diff --git a/src/emu/bus/isa/hdc.c b/src/emu/bus/isa/hdc.c
index f2e59018cdc..59ff19d3432 100644
--- a/src/emu/bus/isa/hdc.c
+++ b/src/emu/bus/isa/hdc.c
@@ -171,7 +171,7 @@ void isa8_hdc_device::device_start()
 	m_isa->install_device(0x0320, 0x0323, 0, 0, read8_delegate( FUNC(isa8_hdc_device::pc_hdc_r), this ), write8_delegate( FUNC(isa8_hdc_device::pc_hdc_w), this ) );
 	m_isa->set_dma_channel(3, this, FALSE);
 	buffer.resize(17*4*512);
-	timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(isa8_hdc_device::hdc_command),this));
+	timer = timer_alloc();
 }
 
 //-------------------------------------------------
@@ -483,7 +483,7 @@ int isa8_hdc_device::test_ready()
 	return 1;
 }
 
-TIMER_CALLBACK_MEMBER(isa8_hdc_device::hdc_command)
+void isa8_hdc_device::hdc_command()
 {
 	int set_error_info = 1;
 	int old_error = error;          /* Previous error data is needed for CMD_SENSE */
@@ -585,6 +585,13 @@ TIMER_CALLBACK_MEMBER(isa8_hdc_device::hdc_command)
 	if(no_dma()) pc_hdc_result(set_error_info);
 }
 
+
+void isa8_hdc_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
+{
+	hdc_command();
+}
+
+
 /*  Command format
  *  Bits     Description
  *  7      0
diff --git a/src/emu/bus/isa/hdc.h b/src/emu/bus/isa/hdc.h
index 6d211d3843f..0f9118dafa4 100644
--- a/src/emu/bus/isa/hdc.h
+++ b/src/emu/bus/isa/hdc.h
@@ -35,6 +35,7 @@ protected:
 		// device-level overrides
 		virtual void device_start();
 		virtual void device_reset();
+		virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
 private:
 		int drv;                            /* 0 master, 1 slave drive */
 		int cylinders[2];       /* number of cylinders */
@@ -84,8 +85,8 @@ protected:
 		void get_drive();
 		void get_chsn();
 		int test_ready();
-		TIMER_CALLBACK_MEMBER(hdc_command);
 public:
+		void hdc_command();
 		void pc_hdc_data_w(int data);
 		void pc_hdc_reset_w(int data);
 		void pc_hdc_select_w(int data);