diff --git a/Cargo.lock b/Cargo.lock
index 13db5ac..dc4cf18 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -12,6 +12,13 @@ dependencies = [
  "regex",
 ]
 
+[[package]]
+name = "abi"
+version = "0.1.0"
+dependencies = [
+ "shared",
+]
+
 [[package]]
 name = "aho-corasick"
 version = "1.1.3"
@@ -192,6 +199,10 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
+[[package]]
+name = "calculator"
+version = "0.1.0"
+
 [[package]]
 name = "cfg-if"
 version = "1.0.1"
@@ -1159,9 +1170,9 @@ checksum = "1171693293099992e19cddea4e8b849964e9846f4acee11b3948bcc337be8776"
 
 [[package]]
 name = "libredox"
-version = "0.1.4"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1580801010e535496706ba011c15f8532df6b42297d2e471fec38ceadd8c0638"
+checksum = "4488594b9328dee448adb906d8b126d9b7deb7cf5c22161ee591610bb1be83c0"
 dependencies = [
  "bitflags 2.9.1",
  "libc",
@@ -1356,6 +1367,7 @@ checksum = "5be167a7af36ee22fe3115051bc51f6e6c7054c9348e28deb4f49bd6f705a315"
 name = "picocalc-os-rs"
 version = "0.1.0"
 dependencies = [
+ "abi",
  "bitflags 2.9.1",
  "bt-hci",
  "cortex-m",
@@ -1378,6 +1390,7 @@ dependencies = [
  "heapless",
  "panic-probe",
  "portable-atomic",
+ "shared",
  "spin",
  "st7365p-lcd",
  "static_cell",
@@ -1726,6 +1739,14 @@ dependencies = [
  "keccak",
 ]
 
+[[package]]
+name = "shared"
+version = "0.1.0"
+dependencies = [
+ "bitflags 2.9.1",
+ "defmt 1.0.1",
+]
+
 [[package]]
 name = "siphasher"
 version = "1.0.1"
diff --git a/Cargo.toml b/Cargo.toml
index 6477884..e58fa93 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,6 @@
-[package]
-name = "picocalc-os-rs"
-version = "0.1.0"
-edition = "2024"
+[workspace]
+resolver = "3"
+members = ["kernel", "abi", "shared", "user-apps/calculator"]
 
 [profile.release]
 debug = 2
@@ -9,72 +8,3 @@ debug = 2
 [profile.dev]
 lto = true
 opt-level = "z"
-
-[features]
-default = ["rp235x", "defmt"]
-rp2040 = ["embassy-rp/rp2040"]
-rp235x = ["embassy-rp/rp235xb"]
-trouble = ["dep:bt-hci", "dep:cyw43", "dep:cyw43-pio", "dep:trouble-host"]
-defmt = [
-  "dep:defmt",
-  "panic-probe/print-defmt",
-  "embassy-executor/defmt",
-  "embassy-time/defmt",
-  "embassy-time/defmt-timestamp-uptime",
-  "embassy-rp/defmt",
-  "embassy-sync/defmt",
-  "embedded-graphics/defmt",
-  "embedded-sdmmc/defmt-log",
-  # "bt-hci/defmt",
-  # "cyw43/defmt",
-  # "cyw43-pio/defmt",
-]
-
-[dependencies]
-embassy-executor = { version = "0.7", features = [
-  "arch-cortex-m",
-  "executor-interrupt",
-  "executor-thread",
-  "nightly",
-] }
-embassy-rp = { version = "0.4.0", features = [
-  "critical-section-impl",
-  "unstable-pac",
-  "time-driver",
-  "binary-info",
-] }
-embassy-futures = "0.1.1"
-embassy-time = "0.4.0"
-embassy-embedded-hal = "0.3.0"
-embassy-sync = { version = "0.7" }
-trouble-host = { version = "0.1", features = [
-  "derive",
-  "scan",
-], optional = true }
-bt-hci = { version = "0.2", default-features = false, optional = true }
-cyw43 = { version = "0.3.0", features = [
-  "firmware-logs",
-  "bluetooth",
-], optional = true }
-cyw43-pio = { version = "0.3.0", optional = true }
-
-embedded-hal-bus = { version = "0.3.0", features = ["async"] }
-embedded-hal = "0.2.7"
-embedded-hal-async = "1.0.0"
-cortex-m = { version = "0.7.7" }
-cortex-m-rt = "0.7.5"
-panic-probe = "0.3"
-portable-atomic = { version = "1.11", features = ["critical-section"] }
-
-defmt = { version = "0.3", optional = true }
-defmt-rtt = "0.4.2"
-
-embedded-graphics = { version = "0.8.1" }
-embedded-sdmmc = { git = "https://github.com/Be-ing/embedded-sdmmc-rs", branch = "bisync", default-features = false }
-st7365p-lcd = { git = "https://github.com/legitcamper/st7365p-lcd-rs", branch = "async" }
-
-static_cell = "2.1.1"
-bitflags = "2.9.1"
-talc = "4.4.3"
-spin = "0.10.0"
-heapless = "0.8.0"
diff --git a/abi/Cargo.toml b/abi/Cargo.toml
new file mode 100644
index 0000000..80cc90d
--- /dev/null
+++ b/abi/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "abi"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+shared = { path = "../shared" }
diff --git a/abi/src/lib.rs b/abi/src/lib.rs
new file mode 100644
index 0000000..0411192
--- /dev/null
+++ b/abi/src/lib.rs
@@ -0,0 +1,9 @@
+#![no_std]
+
+use core::ffi::c_void;
+use shared::keyboard::{KeyCode, KeyEvent, KeyState, Modifiers};
+
+#[repr(C)]
+pub enum Syscall {
+    DrawPixels { x: u32, y: u32, color: u32 },
+}
diff --git a/kernel/Cargo.toml b/kernel/Cargo.toml
new file mode 100644
index 0000000..61fe107
--- /dev/null
+++ b/kernel/Cargo.toml
@@ -0,0 +1,83 @@
+[package]
+name = "picocalc-os-rs"
+version = "0.1.0"
+edition = "2024"
+
+[[bin]]
+name = "picocalc-os-rs"
+path = "src/main.rs"
+test = false
+doctest = false
+bench = false
+
+[features]
+default = ["rp235x", "defmt"]
+rp2040 = ["embassy-rp/rp2040"]
+rp235x = ["embassy-rp/rp235xb"]
+trouble = ["dep:bt-hci", "dep:cyw43", "dep:cyw43-pio", "dep:trouble-host"]
+defmt = [
+  "dep:defmt",
+  "panic-probe/print-defmt",
+  "embassy-executor/defmt",
+  "embassy-time/defmt",
+  "embassy-time/defmt-timestamp-uptime",
+  "embassy-rp/defmt",
+  "embassy-sync/defmt",
+  "embedded-graphics/defmt",
+  "embedded-sdmmc/defmt-log",
+  # "bt-hci/defmt",
+  # "cyw43/defmt",
+  # "cyw43-pio/defmt",
+]
+
+[dependencies]
+embassy-executor = { version = "0.7", features = [
+  "arch-cortex-m",
+  "executor-interrupt",
+  "executor-thread",
+  "nightly",
+] }
+embassy-rp = { version = "0.4.0", features = [
+  "critical-section-impl",
+  "unstable-pac",
+  "time-driver",
+  "binary-info",
+] }
+embassy-futures = "0.1.1"
+embassy-time = "0.4.0"
+embassy-embedded-hal = "0.3.0"
+embassy-sync = { version = "0.7" }
+trouble-host = { version = "0.1", features = [
+  "derive",
+  "scan",
+], optional = true }
+bt-hci = { version = "0.2", default-features = false, optional = true }
+cyw43 = { version = "0.3.0", features = [
+  "firmware-logs",
+  "bluetooth",
+], optional = true }
+cyw43-pio = { version = "0.3.0", optional = true }
+
+embedded-hal-bus = { version = "0.3.0", features = ["async"] }
+embedded-hal = "0.2.7"
+embedded-hal-async = "1.0.0"
+cortex-m = { version = "0.7.7" }
+cortex-m-rt = "0.7.5"
+panic-probe = "0.3"
+portable-atomic = { version = "1.11", features = ["critical-section"] }
+
+defmt = { version = "0.3", optional = true }
+defmt-rtt = "0.4.2"
+
+embedded-graphics = { version = "0.8.1" }
+embedded-sdmmc = { git = "https://github.com/Be-ing/embedded-sdmmc-rs", branch = "bisync", default-features = false }
+st7365p-lcd = { git = "https://github.com/legitcamper/st7365p-lcd-rs", branch = "async" }
+
+shared = { path = "../shared" }
+abi = { path = "../abi" }
+
+static_cell = "2.1.1"
+bitflags = "2.9.1"
+talc = "4.4.3"
+spin = "0.10.0"
+heapless = "0.8.0"
diff --git a/build.rs b/kernel/build.rs
similarity index 96%
rename from build.rs
rename to kernel/build.rs
index 30691aa..e0ded4a 100644
--- a/build.rs
+++ b/kernel/build.rs
@@ -19,7 +19,7 @@ fn main() {
     let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
     File::create(out.join("memory.x"))
         .unwrap()
-        .write_all(include_bytes!("memory.x"))
+        .write_all(include_bytes!("../memory.x"))
         .unwrap();
     println!("cargo:rustc-link-search={}", out.display());
 
diff --git a/src/display.rs b/kernel/src/display.rs
similarity index 100%
rename from src/display.rs
rename to kernel/src/display.rs
diff --git a/src/main.rs b/kernel/src/main.rs
similarity index 87%
rename from src/main.rs
rename to kernel/src/main.rs
index e754b93..80184e9 100644
--- a/src/main.rs
+++ b/kernel/src/main.rs
@@ -1,7 +1,7 @@
 #![feature(impl_trait_in_assoc_type)]
 #![feature(ascii_char)]
-#![no_std]
-#![no_main]
+#![cfg_attr(not(test), no_std)]
+#![cfg_attr(not(test), no_main)]
 
 use crate::{
     display::DISPLAY_SIGNAL,
@@ -80,3 +80,16 @@ async fn main(_spawner: Spawner) {
     )
     .await;
 }
+
+use abi::Syscall;
+
+#[no_mangle]
+pub extern "C" fn syscall_dispatch(call: *const Syscall) -> usize {
+    let call = unsafe { &*call };
+    match call {
+        Syscall::DrawPixel { x, y, color } => {
+            draw_pixel(*x, *y, *color);
+            0
+        }
+    }
+}
diff --git a/kernel/src/peripherals/keyboard.rs b/kernel/src/peripherals/keyboard.rs
new file mode 100644
index 0000000..a9ef605
--- /dev/null
+++ b/kernel/src/peripherals/keyboard.rs
@@ -0,0 +1,59 @@
+use crate::peripherals::PERIPHERAL_BUS;
+pub use shared::keyboard::{KeyCode, KeyEvent, KeyState, Modifiers};
+
+const REG_ID_KEY: u8 = 0x04;
+const REG_ID_FIF: u8 = 0x09;
+
+const KEY_CAPSLOCK: u8 = 1 << 5;
+const KEY_NUMLOCK: u8 = 1 << 6;
+const KEY_COUNT_MASK: u8 = 0x1F; // 0x1F == 31
+
+pub async fn read_keyboard_fifo() -> Option<KeyEvent> {
+    let mut i2c = PERIPHERAL_BUS.get().lock().await;
+    let i2c = i2c.as_mut().unwrap();
+
+    let mut key_status = [0_u8; 1];
+
+    if i2c
+        .write_read_async(super::MCU_ADDR, [REG_ID_KEY], &mut key_status)
+        .await
+        .is_ok()
+    {
+        let _caps = key_status[0] & KEY_CAPSLOCK == KEY_CAPSLOCK;
+        let _num = key_status[0] & KEY_NUMLOCK == KEY_NUMLOCK;
+        let fifo_count = key_status[0] & KEY_COUNT_MASK;
+
+        if fifo_count >= 1 {
+            let mut event = [0_u8; 2];
+
+            if i2c
+                .write_read_async(super::MCU_ADDR, [REG_ID_FIF], &mut event)
+                .await
+                .is_ok()
+            {
+                return Some(KeyEvent {
+                    state: KeyState::from(event[0]),
+                    key: KeyCode::from(event[1]),
+                    mods: Modifiers::NONE,
+                });
+            }
+        }
+    }
+    None
+}
+
+const REG_ID_DEB: u8 = 0x06;
+const REG_ID_FRQ: u8 = 0x07;
+
+pub async fn configure_keyboard(debounce: u8, poll_freq: u8) {
+    let mut i2c = PERIPHERAL_BUS.get().lock().await;
+    let i2c = i2c.as_mut().unwrap();
+
+    let _ = i2c
+        .write_read_async(super::MCU_ADDR, [REG_ID_DEB], &mut [debounce])
+        .await;
+
+    let _ = i2c
+        .write_read_async(super::MCU_ADDR, [REG_ID_FRQ], &mut [poll_freq])
+        .await;
+}
diff --git a/src/peripherals/mod.rs b/kernel/src/peripherals/mod.rs
similarity index 100%
rename from src/peripherals/mod.rs
rename to kernel/src/peripherals/mod.rs
diff --git a/shared/Cargo.toml b/shared/Cargo.toml
new file mode 100644
index 0000000..4ceba1e
--- /dev/null
+++ b/shared/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "shared"
+version = "0.1.0"
+edition = "2024"
+
+[features]
+defmt = ["dep:defmt"]
+
+[dependencies]
+bitflags = "2.9.1"
+defmt = { version = "1.0.1", optional = true }
diff --git a/shared/src/lib.rs b/shared/src/lib.rs
new file mode 100644
index 0000000..3823869
--- /dev/null
+++ b/shared/src/lib.rs
@@ -0,0 +1,142 @@
+#![no_std]
+
+pub mod keyboard {
+    bitflags::bitflags! {
+        #[derive(Default, Debug, PartialEq, Eq, Clone, Copy)]
+        pub struct Modifiers: u8 {
+            const NONE = 0;
+            const CTRL = 1;
+            const ALT = 2;
+            const LSHIFT = 4;
+            const RSHIFT = 8;
+            const SYM = 16;
+        }
+    }
+
+    #[derive(Debug)]
+    pub struct KeyEvent {
+        pub key: KeyCode,
+        pub state: KeyState,
+        pub mods: Modifiers,
+    }
+
+    #[cfg_attr(feature = "defmt", derive(defmt::Format))]
+    #[derive(Debug, Clone, Copy, PartialEq, Eq)]
+    pub enum KeyState {
+        Idle = 0,
+        Pressed = 1,
+        Hold = 2,
+        Released = 3,
+    }
+
+    impl From<u8> for KeyState {
+        fn from(value: u8) -> Self {
+            match value {
+                1 => KeyState::Pressed,
+                2 => KeyState::Hold,
+                3 => KeyState::Released,
+                0 | _ => KeyState::Idle,
+            }
+        }
+    }
+
+    #[cfg_attr(feature = "defmt", derive(defmt::Format))]
+    #[derive(Debug, Clone, Copy, PartialEq, Eq)]
+    #[repr(C)]
+    #[repr(u8)]
+    pub enum KeyCode {
+        JoyUp = 0x01,
+        JoyDown = 0x02,
+        JoyLeft = 0x03,
+        JoyRight = 0x04,
+        JoyCenter = 0x05,
+        BtnLeft1 = 0x06,
+        BtnRight1 = 0x07,
+        BtnLeft2 = 0x11,
+        BtnRight2 = 0x12,
+        Backspace = 0x08,
+        Tab = 0x09,
+        Enter = 0x0A,
+        ModAlt = 0xA1,
+        ModShiftLeft = 0xA2,
+        ModShiftRight = 0xA3,
+        ModSym = 0xA4,
+        ModCtrl = 0xA5,
+        Esc = 0xB1,
+        Left = 0xB4,
+        Up = 0xB5,
+        Down = 0xB6,
+        Right = 0xB7,
+        Break = 0xD0,
+        Insert = 0xD1,
+        Home = 0xD2,
+        Del = 0xD4,
+        End = 0xD5,
+        PageUp = 0xD6,
+        PageDown = 0xD7,
+        CapsLock = 0xC1,
+        F1 = 0x81,
+        F2 = 0x82,
+        F3 = 0x83,
+        F4 = 0x84,
+        F5 = 0x85,
+        F6 = 0x86,
+        F7 = 0x87,
+        F8 = 0x88,
+        F9 = 0x89,
+        F10 = 0x90,
+        Char(char),
+        Unknown(u8),
+    }
+
+    impl From<u8> for KeyCode {
+        fn from(value: u8) -> Self {
+            match value {
+                0x01 => Self::JoyUp,
+                0x02 => Self::JoyDown,
+                0x03 => Self::JoyLeft,
+                0x04 => Self::JoyRight,
+                0x05 => Self::JoyCenter,
+                0x06 => Self::BtnLeft1,
+                0x07 => Self::BtnRight1,
+                0x08 => Self::Backspace,
+                0x09 => Self::Tab,
+                0x0A => Self::Enter,
+                0x11 => Self::BtnLeft2,
+                0x12 => Self::BtnRight2,
+                0xA1 => Self::ModAlt,
+                0xA2 => Self::ModShiftLeft,
+                0xA3 => Self::ModShiftRight,
+                0xA4 => Self::ModSym,
+                0xA5 => Self::ModCtrl,
+                0xB1 => Self::Esc,
+                0xB4 => Self::Left,
+                0xB5 => Self::Up,
+                0xB6 => Self::Down,
+                0xB7 => Self::Right,
+                0xC1 => Self::CapsLock,
+                0xD0 => Self::Break,
+                0xD1 => Self::Insert,
+                0xD2 => Self::Home,
+                0xD4 => Self::Del,
+                0xD5 => Self::End,
+                0xD6 => Self::PageUp,
+                0xD7 => Self::PageDown,
+                0x81 => Self::F1,
+                0x82 => Self::F2,
+                0x83 => Self::F3,
+                0x84 => Self::F4,
+                0x85 => Self::F5,
+                0x86 => Self::F6,
+                0x87 => Self::F7,
+                0x88 => Self::F8,
+                0x89 => Self::F9,
+                0x90 => Self::F10,
+                _ => match char::from_u32(value as u32) {
+                    Some(c) => Self::Char(c),
+                    None => Self::Unknown(value),
+                },
+            }
+        }
+    }
+}
diff --git a/src/peripherals/keyboard.rs b/src/peripherals/keyboard.rs
deleted file mode 100644
index 208a335..0000000
--- a/src/peripherals/keyboard.rs
+++ /dev/null
@@ -1,197 +0,0 @@
-
-use crate::peripherals::PERIPHERAL_BUS;
-
-const REG_ID_KEY: u8 = 0x04;
-const REG_ID_FIF: u8 = 0x09;
-
-const KEY_CAPSLOCK: u8 = 1 << 5;
-const KEY_NUMLOCK: u8 = 1 << 6;
-const KEY_COUNT_MASK: u8 = 0x1F; // 0x1F == 31
-
-pub async fn read_keyboard_fifo() -> Option<KeyEvent> {
-    let mut i2c = PERIPHERAL_BUS.get().lock().await;
-    let i2c = i2c.as_mut().unwrap();
-
-    let mut key_status = [0_u8; 1];
-
-    if i2c
-        .write_read_async(super::MCU_ADDR, [REG_ID_KEY], &mut key_status)
-        .await
-        .is_ok()
-    {
-        let _caps = key_status[0] & KEY_CAPSLOCK == KEY_CAPSLOCK;
-        let _num = key_status[0] & KEY_NUMLOCK == KEY_NUMLOCK;
-        let fifo_count = key_status[0] & KEY_COUNT_MASK;
-
-        if fifo_count >= 1 {
-            let mut event = [0_u8; 2];
-
-            if i2c
-                .write_read_async(super::MCU_ADDR, [REG_ID_FIF], &mut event)
-                .await
-                .is_ok()
-            {
-                return Some(KeyEvent {
-                    state: KeyState::from(event[0]),
-                    key: KeyCode::from(event[1]),
-                    mods: Modifiers::NONE,
-                });
-            }
-        }
-    }
-    None
-}
-
-const REG_ID_DEB: u8 = 0x06;
-const REG_ID_FRQ: u8 = 0x07;
-
-pub async fn configure_keyboard(debounce: u8, poll_freq: u8) {
-    let mut i2c = PERIPHERAL_BUS.get().lock().await;
-    let i2c = i2c.as_mut().unwrap();
-
-    let _ = i2c
-        .write_read_async(super::MCU_ADDR, [REG_ID_DEB], &mut [debounce])
-        .await;
-
-    let _ = i2c
-        .write_read_async(super::MCU_ADDR, [REG_ID_FRQ], &mut [poll_freq])
-        .await;
-}
-
-bitflags::bitflags! {
-    #[derive(Default, Debug, PartialEq, Eq, Clone, Copy)]
-    pub struct Modifiers: u8 {
-        const NONE = 0;
-        const CTRL = 1;
-        const ALT = 2;
-        const LSHIFT = 4;
-        const RSHIFT = 8;
-        const SYM = 16;
-    }
-}
-
-#[derive(Debug)]
-pub struct KeyEvent {
-    pub key: KeyCode,
-    pub state: KeyState,
-    pub mods: Modifiers,
-}
-
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum KeyState {
-    Idle = 0,
-    Pressed = 1,
-    Hold = 2,
-    Released = 3,
-}
-
-impl From<u8> for KeyState {
-    fn from(value: u8) -> Self {
-        match value {
-            1 => KeyState::Pressed,
-            2 => KeyState::Hold,
-            3 => KeyState::Released,
-            0 | _ => KeyState::Idle,
-        }
-    }
-}
-
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-#[repr(u8)]
-pub enum KeyCode {
-    JoyUp = 0x01,
-    JoyDown = 0x02,
-    JoyLeft = 0x03,
-    JoyRight = 0x04,
-    JoyCenter = 0x05,
-    BtnLeft1 = 0x06,
-    BtnRight1 = 0x07,
-    BtnLeft2 = 0x11,
-    BtnRight2 = 0x12,
-    Backspace = 0x08,
-    Tab = 0x09,
-    Enter = 0x0A,
-    ModAlt = 0xA1,
-    ModShiftLeft = 0xA2,
-    ModShiftRight = 0xA3,
-    ModSym = 0xA4,
-    ModCtrl = 0xA5,
-    Esc = 0xB1,
-    Left = 0xB4,
-    Up = 0xB5,
-    Down = 0xB6,
-    Right = 0xB7,
-    Break = 0xD0,
-    Insert = 0xD1,
-    Home = 0xD2,
-    Del = 0xD4,
-    End = 0xD5,
-    PageUp = 0xD6,
-    PageDown = 0xD7,
-    CapsLock = 0xC1,
-    F1 = 0x81,
-    F2 = 0x82,
-    F3 = 0x83,
-    F4 = 0x84,
-    F5 = 0x85,
-    F6 = 0x86,
-    F7 = 0x87,
-    F8 = 0x88,
-    F9 = 0x89,
-    F10 = 0x90,
-    Char(char),
-    Unknown(u8),
-}
-
-impl From<u8> for KeyCode {
-    fn from(value: u8) -> Self {
-        match value {
-            0x01 => Self::JoyUp,
-            0x02 => Self::JoyDown,
-            0x03 => Self::JoyLeft,
-            0x04 => Self::JoyRight,
-            0x05 => Self::JoyCenter,
-            0x06 => Self::BtnLeft1,
-            0x07 => Self::BtnRight1,
-            0x08 => Self::Backspace,
-            0x09 => Self::Tab,
-            0x0A => Self::Enter,
-            0x11 => Self::BtnLeft2,
-            0x12 => Self::BtnRight2,
-            0xA1 => Self::ModAlt,
-            0xA2 => Self::ModShiftLeft,
-            0xA3 => Self::ModShiftRight,
-            0xA4 => Self::ModSym,
-            0xA5 => Self::ModCtrl,
-            0xB1 => Self::Esc,
-            0xB4 => Self::Left,
-            0xB5 => Self::Up,
-            0xB6 => Self::Down,
-            0xB7 => Self::Right,
-            0xC1 => Self::CapsLock,
-            0xD0 => Self::Break,
-            0xD1 => Self::Insert,
-            0xD2 => Self::Home,
-            0xD4 => Self::Del,
-            0xD5 => Self::End,
-            0xD6 => Self::PageUp,
-            0xD7 => Self::PageDown,
-            0x81 => Self::F1,
-            0x82 => Self::F2,
-            0x83 => Self::F3,
-            0x84 => Self::F4,
-            0x85 => Self::F5,
-            0x86 => Self::F6,
-            0x87 => Self::F7,
-            0x88 => Self::F8,
-            0x89 => Self::F9,
-            0x90 => Self::F10,
-            _ => match char::from_u32(value as u32) {
-                Some(c) => Self::Char(c),
-                None => Self::Unknown(value),
-            },
-        }
-    }
-}
diff --git a/user-apps/calculator/Cargo.toml b/user-apps/calculator/Cargo.toml
new file mode 100644
index 0000000..ed5cba5
--- /dev/null
+++ b/user-apps/calculator/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "calculator"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/user-apps/calculator/src/main.rs b/user-apps/calculator/src/main.rs
new file mode 100644
index 0000000..e7a11a9
--- /dev/null
+++ b/user-apps/calculator/src/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}