diff --git a/src/devices/cpu/m6809/hd6309.cpp b/src/devices/cpu/m6809/hd6309.cpp
index 1b40d17e06f..0937a575542 100644
--- a/src/devices/cpu/m6809/hd6309.cpp
+++ b/src/devices/cpu/m6809/hd6309.cpp
@@ -126,19 +126,30 @@ March 2013 NPW:
 //**************************************************************************
 
 DEFINE_DEVICE_TYPE(HD6309, hd6309_device, "hd6309", "HD6309")
+DEFINE_DEVICE_TYPE(HD6309E, hd6309e_device, "hd6309e", "HD6309E")
 
 
 //-------------------------------------------------
 //  hd6309_device - constructor
 //-------------------------------------------------
 
-hd6309_device::hd6309_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
-	m6809_base_device(mconfig, tag, owner, clock, HD6309, 4),
+hd6309_device::hd6309_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock, device_type type, int divider) :
+	m6809_base_device(mconfig, tag, owner, clock, type, divider),
 	m_md(0),
 	m_temp_im(0)
 {
 }
 
+hd6309_device::hd6309_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+	hd6309_device(mconfig, tag, owner, clock, HD6309, 4)
+{
+}
+
+hd6309e_device::hd6309e_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+	hd6309_device(mconfig, tag, owner, clock, HD6309E, 1)
+{
+}
+
 //-------------------------------------------------
 //  device_start - device-specific startup
 //-------------------------------------------------
diff --git a/src/devices/cpu/m6809/hd6309.h b/src/devices/cpu/m6809/hd6309.h
index 8e209f9f7b2..26352b6fe57 100644
--- a/src/devices/cpu/m6809/hd6309.h
+++ b/src/devices/cpu/m6809/hd6309.h
@@ -20,8 +20,9 @@
 //  TYPE DEFINITIONS
 //**************************************************************************
 
-// device type definition
+// device type definitions
 DECLARE_DEVICE_TYPE(HD6309, hd6309_device)
+DECLARE_DEVICE_TYPE(HD6309E, hd6309e_device)
 
 // ======================> hd6309_device
 
@@ -32,6 +33,9 @@ public:
 	hd6309_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
 
 protected:
+	// delegating constructor
+	hd6309_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock, device_type type, int divider);
+
 	// device-level overrides
 	virtual void device_start() override;
 	virtual void device_reset() override;
@@ -138,6 +142,15 @@ enum
 	HD6309_ZERO_WORD
 };
 
+// ======================> hd6309e_device
+
+class hd6309e_device : public hd6309_device
+{
+public:
+	// construction/destruction
+	hd6309e_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+};
+
 #define HD6309_IRQ_LINE  M6809_IRQ_LINE   /* 0 - IRQ line number */
 #define HD6309_FIRQ_LINE M6809_FIRQ_LINE  /* 1 - FIRQ line number */
 
diff --git a/src/mame/drivers/ajax.cpp b/src/mame/drivers/ajax.cpp
index f03b73e394e..7f5c449de89 100644
--- a/src/mame/drivers/ajax.cpp
+++ b/src/mame/drivers/ajax.cpp
@@ -173,7 +173,7 @@ static MACHINE_CONFIG_START( ajax )
 	MCFG_CPU_ADD("maincpu", KONAMI, XTAL_24MHz/2/4)    /* 052001 12/4 MHz*/
 	MCFG_CPU_PROGRAM_MAP(ajax_main_map)
 
-	MCFG_CPU_ADD("sub", HD6309, 3000000) /* ? */
+	MCFG_CPU_ADD("sub", HD6309E, 3000000) /* ? */
 	MCFG_CPU_PROGRAM_MAP(ajax_sub_map)
 
 	MCFG_CPU_ADD("audiocpu", Z80, 3579545)  /* 3.58 MHz */