diff --git a/src/devices/bus/isa/hdc.cpp b/src/devices/bus/isa/hdc.cpp
index eb1f55eb682..05f298db6b2 100644
--- a/src/devices/bus/isa/hdc.cpp
+++ b/src/devices/bus/isa/hdc.cpp
@@ -957,7 +957,7 @@ void isa8_hdc_device::device_reset()
 {
 	dip = ioport("HDD")->read();
 
-	if (ioport("ROM")->read() == 1)
+	if (ioport("ROM")->read() == 1 && m_hdc->install_rom())
 		m_isa->install_rom(this, 0xc8000, 0xc9fff, "hdc", "hdc");
 }
 
diff --git a/src/devices/bus/isa/hdc.h b/src/devices/bus/isa/hdc.h
index e2f3a081624..275028de4b9 100644
--- a/src/devices/bus/isa/hdc.h
+++ b/src/devices/bus/isa/hdc.h
@@ -50,6 +50,7 @@ public:
 	UINT8 status_r();
 	void set_ready();
 	UINT8 get_command() { return buffer[0]; }
+	bool install_rom() { return (m_type != EC1841); }
 
 protected:
 	// device-level overrides