi a2, zero, 20      # Carrega o segundo número (20) em a2
 
     slt a3, a1, a2
     slt a4, a2, a1
diff --git a/software/code/slti.S b/software/code/slti.S
index 0a740f1..bb8457c 100644
--- a/software/code/slti.S
+++ b/software/code/slti.S
@@ -1,8 +1,8 @@
 .global _start
 
 _start:
-    addi a1, x0, 10      # Carrega o primeiro número (10) em a1
-    addi a2, x0, 20      # Carrega o segundo número (20) em a2
+    addi a1, zero, 10      # Carrega o primeiro número (10) em a1
+    addi a2, zero, 20      # Carrega o segundo número (20) em a2
 
     slti a3, a1, 5
     slti a4, a2, 23
diff --git a/software/code/sltiu.S b/software/code/sltiu.S
index 8a8bb92..6f7b0f6 100644
--- a/software/code/sltiu.S
+++ b/software/code/sltiu.S
@@ -1,8 +1,18 @@
 .global _start
 
 _start:
-    addi a1, x0, 10      # Carrega o primeiro número (10) em a1
-    addi a2, x0, 20      # Carrega o segundo número (20) em a2
+    addi a1, zero, 10      # Carrega o primeiro número (10) em a1
+    addi a2, zero, 20      # Carrega o segundo número (20) em a2
 
-    sltiu a3, a1, 15
-    sltiu a4, a2, 10
+    sltiu a3, a1, 15 # rs1 < imm
+    sltiu a4, a2, 10 # rs2 < imm
+
+    li a5, 0xFFFFFFFF
+    li a6, 0x00000DFF
+    li a0, 0x00000000
+
+    sltiu a7, a5, 00000000 # 0 rs1 < imm
+    sltiu t0, a6, -2048 # 1
+    sltiu t1, a0, 0 # 0
+    sltiu t2, a5, 0 # 0
+    sltiu t3, a0, -2048 # 1 
diff --git a/software/code/sltu.S b/software/code/sltu.S
index e600b11..9007ce2 100644
--- a/software/code/sltu.S
+++ b/software/code/sltu.S
@@ -1,8 +1,18 @@
 .global _start
 
 _start:
-    addi a1, x0, 10      # Carrega o primeiro número (10) em a1
-    addi a2, x0, 20      # Carrega o segundo número (20) em a2
+    addi a1, zero, 10      # Carrega o primeiro número (10) em a1
+    addi a2, zero, 20      # Carrega o segundo número (20) em a2
 
-    sltu a3, a1, a2
-    sltu a4, a2, a1
+    sltu a3, a1, a2 # 1
+    sltu a4, a2, a1 # 0
+
+    li a5, 0xFFFFFFFF
+    li a6, 0xDFFFFFFF
+    li a0, 0x00000000
+
+    sltu a7, a5, a6 # 0 rs1 < rs2
+    sltu t0, a6, a5 # 1
+    sltu t1, a0, a0 # 0
+    sltu t2, a5, a0 # 0
+    sltu t3, a0, a5 # 1 
diff --git a/software/code/sra.S b/software/code/sra.S
index 9654f90..5ab6220 100644
--- a/software/code/sra.S
+++ b/software/code/sra.S
@@ -7,3 +7,10 @@ _start:
 
     sra a3, a1, a5
     sra a4, a2, a5
+
+    li a6, -2;
+
+    sra a7, a6, a5
+
+    li a6, -1000;
+    sra t0, a6, a5
diff --git a/software/code/srl.S b/software/code/srl.S
index 6359446..7488868 100644
--- a/software/code/srl.S
+++ b/software/code/srl.S
@@ -1,9 +1,9 @@
 .global _start
 
 _start:
-    addi a1, x0, 10      # Carrega o primeiro número (10) em a1
-    addi a2, x0, 20      # Carrega o segundo número (20) em a2
-    addi a5, x0, 1
+    addi a1, zero, 10      # Carrega o primeiro número (10) em a1
+    addi a2, zero, 20      # Carrega o segundo número (20) em a2
+    addi a5, zero, 1
 
     srl a3, a1, a5
     srl a4, a2, a5
diff --git a/software/code/sub.S b/software/code/sub.S
index 69bcdac..9f4476f 100644
--- a/software/code/sub.S
+++ b/software/code/sub.S
@@ -1,8 +1,8 @@
 .global _start
 
 _start:
-    addi a1, x0, 10      # Carrega o primeiro número (10) em a1
-    addi a2, x0, 20      # Carrega o segundo número (20) em a2
+    addi a1, zero, 10      # Carrega o primeiro número (10) em a1
+    addi a2, zero, 20      # Carrega o segundo número (20) em a2
 
     sub a3, a2, a1       # Soma a1 e a2, armazena o resultado em a3
     sub a4, a3, a2
diff --git a/software/code/xor.S b/software/code/xor.S
index 68c2a96..e56c9d0 100644
--- a/software/code/xor.S
+++ b/software/code/xor.S
@@ -1,8 +1,8 @@
 .global _start
 
 _start:
-    addi x10, x0, 5;
-    addi x11, x0, 3;
+    addi x10, zero, 5;
+    addi x11, zero, 3;
     add x12, x10, x11;
 
     xor x9, x10, x10;
diff --git a/software/code/xori.S b/software/code/xori.S
index 88cc076..2904af6 100644
--- a/software/code/xori.S
+++ b/software/code/xori.S
@@ -1,8 +1,8 @@
 .global _start
 
 _start:
-    addi x10, x0, 5;
-    addi x11, x0, 3;
+    addi x10, zero, 5;
+    addi x11, zero, 3;
     add x12, x10, x11;
 
     xori x9, x10, 7;
diff --git a/software/memory/sltiu.hex b/software/memory/sltiu.hex
index 3544677..5b5771c 100644
--- a/software/memory/sltiu.hex
+++ b/software/memory/sltiu.hex
@@ -2,3 +2,12 @@
 01400613
 00f5b693
 00a63713
+fff00793
+00001837
+dff80813
+00000513
+0007b893
+80083293
+00053313
+0007b393
+80053e13
diff --git a/software/memory/sltu.hex b/software/memory/sltu.hex
index bdeee74..67315dd 100644
--- a/software/memory/sltu.hex
+++ b/software/memory/sltu.hex
@@ -2,3 +2,12 @@
 01400613
 00c5b6b3
 00b63733
+fff00793
+e0000837
+fff80813
+00000513
+0107b8b3
+00f832b3
+00a53333
+00a7b3b3
+00f53e33
diff --git a/software/memory/sra.hex b/software/memory/sra.hex
index 43cf423..c4946d4 100644
--- a/software/memory/sra.hex
+++ b/software/memory/sra.hex
@@ -3,3 +3,7 @@
 00100793
 40f5d6b3
 40f65733
+ffe00813
+40f858b3
+c1800813
+40f852b3