diff --git a/src/core/gba.rs b/src/core/gba.rs
index fd4d51f..409d023 100644
--- a/src/core/gba.rs
+++ b/src/core/gba.rs
@@ -5,7 +5,7 @@ use std::rc::Rc;
 use bincode;
 use serde::{Deserialize, Serialize};
 
-use super::arm7tdmi::Core;
+use super::arm7tdmi;
 use super::cartridge::Cartridge;
 use super::gpu::*;
 use super::interrupt::*;
@@ -17,7 +17,7 @@ use super::super::{AudioInterface, InputInterface, VideoInterface};
 
 pub struct GameBoyAdvance {
     pub sysbus: Box<SysBus>,
-    pub cpu: Core,
+    pub cpu: arm7tdmi::Core,
 
     video_device: Rc<RefCell<dyn VideoInterface>>,
     audio_device: Rc<RefCell<dyn AudioInterface>>,
@@ -29,12 +29,11 @@ pub struct GameBoyAdvance {
 #[derive(Serialize, Deserialize)]
 struct SaveState {
     sysbus: Box<SysBus>,
-    cpu: Core,
+    cpu: arm7tdmi::Core,
 }
 
 impl GameBoyAdvance {
     pub fn new(
-        cpu: Core,
         bios_rom: Vec<u8>,
         gamepak: Cartridge,
         video_device: Rc<RefCell<dyn VideoInterface>>,
@@ -46,9 +45,12 @@ impl GameBoyAdvance {
             audio_device.borrow().get_sample_rate() as f32,
         ));
         let io = IoDevices::new(gpu, sound_controller);
+        let sysbus = Box::new(SysBus::new(io, bios_rom, gamepak));
+        let cpu = arm7tdmi::Core::new();
+
         GameBoyAdvance {
             cpu: cpu,
-            sysbus: Box::new(SysBus::new(io, bios_rom, gamepak)),
+            sysbus: sysbus,
 
             video_device: video_device,
             audio_device: audio_device,
@@ -206,7 +208,6 @@ mod tests {
 
     fn make_mock_gba(rom: &[u8]) -> GameBoyAdvance {
         let bios = vec![0; 0x4000];
-        let cpu = arm7tdmi::Core::new();
         let cartridge = GamepakBuilder::new()
             .buffer(rom)
             .with_sram()
@@ -215,7 +216,6 @@ mod tests {
             .unwrap();
         let dummy = Rc::new(RefCell::new(DummyInterface::new()));
         let mut gba = GameBoyAdvance::new(
-            cpu,
             bios,
             cartridge,
             dummy.clone(),
diff --git a/src/plat/minifb/main.rs b/src/plat/minifb/main.rs
index 8e72076..6152734 100644
--- a/src/plat/minifb/main.rs
+++ b/src/plat/minifb/main.rs
@@ -91,11 +91,6 @@ fn main() {
 
     let bios_bin = read_bin_file(bios_path).unwrap();
     let cart = GamepakBuilder::new().file(rom_path).build().unwrap();
-    let mut cpu = arm7tdmi::Core::new();
-    if skip_bios {
-        cpu.skip_bios();
-    }
-    let cpu = cpu;
 
     let minifb = Rc::new(RefCell::new(MiniFb {
         window: Window::new(
@@ -113,7 +108,6 @@ fn main() {
 
     let mut fps_counter = FpsCounter::default();
     let mut gba = GameBoyAdvance::new(
-        cpu,
         bios_bin,
         cart,
         minifb.clone(),
@@ -121,6 +115,10 @@ fn main() {
         minifb.clone(),
     );
 
+    if skip_bios {
+        gba.skip_bios();
+    }
+
     let frame_time = time::Duration::new(0, 1_000_000_000u32 / 60);
     loop {
         let start_time = time::Instant::now();
diff --git a/src/plat/sdl2/main.rs b/src/plat/sdl2/main.rs
index 1f94153..22bb6bc 100644
--- a/src/plat/sdl2/main.rs
+++ b/src/plat/sdl2/main.rs
@@ -135,7 +135,6 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         .build()?;
 
     let mut gba = GameBoyAdvance::new(
-        arm7tdmi::Core::new(),
         bios_bin,
         gamepak,
         video.clone(),
@@ -243,7 +242,6 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
                     // create a new emulator - TODO, export to a function
                     gba = GameBoyAdvance::new(
-                        arm7tdmi::Core::new(),
                         bios_bin,
                         gamepak,
                         video.clone(),