diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..2af5748
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,181 @@
+name: release 
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+env:
+  CARGO_TERM_COLOR: always
+  RUSTFLAGS: -D warnings
+
+jobs:
+  crate_metadata:
+    name: Extract crate metadata
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Extract crate information
+      id: crate_metadata
+      run: |
+        cargo metadata --no-deps --format-version 1 | jq -r '"name=" + .packages[0].name' | tee -a $GITHUB_OUTPUT
+        cargo metadata --no-deps --format-version 1 | jq -r '"version=" + .packages[0].version' | tee -a $GITHUB_OUTPUT
+        cargo metadata --no-deps --format-version 1 | jq -r '"maintainer=" + .packages[0].authors[0]' | tee -a $GITHUB_OUTPUT
+        cargo metadata --no-deps --format-version 1 | jq -r '"homepage=" + .packages[0].homepage' | tee -a $GITHUB_OUTPUT
+        cargo metadata --no-deps --format-version 1 | jq -r '"msrv=" + .packages[0].rust_version' | tee -a $GITHUB_OUTPUT
+    outputs:
+      name: ${{ steps.crate_metadata.outputs.name }}
+      version: ${{ steps.crate_metadata.outputs.version }}
+      maintainer: ${{ steps.crate_metadata.outputs.maintainer }}
+      homepage: ${{ steps.crate_metadata.outputs.homepage }}
+      msrv: ${{ steps.crate_metadata.outputs.msrv }}
+  release:
+    name: ${{ matrix.job.target }} (${{ matrix.job.os }})
+    runs-on: ${{ matrix.job.os }}
+    needs: crate_metadata
+    strategy:
+      fail-fast: false
+      matrix:
+        job:
+          #- { target: aarch64-unknown-linux-gnu   , os: ubuntu-20.04, use-cross: true }
+          #- { target: arm-unknown-linux-gnueabihf , os: ubuntu-20.04, use-cross: true }
+          #- { target: arm-unknown-linux-musleabihf, os: ubuntu-20.04, use-cross: true }
+          #- { target: i686-pc-windows-msvc        , os: windows-2019                  }
+          #- { target: i686-unknown-linux-gnu      , os: ubuntu-20.04, use-cross: true }
+          #- { target: i686-unknown-linux-musl     , os: ubuntu-20.04, use-cross: true }
+          #- { target: x86_64-apple-darwin         , os: macos-12                      }
+          #- { target: x86_64-pc-windows-gnu       , os: windows-2019                  }
+          #- { target: x86_64-pc-windows-msvc      , os: windows-2019                  }
+          - { target: x86_64-unknown-linux-gnu    , os: ubuntu-latest, use-cross: true }
+          #- { target: x86_64-unknown-linux-musl   , os: ubuntu-20.04, use-cross: true }
+    env:
+      BUILD_CMD: cargo
+    steps:
+    - name: Checkout source code
+      uses: actions/checkout@v4
+
+    - name: Install prerequisites
+      shell: bash
+      run: |
+        case ${{ matrix.job.target }} in
+          arm-unknown-linux-*) sudo apt-get -y update ; sudo apt-get -y install gcc-arm-linux-gnueabihf ;;
+          aarch64-unknown-linux-gnu) sudo apt-get -y update ; sudo apt-get -y install gcc-aarch64-linux-gnu ;;
+        esac
+
+    - name: Install Rust toolchain
+      uses: dtolnay/rust-toolchain@stable
+      with:
+        targets: ${{ matrix.job.target }}
+
+    - name: Install cross
+      if: matrix.job.use-cross
+      uses: taiki-e/install-action@v2
+      with:
+        tool: cross
+
+    - name: Overwrite build command env variable
+      if: matrix.job.use-cross
+      shell: bash
+      run: echo "BUILD_CMD=cross" >> $GITHUB_ENV
+
+    - name: Show version information (Rust, cargo, GCC)
+      shell: bash
+      run: |
+        gcc --version || true
+        rustup -V
+        rustup toolchain list
+        rustup default
+        cargo -V
+        rustc -V
+
+    - name: Build
+      shell: bash
+      run: $BUILD_CMD build --locked --release --target=${{ matrix.job.target }}
+
+    - name: Set binary name & path
+      id: bin
+      shell: bash
+      run: |
+        # Figure out suffix of binary
+        EXE_suffix=""
+        case ${{ matrix.job.target }} in
+          *-pc-windows-*) EXE_suffix=".exe" ;;
+        esac;
+
+        # Setup paths
+        BIN_NAME="${{ needs.crate_metadata.outputs.name }}${EXE_suffix}"
+        BIN_PATH="target/${{ matrix.job.target }}/release/${BIN_NAME}"
+
+        # Let subsequent steps know where to find the binary
+        echo "BIN_PATH=${BIN_PATH}" >> $GITHUB_OUTPUT
+        echo "BIN_NAME=${BIN_NAME}" >> $GITHUB_OUTPUT
+
+#- name: Set testing options
+#  id: test-options
+#  shell: bash
+#  run: |
+#    # test only library unit tests and binary for arm-type targets
+#    unset CARGO_TEST_OPTIONS
+#    unset CARGO_TEST_OPTIONS ; case ${{ matrix.job.target }} in arm-* | aarch64-*) CARGO_TEST_OPTIONS="--lib --bin ${{ needs.crate_metadata.outputs.name }}" ;; esac;
+#    echo "CARGO_TEST_OPTIONS=${CARGO_TEST_OPTIONS}" >> $GITHUB_OUTPUT
+
+#    - name: Run tests
+#      shell: bash
+#      run: $BUILD_CMD test --locked --target=${{ matrix.job.target }} ${{ steps.test-options.outputs.CARGO_TEST_OPTIONS}}
+
+    - name: Create tarball
+      id: package
+      shell: bash
+      run: |
+        PKG_suffix=".tar.gz" ; case ${{ matrix.job.target }} in *-pc-windows-*) PKG_suffix=".zip" ;; esac;
+        PKG_BASENAME=${{ needs.crate_metadata.outputs.name }}-v${{ needs.crate_metadata.outputs.version }}-${{ matrix.job.target }}
+        PKG_NAME=${PKG_BASENAME}${PKG_suffix}
+        echo "PKG_NAME=${PKG_NAME}" >> $GITHUB_OUTPUT
+
+        PKG_STAGING="${{ env.CICD_INTERMEDIATES_DIR }}/package"
+        ARCHIVE_DIR="${PKG_STAGING}/${PKG_BASENAME}/"
+        mkdir -p "${ARCHIVE_DIR}"
+
+        # Binary
+        cp "${{ steps.bin.outputs.BIN_PATH }}" "$ARCHIVE_DIR"
+
+        # README and LICENSE files
+        cp "README.md" "LICENSE-MIT" "LICENSE-APACHE" "$ARCHIVE_DIR"
+
+        # Desktop file and icons
+        #mkdir "$ARCHIVE_DIR/assets"
+        #cp "assets/fpt.desktop" assets/numbat-*x*.png "assets/numbat.svg" "$ARCHIVE_DIR/assets"
+
+        # base compressed package
+        pushd "${PKG_STAGING}/" >/dev/null
+        case ${{ matrix.job.target }} in
+          *-pc-windows-*) 7z -y a "${PKG_NAME}" "${PKG_BASENAME}"/* | tail -2 ;;
+          *) tar czf "${PKG_NAME}" "${PKG_BASENAME}"/* ;;
+        esac;
+        popd >/dev/null
+
+        # Let subsequent steps know where to find the compressed package
+        echo "PKG_PATH=${PKG_STAGING}/${PKG_NAME}" >> $GITHUB_OUTPUT
+
+    - name: "Artifact upload: tarball"
+      uses: actions/upload-artifact@master
+      with:
+        name: ${{ steps.package.outputs.PKG_NAME }}
+        path: ${{ steps.package.outputs.PKG_PATH }}
+
+    - name: Check for release
+      id: is-release
+      shell: bash
+      run: |
+        unset IS_RELEASE ; if [[ $GITHUB_REF =~ ^refs/tags/v[0-9].* ]]; then IS_RELEASE='true' ; else IS_RELEASE='true'; fi
+        echo "IS_RELEASE=${IS_RELEASE}" >> $GITHUB_OUTPUT
+
+    - name: Publish archives and packages
+      uses: softprops/action-gh-release@v1
+      if: steps.is-release.outputs.IS_RELEASE
+      with:
+        files: |
+          ${{ steps.package.outputs.PKG_PATH }}
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/Cargo.toml b/Cargo.toml
index 441d500..e4ff9f0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,6 +3,6 @@ resolver = "2"
 
 members = [
     "fpt",
-    "fpt-egui",
+    #"fpt-egui",
     "fpt-cli",
 ]
diff --git a/fpt-cli/Cargo.toml b/fpt-cli/Cargo.toml
index 9ff85da..12e544c 100644
--- a/fpt-cli/Cargo.toml
+++ b/fpt-cli/Cargo.toml
@@ -5,10 +5,9 @@ edition = "2021"
 default-run = "main"
 
 [dependencies]
-clap = { version = "4.4.6", features = ["derive"] }
+clap = { version = "4.0", features = ["derive"] }
 fpt = { path = "../fpt" }
 rustyline = "13.0.0"
-hlua = { version = "0.4.1" }
 
 [[bin]]
 name = "main"
diff --git a/fpt-cli/src/lib.rs b/fpt-cli/src/lib.rs
index aa2bdf7..5c41a69 100644
--- a/fpt-cli/src/lib.rs
+++ b/fpt-cli/src/lib.rs
@@ -1,2 +1,2 @@
-#![feature(array_chunks)]
-#![feature(iter_intersperse)]
+//#![feature(array_chunks)]
+//#![feature(iter_intersperse)]
diff --git a/fpt-cli/src/main.rs b/fpt-cli/src/main.rs
index fe46acc..9840210 100644
--- a/fpt-cli/src/main.rs
+++ b/fpt-cli/src/main.rs
@@ -1,5 +1,5 @@
-#![feature(array_chunks)]
-#![feature(iter_intersperse)]
+//#![feature(array_chunks)]
+//#![feature(iter_intersperse)]
 
 use std::fs;
 
diff --git a/fpt/src/lib.rs b/fpt/src/lib.rs
index 6a956cd..dbcbef0 100644
--- a/fpt/src/lib.rs
+++ b/fpt/src/lib.rs
@@ -1,6 +1,6 @@
-#![feature(bigint_helper_methods)]
-#![feature(array_chunks)]
-#![feature(iter_intersperse)]
+//#![feature(bigint_helper_methods)]
+//#![feature(array_chunks)]
+//#![feature(iter_intersperse)]
 
 use std::collections::VecDeque;
 
diff --git a/fpt/src/lr35902.rs b/fpt/src/lr35902.rs
index 7f5e34a..aaf44c2 100644
--- a/fpt/src/lr35902.rs
+++ b/fpt/src/lr35902.rs
@@ -11,6 +11,19 @@ use crate::{bw, memory};
 
 pub mod instructions;
 
+fn carrying_add(x:u8, y:u8, carry: bool) -> (u8, bool) {
+    let carry: u8 = carry as u8;
+    let half_adder = x ^ y ;
+    let sum = half_adder ^ carry;
+    let carry = (carry & half_adder) | (x & y);
+    (sum, carry == 1)
+}
+
+// yolo
+fn borrowing_sub(x:u8, y:u8, borrow:bool) -> (u8, bool) {
+    carrying_add(x, !y, !borrow)
+}
+
 #[derive(Clone, PartialEq)]
 pub struct LR35902 {
     af: u16,
@@ -403,9 +416,9 @@ impl LR35902 {
         self.set_c_flag(overflow);
         result
     }
-
+    
     fn addc8(&mut self, x: u8, y: u8) -> u8 {
-        let (result, overflow) = x.carrying_add(y, self.c_flag());
+        let (result, overflow) = carrying_add(x, y, self.c_flag());
         self.set_z_flag(result == 0);
         self.set_n_flag(false);
         self.set_h_flag(self.half_carryc8(x, y, self.c_flag() as u8));
@@ -424,10 +437,10 @@ impl LR35902 {
     }
 
     fn subc8(&mut self, x: u8, y: u8) -> u8 {
-        let (result, overflow) = x.borrowing_sub(y, self.c_flag());
+        let (result, overflow) = borrowing_sub(x, y, self.c_flag());
         self.set_z_flag(result == 0);
         self.set_n_flag(true);
-        self.set_h_flag((x & 0x0f).borrowing_sub(y & 0x0f, self.c_flag()).1);
+        self.set_h_flag(borrowing_sub(x & 0x0f, y & 0x0f, self.c_flag()).1);
         self.set_c_flag(overflow);
         result
     }
diff --git a/fpt/src/ppu/tile.rs b/fpt/src/ppu/tile.rs
index 39fe15a..cb9e8cd 100644
--- a/fpt/src/ppu/tile.rs
+++ b/fpt/src/ppu/tile.rs
@@ -103,11 +103,10 @@ pub fn write_pgm_screenshot(frame: &Frame, filename: &str) {
     write!(file, "P2\n# Game Boy screenshot: {filename}\n160 144\n3\n").unwrap();
 
     // Our Game Boy's framebuffer seems to have a direct correspondence to this!
-    for line in frame.array_chunks::<160>() {
+    for line in frame.chunks(160) {
         let pgm_line = line
             .iter()
-            .map(|p| (b'3' - *p) as char) // ASCII from '0' to '3'
-            .intersperse(' ')
+            .map(|p| String::from((b'3' - *p) as char) + " ") // ASCII from '0' to '3'
             .collect::<String>()
             + "\n";
 
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 5ff21ea..fb2b8b0 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,4 +1,5 @@
 [toolchain]
-channel = "nightly-2024-06-11"
+#channel = "nightly-2024-01-01"
+channel = "stable"
 components = [ "rustfmt", "rustc-dev" , "clippy"]
 profile = "minimal"