diff --git a/src/io/mod.rs b/src/io/mod.rs
deleted file mode 100644
index 5d359f0..0000000
--- a/src/io/mod.rs
+++ /dev/null
@@ -1,5 +0,0 @@
-pub mod port;
-
-pub const PORT_B: port::Port<port::B> = port::Port::new();
-pub const PORT_C: port::Port<port::C> = port::Port::new();
-pub const PORT_D: port::Port<port::D> = port::Port::new();
diff --git a/src/io/port.rs b/src/io/port.rs
deleted file mode 100644
index 73c8ee0..0000000
--- a/src/io/port.rs
+++ /dev/null
@@ -1,183 +0,0 @@
-use core::prelude::v1::*;
-use core::ptr::{read_volatile, write_volatile};
-use core::marker::PhantomData;
-
-use Bit;
-
-pub trait Information {
-    const DDR: *mut u8;
-    const IO: *mut u8;
-    const PIN: *mut u8;
-}
-
-#[derive(Copy, Clone)]
-pub struct B;
-
-impl Information for B {
-    const DDR: *mut u8 = ::DDRB;
-    const IO: *mut u8 = ::PORTB;
-    const PIN: *mut u8 = ::PINB;
-}
-
-#[derive(Copy, Clone)]
-pub struct C;
-
-impl Information for C {
-    const DDR: *mut u8 = ::DDRC;
-    const IO: *mut u8 = ::PORTC;
-    const PIN: *mut u8 = ::PINC;
-}
-
-#[derive(Copy, Clone)]
-pub struct D;
-
-impl Information for D {
-    const DDR: *mut u8 = ::DDRD;
-    const IO: *mut u8 = ::PORTD;
-    const PIN: *mut u8 = ::PIND;
-}
-
-#[derive(Copy, Clone)]
-enum Direction {
-    Output,
-    Input,
-}
-
-const BITS_IN_BYTE: usize = 8;
-
-pub struct Configuration<P: Information> {
-    _port: PhantomData<P>,
-    direction: [Option<Direction>; BITS_IN_BYTE],
-    pullup: [Option<bool>; BITS_IN_BYTE],
-}
-
-impl<P> Configuration<P>
-    where
-    P: Information
-{
-    #[inline]
-    pub fn new() -> Configuration<P> {
-        Configuration {
-            _port: PhantomData,
-            direction: Default::default(),
-            pullup: Default::default(),
-        }
-    }
-
-    #[inline]
-    pub fn set_all_as_output(&mut self) -> &mut Self {
-        self.direction = [Some(Direction::Output); 8];
-        self
-    }
-
-    #[inline]
-    pub fn set_all_as_input(&mut self) -> &mut Self {
-        self.direction = [Some(Direction::Input); 8];
-        self
-    }
-
-    #[inline]
-    pub fn set_as_output(&mut self, bit: Bit) -> &mut Self {
-        self.direction[bit as usize] = Some(Direction::Output);
-        self
-    }
-
-    #[inline]
-    pub fn set_as_input(&mut self, bit: Bit) -> &mut Self {
-        self.direction[bit as usize] = Some(Direction::Input);
-        self
-    }
-
-    #[inline]
-    pub fn enable_pullup(&mut self, bit: Bit) -> &mut Self {
-        self.pullup[bit as usize] = Some(true);
-        self
-    }
-
-    #[inline]
-    pub fn disable_pullup(&mut self, bit: Bit) -> &mut Self {
-        self.pullup[bit as usize] = Some(false);
-        self
-    }
-
-    #[inline]
-    pub fn configure(&self) {
-        // FIXME: Both of these loops are wasteful if we are
-        // setting all 8 bits, when we could set the entire IO
-        // register at once. Is there a way we can track that?
-
-        // We use `zip` instead of `enumerate` to guarantee it's a constant
-
-        for (&p, i) in self.direction.iter().zip(0..BITS_IN_BYTE) {
-            if let Some(enabled) = p {
-                if let Direction::Output = enabled {
-                    unsafe { asm!("sbi $0 $1" : : "n"(P::DDR), "n"(i)) }
-                } else {
-                    unsafe { asm!("cbi $0 $1; A" : : "n"(P::DDR), "n"(i)) }
-                }
-            }
-        }
-
-        for (&p, i) in self.pullup.iter().zip(0..BITS_IN_BYTE) {
-            if let Some(enabled) = p {
-                if enabled {
-                    unsafe { asm!("sbi $0 $1" : : "n"(P::IO), "n"(i)) }
-                } else {
-                    unsafe { asm!("cbi $0 $1; B" : : "n"(P::IO), "n"(i)) }
-                }
-            }
-        }
-    }
-}
-
-#[derive(Copy, Clone)]
-pub struct Data<P: Information> {
-    _port: PhantomData<P>,
-}
-
-impl<P> Data<P>
-    where
-    P: Information
-{
-    #[inline]
-    pub fn new() -> Data<P> { Data { _port: PhantomData } }
-
-    #[inline]
-    pub fn get(&self) -> u8 {
-        unsafe { read_volatile(P::PIN) }
-    }
-
-    #[inline]
-    pub fn set(&self, value: u8) {
-        unsafe { write_volatile(P::IO, value) };
-    }
-
-    #[inline]
-    pub fn bit_is_set(&self, bit: Bit) -> bool {
-        bit.is_set(self.get())
-    }
-
-    #[inline]
-    pub fn set_bit(&self, bit: Bit) {
-        unsafe { asm!("sbi $0 $1" : : "n"(P::IO), "n"(bit as u8)) }
-    }
-
-    #[inline]
-    pub fn clear_bit(&self, bit: Bit) {
-        unsafe { asm!("cbi $0 $1; C" : : "n"(P::IO), "n"(bit as u8)) }
-    }
-
-    #[inline]
-    pub fn toggle_bit(&self, bit: Bit) {
-        unsafe { asm!("sbi $0 $1" : : "n"(P::PIN), "n"(bit as u8)) }
-    }
-}
-
-#[derive(Copy, Clone)]
-pub struct Port<P>(PhantomData<P>);
-
-impl<P: Information> Port<P> {
-    pub(crate) const fn new() -> Port<P> { Port(PhantomData) }
-    pub fn configuration(&self) -> Configuration<P> { Configuration::new() }
-    pub fn data(&self) -> Data<P> { Data::new() }
-}
diff --git a/src/lib.rs b/src/lib.rs
index b4e5948..08a1c3f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -8,43 +8,10 @@
 
 extern crate core;
 
-// Look like we have a standard library
-#[allow(unused_imports)]
-use core::{option, iter, fmt, ops, clone, marker};
-
 pub mod prelude;
 pub mod timer0;
 pub mod timer1;
 pub mod serial;
-pub mod io;
-
-#[derive(Copy, Clone)]
-pub enum Bit {
-    Bit0 = 0,
-    Bit1 = 1,
-    Bit2 = 2,
-    Bit3 = 3,
-    Bit4 = 4,
-    Bit5 = 5,
-    Bit6 = 6,
-    Bit7 = 7,
-}
-
-impl Bit {
-    fn as_mask(&self) -> u8 { 1 << *self as u8 }
-
-    pub fn is_set(&self, value: u8) -> bool {
-        (value & self.as_mask()) != 0
-    }
-
-    pub fn set(&self, value: u8) -> u8 {
-        value | self.as_mask()
-    }
-
-    pub fn unset(&self, value: u8) -> u8 {
-        value & !self.as_mask()
-    }
-}
 
 macro_rules! bit {
     (-, $pos:expr) => {};
diff --git a/src/prelude.rs b/src/prelude.rs
index 8592448..8895d93 100644
--- a/src/prelude.rs
+++ b/src/prelude.rs
@@ -1,8 +1,6 @@
 use core::prelude::v1::*;
 use core::marker::PhantomData;
 
-pub use io::{PORT_B, PORT_C, PORT_D};
-
 pub struct DisableInterrupts(PhantomData<()>);
 
 impl DisableInterrupts {