diff --git a/.gitmodules b/.gitmodules
index 0f542ca..4ac190d 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -13,3 +13,6 @@
 [submodule "hw/super6502_fpga/src/sub/sd_controller"]
 	path = hw/super6502_fpga/src/sub/sd_controller
 	url = ../sd_controller.git
+[submodule "hw/super6502_fpga/src/sim/sub/verilog-sd-emulator"]
+	path = hw/super6502_fpga/src/sim/sub/verilog-sd-emulator
+	url = ../verilog-sd-emulator.git
diff --git a/hw/super6502_fpga/src/sim/sub/verilog-sd-emulator b/hw/super6502_fpga/src/sim/sub/verilog-sd-emulator
new file mode 160000
index 0000000..72a7868
--- /dev/null
+++ b/hw/super6502_fpga/src/sim/sub/verilog-sd-emulator
@@ -0,0 +1 @@
+Subproject commit 72a7868fa926a8bdc612dddbcd1921aa75abe7c6