diff --git a/kernel-rs/src/context.rs b/kernel-rs/src/context.rs
index cb61b08f..06ca9bb4 100644
--- a/kernel-rs/src/context.rs
+++ b/kernel-rs/src/context.rs
@@ -2,30 +2,19 @@ extern crate core;
 
 use vga;
 
+pub static mut CONTEXT: Context = Context {
+    current_term: 0,
+    vga1: vga::Writer::new(),
+    vga2: vga::Writer::new(),
+};
 
 pub struct Context {
     pub current_term: u8,
-    pub vga1: vga::Writer<&'static mut [u8]>,
-    pub vga2: vga::Writer<&'static mut [u8]>,
+    pub vga1: vga::Writer,
+    pub vga2: vga::Writer,
 }
 
 impl Context {
-    pub fn new() -> Context {
-        let slice1 = unsafe { 
-            core::slice::from_raw_parts_mut(0xb8000 as *mut u8, 4000)
-        };
-
-        let slice2 = unsafe { 
-            core::slice::from_raw_parts_mut(0xb8000 as *mut u8, 4000)
-        };
-
-        Context {
-            current_term: 0,
-            vga1: vga::Writer::new(slice1),
-            vga2: vga::Writer::new(slice2),
-        }
-    }
-
     pub fn switch_term(&mut self) {
         self.current_term = {
             if self.current_term == 0 { 1 }
@@ -33,7 +22,7 @@ impl Context {
         };
     }
 
-    pub fn current_term(&mut self) -> &mut vga::Writer<&'static mut [u8]>{
+    pub fn current_term(&mut self) -> &mut vga::Writer{
         if self.current_term == 0 {
             &mut self.vga1
         } else {
diff --git a/kernel-rs/src/keyboard.rs b/kernel-rs/src/keyboard.rs
index 20a737c2..834c9ada 100644
--- a/kernel-rs/src/keyboard.rs
+++ b/kernel-rs/src/keyboard.rs
@@ -1,7 +1,7 @@
 extern crate core;
 
 use cpuio;
-use context;
+use context::CONTEXT;
 // use vga::color::{Color, ColorCode};
 
 const MAX_KEYS: usize = 59;
@@ -77,7 +77,7 @@ fn check_key_state(key: u8) -> (bool, usize) {
     }
 }
 
-pub fn kbd_callback(context: &mut context::Context) {
+pub fn kbd_callback() {
     static mut SHIFT: bool = false;
     static mut CTRL: bool = false;
     static mut ALT: bool = false;
@@ -95,28 +95,28 @@ pub fn kbd_callback(context: &mut context::Context) {
                     0x38 => {ALT = !is_release},
                     0x1D => {CTRL = !is_release},
                     0x0F => {
-                context.current_term().keypress('T' as u8);
-                        context.switch_term();
-                context.current_term().keypress('T' as u8);
-                        context.current_term().flush();
-                context.current_term().keypress('T' as u8);
-                context.current_term().keypress('T' as u8);
-                context.current_term().keypress('T' as u8);
+                CONTEXT.current_term().keypress('T' as u8);
+                        CONTEXT.switch_term();
+                CONTEXT.current_term().keypress('T' as u8);
+                        CONTEXT.current_term().flush();
+                CONTEXT.current_term().keypress('T' as u8);
+                CONTEXT.current_term().keypress('T' as u8);
+                CONTEXT.current_term().keypress('T' as u8);
                     },
                     _ => {}
                 }
             },
             // Some(b"2@") if ALT => {
-            //     context.switch_term();
-            //     context.current_term().flush();
+            //     CONTEXT.switch_term();
+            //     CONTEXT.current_term().flush();
             // },
             Some(b"1!") if CTRL => {
-                context.switch_term();
-                context.current_term().keypress('>' as u8);
-                context.current_term().flush();
+                CONTEXT.switch_term();
+                CONTEXT.current_term().keypress('>' as u8);
+                CONTEXT.current_term().flush();
             },
             Some(ascii) if !is_release => {
-                let mut terminal = context.current_term();
+                let mut terminal = CONTEXT.current_term();
                 if SHIFT {
                     terminal.keypress(ascii[1]);
                 }
diff --git a/kernel-rs/src/lib.rs b/kernel-rs/src/lib.rs
index 74432ce1..e85c053b 100644
--- a/kernel-rs/src/lib.rs
+++ b/kernel-rs/src/lib.rs
@@ -53,10 +53,8 @@ pub extern fn kmain() -> ! {
     // WRITER.lock().color_code = ColorCode::new(Color::White, Color::Black);
     // println!(">> Kernel startup...");
 
-    let mut context = context::Context::new();
-
     loop {
-        keyboard::kbd_callback(&mut context);
+        keyboard::kbd_callback();
     }
 }
 
diff --git a/kernel-rs/src/vga/buffer.rs b/kernel-rs/src/vga/buffer.rs
index 7461d9ca..eb946ea9 100644
--- a/kernel-rs/src/vga/buffer.rs
+++ b/kernel-rs/src/vga/buffer.rs
@@ -16,20 +16,41 @@ struct ScreenChar {
     color_code: ColorCode,
 }
 
+// macro_rules! print {
+//     ($($arg:tt)*) => ({
+//             $crate::vga_buffer::print(format_args!($($arg)*));
+//         });
+// }
+
+// macro_rules! println {
+//     ($fmt:expr) => (print!(concat!($fmt, "\n")));
+//     ($fmt:expr, $($arg:tt)*) => (print!(concat!($fmt, "\n"), $($arg)*));
+// }
+
+// pub fn print(args: fmt::Arguments) {
+//     use core::fmt::Write;
+//     context.current_screen().write_fmt(args).unwrap();
+// }
+
+
+extern crate core;
+
+// pub const unsafe fn vga_slice() -> &'static [u8] {
+//     unsafe { core::slice::from_raw_parts_mut(0xb8000 as *mut u8, 4000) }
+// }
+
 const BUFFER_ROWS: usize = 25;
 const BUFFER_COLS: usize = 80 * 2;
 
-pub struct Writer<T: AsMut<[u8]>> {
+pub struct Writer {
     pub position: usize,
     color_code: ColorCode,
-    slice: T,
     buffer: [u8; BUFFER_ROWS * BUFFER_COLS],
 }
 
-impl<T: AsMut<[u8]>> Writer<T> {
-    pub fn new(slice: T) -> Writer<T> {
+impl Writer {
+    pub const fn new() -> Writer {
         Writer {
-            slice,
             position: 0,
             color_code: ColorCode::new(Color::White, Color::Black),
             buffer: [0; BUFFER_ROWS * BUFFER_COLS],
@@ -70,7 +91,8 @@ impl<T: AsMut<[u8]>> Writer<T> {
     }
 
     pub fn flush(&mut self) {
-        self.slice.as_mut().clone_from_slice(&self.buffer);
+        let slice = unsafe { core::slice::from_raw_parts_mut(0xb8000 as *mut u8, 4000) };
+        slice.as_mut().clone_from_slice(&self.buffer);
     }
 
     fn scroll(&mut self) {
@@ -92,7 +114,7 @@ impl<T: AsMut<[u8]>> Writer<T> {
 }
 
 use core::fmt;
-impl<T: AsMut<[u8]>> fmt::Write for Writer<T> {
+impl fmt::Write for Writer {
     fn write_str(&mut self, s: &str) -> ::core::fmt::Result {
         for byte in s.bytes() {
             self.write_byte(byte)