diff --git a/.gitmodules b/.gitmodules
index a7fa85bb..9010ba90 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,3 +4,6 @@
 [submodule "3rdparty/zmac"]
 	path = 3rdparty/zmac
 	url = https://github.com/FeralChild64/zmac
+[submodule "3rdparty/z80exer"]
+	path = 3rdparty/z80exer
+	url = https://github.com/FeralChild64/z80exer
diff --git a/3rdparty/z80exer b/3rdparty/z80exer
new file mode 160000
index 00000000..8634cccd
--- /dev/null
+++ b/3rdparty/z80exer
@@ -0,0 +1 @@
+Subproject commit 8634cccdd362e030efebcdeec1aeb8b4f2ce9179