diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
new file mode 100644
index 0000000..7c85e89
--- /dev/null
+++ b/.github/workflows/build.yaml
@@ -0,0 +1,24 @@
+---
+on:
+  push:
+    branches:
+      - "master"
+
+jobs:
+  "build-roms":
+    runs-on: "ubuntu-latest"
+    steps:
+      - name: "prepare runner"
+        run: |
+          set -x
+          sudo apt-get update -qqq
+          sudo apt-get upgrade -qqq
+          sudo apt-get install -qqq xa65
+
+      - uses: "actions/checkout@v3"
+
+      - name: "make"
+        run: |
+          set -x
+          cd rom
+          make
diff --git a/rom/Makefile.mingw b/rom/Makefile
similarity index 97%
rename from rom/Makefile.mingw
rename to rom/Makefile
index 1c240ef..ca6170e 100644
--- a/rom/Makefile.mingw
+++ b/rom/Makefile
@@ -22,6 +22,7 @@ RELOC65=reloc65
 .r65.a65:
 	$(RELOC65) -xt -o $@ $(RELOC65FLAGS) $<
 
+.PHONY: all
 all: $(TARGETS)
 epple2sys.r65: CODE_SEG=64512
 epple2sys.s65: epple2sys.m4 asm.m4h
diff --git a/rom/Makefile.am b/rom/Makefile.am
deleted file mode 100644
index 6424d7b..0000000
--- a/rom/Makefile.am
+++ /dev/null
@@ -1,58 +0,0 @@
-#@configure_input@
-#!/usr/bin/make -f
-
-AUTOMAKE_OPTIONS=-Wno-override
-
-ZEROSEGS=-bd 0 -bb 0 -bz 0
-
-.m4.s65:
-	$(M4) -I $(srcdir) $(M4FLAGS) $< >$@
-
-.s65.o65:
-	$(XA65) -C -M -R -c -bt 0 $(ZERO_SEGS) -o $@ $(XA65FLAGS) $<
-
-.o65.r65:
-	$(LDO65) -bt $(CODE_SEG) $(ZERO_SEGS) -o $@ $(LD65FLAGS) $^
-
-.r65.a65:
-	$(RELOC65) -xt -o $@ $(RELOC65FLAGS) $<
-
-libsysdir=$(prefix)/lib/epple2/system
-libcrddir=$(prefix)/lib/epple2/cards
-
-libsys_DATA=epple2sys.a65
-libcrd_DATA=stdin.a65 stdout.a65 clock.a65
-noinst_DATA=epple2sys.md5 stdin.md5 stdout.md5 clock.md5
-EXTRA_DIST=epple2sys.m4 asm.m4h stdin.s65 stdout.s65 clock.s65 epple2sys.md5 stdin.md5 stdout.md5 clock.md5
-
-epple2sys.r65: CODE_SEG=64512
-epple2sys.s65: epple2sys.m4 asm.m4h
-
-clock.r65: CODE_SEG=0
-stdin.r65: CODE_SEG=0
-stdout.r65: CODE_SEG=0
-
-define_new_md5: all
-	$(MD5SUM) --binary epple2sys.a65 >$(srcdir)/epple2sys.md5
-
-check_SCRIPTS=unit_test.sh
-TESTS=$(check_SCRIPTS)
-
-unit_test.sh:
-	touch $@
-	if test "X$(MD5SUM)" == X ; \
-	then \
-		echo "echo \"md5sum program not found, so cannot run this test\" >&2" >>$@ ; \
-		echo "exit 1" >>$@ ; \
-	else \
-		echo "set -e" >>$@ ; \
-		echo "$(MD5SUM) --check --status --warn $(srcdir)/epple2sys.md5" >>$@ ; \
-		echo "$(MD5SUM) --check --status --warn $(srcdir)/stdin.md5" >>$@ ; \
-		echo "$(MD5SUM) --check --status --warn $(srcdir)/stdout.md5" >>$@ ; \
-		echo "$(MD5SUM) --check --status --warn $(srcdir)/clock.md5" >>$@ ; \
-	fi
-	chmod +x $@
-
-
-
-CLEANFILES=unit_test.sh *.a65 *.r65 epple2sys.s65
diff --git a/rom/clock.s65 b/rom/clock.m4
similarity index 100%
rename from rom/clock.s65
rename to rom/clock.m4
diff --git a/rom/clock.md5 b/rom/clock.md5
deleted file mode 100644
index 6f76100..0000000
--- a/rom/clock.md5
+++ /dev/null
@@ -1 +0,0 @@
-ef0159bc66a6f3b20e2fe6f634361a54 *clock.a65
diff --git a/rom/epple2sys.md5 b/rom/epple2sys.md5
deleted file mode 100644
index d218293..0000000
--- a/rom/epple2sys.md5
+++ /dev/null
@@ -1 +0,0 @@
-784b0b39ee03b593dc83bb7f989c7205 *epple2sys.a65
diff --git a/rom/stdin.s65 b/rom/stdin.m4
similarity index 100%
rename from rom/stdin.s65
rename to rom/stdin.m4
diff --git a/rom/stdin.md5 b/rom/stdin.md5
deleted file mode 100644
index 81e9cad..0000000
--- a/rom/stdin.md5
+++ /dev/null
@@ -1 +0,0 @@
-a09d60bfcbbb5cbdb3334e5ae57ddc8b *stdin.a65
diff --git a/rom/stdout.s65 b/rom/stdout.m4
similarity index 100%
rename from rom/stdout.s65
rename to rom/stdout.m4
diff --git a/rom/stdout.md5 b/rom/stdout.md5
deleted file mode 100644
index 902d71c..0000000
--- a/rom/stdout.md5
+++ /dev/null
@@ -1 +0,0 @@
-a414efb58aa5291e7888fb7a8b088c94 *stdout.a65