diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..fcce65e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,12 @@
+# WHP16 module build outputs generated by fasm2.cmd / Session -> Build
+/x16/*.bin
+
+# Common assembler listing/symbol sidecars from local experiments
+/x16/*.fas
+/x16/*.lst
+/x16/*.map
+/x16/*.sym
+
+# Local editor/OS noise
+.DS_Store
+Thumbs.db