diff --git a/sw/bios/boot2.s b/sw/bios/boot2.s
index 7f8a0cd..6fd2cce 100644
--- a/sw/bios/boot2.s
+++ b/sw/bios/boot2.s
@@ -263,7 +263,6 @@ _start:
         clc
         adc olen
         dec
-        dec
         pha
         bra @opt_len
 
diff --git a/sw/script/o65dump.py b/sw/script/o65dump.py
index 4318bb8..91f6b40 100755
--- a/sw/script/o65dump.py
+++ b/sw/script/o65dump.py
@@ -88,10 +88,14 @@ def main() -> None:
     print(filename)
     o65 = O65(filename)
     for item, value in o65.header.items():
-        print(f"{item}:\t{value:x}")
+        print(f"{item}:\t{value:#x}")
     
+    total_olen = 0
     for option in o65.options:
-        print(f"Type: {option[1]}, Data: {option[2]}")
+        print(f"Length: {option[0]:#x} Type: {option[1]:#x}, Data: {option[2]}")
+        total_olen += option[0]
+
+    print(f"Total option length: {total_olen:#x}")
 
     print(f"Text size: {len(o65.text)}")
     print(f"Data size: {len(o65.data)}")