diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
new file mode 100644
index 00000000..8182602f
--- /dev/null
+++ b/.github/workflows/build.yaml
@@ -0,0 +1,62 @@
+name: Build pico-mac
+
+on:
+  push:
+  pull_request:
+  release:
+    types: [published]
+  check_suite:
+    types: [rerequested]
+
+
+jobs:
+  bins:
+    runs-on: ubuntu-latest
+    steps:
+
+    - uses: actions/checkout@v4
+      with:
+        persist-credentials: false
+
+    - name: Install ARM GCC
+      uses: carlosperate/arm-none-eabi-gcc-action@v1
+      with:
+        release: '13.2.Rel1'
+
+    - name: get submodules
+      run: git submodule update --init
+
+    - name: get pico-sdk
+      run: git clone --depth=1 -b adafruit-fruit-jam https://github.com/adafruit/pico-sdk ../pico-sdk && (cd ../pico-sdk && git submodule update --init)
+
+    - name: get pico-extras
+      run: git clone --depth=1 https://github.com/raspberrypi/pico-extras ../pico-extras
+
+    - name: build targets
+      run: |
+          ./fruitjam-build.sh
+          mkdir uf2s
+          cp build*/src/*.uf2 uf2s/
+          mkdir elfs
+          cp build*/src/*.elf elfs/
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: uf2 files
+        path: uf2s/*
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: elf files
+        path: elfs/*
+
+    - name: Create release
+      if: startsWith(github.ref, 'refs/tags/')
+      uses: softprops/action-gh-release@v1
+      with:
+        files: uf2s/*
+        fail_on_unmatched_files: true
+        body: "Select a doom_tiny uf2 from the list below, plus the doom1-whx uf2."
+
diff --git a/.gitignore b/.gitignore
index 45dc1afb..61301163 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,6 +14,7 @@ config.status
 configure
 lib
 obj
+picotool
 rpm.spec
 stamp-h
 stamp-h.in
@@ -30,6 +31,8 @@ HEXEN*.pcx
 STRIFE*.pcx
 /build*
 
+*.uf2
+
 # These are the default patterns globally ignored by Subversion:
 *.o
 *.lo
diff --git a/README-fruitjam.md b/README-fruitjam.md
index adfb138e..62d9bebb 100644
--- a/README-fruitjam.md
+++ b/README-fruitjam.md
@@ -2,13 +2,13 @@
 
  * `git submodule update --init`
  * `sh fruitjam_build.sh`
- * `picotool uf2 convert doom1.whx -t bin doom1-whx-for-fruitjam.uf2 -o 0x10080000 --family data`
 
-You will get binary files including `build_fruitjam/src/doom_tiny.uf2`.
-
-Copy the uf2s (I copied `doom1-whx-for-fruitjam.uf2` first then `build_fruitjam/src/doom_tiny.uf2`) to fruit jam.
+You will get binary files including `build_fruitjam/src/doom_tiny.uf2`. and `build_fruitjam/src/doom1-whx-for-fruitjam.uf2`.
+Copy those two uf2s to fruit jam.
 You may need to re-enter the bootloader after copying the first file.
 
+Note: When generating your own whx files, fruit jam ALWAYS uses the offset of 0x10080000.
+
 You should get:
  * Debug UART output on pin "A4"
  * video data on pin 8, sync on 6/7 (I expected data on 9/10 as well but there's not: It's supposed to be 1-bit RGB)
diff --git a/fruitjam-build.sh b/fruitjam-build.sh
index 68fd9e70..2878fd2d 100755
--- a/fruitjam-build.sh
+++ b/fruitjam-build.sh
@@ -1,8 +1,9 @@
 #!/bin/sh
 TAG=fruitjam
+BUILD=build_${TAG}
 export CFLAGS="-include $(pwd)/fruitjam_cflags.h"
 export CXXFLAGS="-include $(pwd)/fruitjam_cflags.h"
-cmake -S . -B build_${TAG} \
+cmake -S . -B $BUILD \
     -DCMAKE_BUILD_TYPE=MinSizeRel \
     -DPICO_SDK_PATH=../pico-sdk \
     -DPICOTOOL_FETCH_FROM_GIT_PATH="$(pwd)/picotool" \
@@ -10,4 +11,5 @@ cmake -S . -B build_${TAG} \
     -DUSE_HSTX=1 \
     ${CMAKE_ARGS} "$@"
 
-make -C build_${TAG} -j$(nproc)
+make -C $BUILD -j$(nproc)
+./picotool/picotool-build/picotool uf2 convert doom1.whx -t bin $BUILD/src/doom1-whx-for-fruitjam.uf2 -o 0x10080000 --family data