diff --git a/include/PSX/System/IOPorts/ioport.hpp b/include/PSX/System/IOPorts/ioport.hpp
index 7253482d..d6d95578 100644
--- a/include/PSX/System/IOPorts/ioport.hpp
+++ b/include/PSX/System/IOPorts/ioport.hpp
@@ -60,25 +60,31 @@ namespace JabyEngine {
     #define __declare_io_type(name, type, ...) \
         template<template<typename> typename T> \
         struct name##_io_base { \
-            T<type>::Value raw_value; \
+            T<type>::Value raw_value = 0; \
             \
-            name##_io_base(type value) : raw_value(value) {} \
+            constexpr name##_io_base() = default; \
+            \
+            constexpr name##_io_base(type value) : raw_value(value) {} \
             __VA_ARGS__ \
             \
-            void set(IOBitSet bit) { \
+            constexpr name##_io_base& set(IOBitSet bit) { \
                 this->raw_value = bit::set(this->raw_value, bit.pos); \
+                return *this; \
             } \
             \
-            void set(IOBitUnset bit) { \
+            constexpr name##_io_base& set(IOBitUnset bit) { \
                 this->raw_value = bit::clear(this->raw_value, bit.pos); \
+                return *this; \
             } \
             \
-            void set(IOValueSet bits, type value) { \
+            constexpr name##_io_base& set(IOValueSet bits, type value) { \
                 this->raw_value = bit::value::set_normalized(this->raw_value, value, bits.pos, bits.length); \
+                return *this; \
             } \
             \
-            void set(const IOValueSet::IOValueSetPair<type>& value) { \
+            constexpr name##_io_base& set(const IOValueSet::IOValueSetPair<type>& value) { \
                 this->set(value.first, value.second); \
+                return *this; \
             } \
             \
             type get(IOValueSet bits) const { \
@@ -86,8 +92,9 @@ namespace JabyEngine {
             } \
             \
             \
-            void clear(IOBitSet bit) { \
+            constexpr name##_io_base& clear(IOBitSet bit) { \
                 this->raw_value = bit::clear(this->raw_value, bit.pos); \
+                return *this; \
             } \
             \
             \