diff --git a/14display_diff_digit.asm b/14display_diff_digit.asm
new file mode 100644
index 0000000..b6aab65
--- /dev/null
+++ b/14display_diff_digit.asm
@@ -0,0 +1,21 @@
+    lui     $s0,        0x4000
+    addi    $s0,        $s0,            0x10
+main_loop:
+    addi    $s1,        $zero,          0x15b
+    sw      $s1,        0($s0)
+    # wait
+    lui     $t0,        0xff
+    addi    $t0,        $t0,            0xffff
+wait_loop_1:
+    addi    $t0,        $t0,            -1
+    bgtz    $t0,        wait_loop_1
+
+    addi    $s1,        $zero,          0x177
+    sw      $s1,        0($s0)
+
+    lui     $t0,        0xff
+    addi    $t0,        $t0,            0xffff
+wait_loop_2:
+    addi    $t0,        $t0,            -1
+    bgtz    $t0,        wait_loop_2
+    j       main_loop
\ No newline at end of file
diff --git a/14display_diff_digit.txt b/14display_diff_digit.txt
new file mode 100644
index 0000000..469c678
--- /dev/null
+++ b/14display_diff_digit.txt
@@ -0,0 +1,19 @@
+20'd0: instruction <= 32'h3c104000;
+20'd1: instruction <= 32'h22100010;
+20'd2: instruction <= 32'h2011015b;
+20'd3: instruction <= 32'hae110000;
+20'd4: instruction <= 32'h3c0800ff;
+20'd5: instruction <= 32'h3c010000;
+20'd6: instruction <= 32'h3421ffff;
+20'd7: instruction <= 32'h01014020;
+20'd8: instruction <= 32'h2108ffff;
+20'd9: instruction <= 32'h1d00fffe;
+20'd10: instruction <= 32'h20110177;
+20'd11: instruction <= 32'hae110000;
+20'd12: instruction <= 32'h3c0800ff;
+20'd13: instruction <= 32'h3c010000;
+20'd14: instruction <= 32'h3421ffff;
+20'd15: instruction <= 32'h01014020;
+20'd16: instruction <= 32'h2108ffff;
+20'd17: instruction <= 32'h1d00fffe;
+20'd18: instruction <= 32'h08000002;
diff --git a/14display_diff_digit_mars.txt b/14display_diff_digit_mars.txt
new file mode 100644
index 0000000..b769707
--- /dev/null
+++ b/14display_diff_digit_mars.txt
@@ -0,0 +1,19 @@
+3c104000
+22100010
+2011015b
+ae110000
+3c0800ff
+3c010000
+3421ffff
+01014020
+2108ffff
+1d00fffe
+20110177
+ae110000
+3c0800ff
+3c010000
+3421ffff
+01014020
+2108ffff
+1d00fffe
+08000002