diff --git a/src/emu/machine/mccs1850.c b/src/emu/machine/mccs1850.c
index 4477985f318..d8c06b06ef5 100644
--- a/src/emu/machine/mccs1850.c
+++ b/src/emu/machine/mccs1850.c
@@ -294,7 +294,7 @@ mccs1850_device::mccs1850_device(const machine_config &mconfig, const char *tag,
 {
 }
 
-void mccs1850_device::set_cb(cb_t _int_cb, cb_t _pse_cb, cb_t _nuc_cb)
+void mccs1850_device::set_cb(line_cb_t _int_cb, line_cb_t _pse_cb, line_cb_t _nuc_cb)
 {
 	int_cb = _int_cb;
 	pse_cb = _pse_cb;
diff --git a/src/emu/machine/mccs1850.h b/src/emu/machine/mccs1850.h
index 7a1427847e7..6ad4e669f2e 100644
--- a/src/emu/machine/mccs1850.h
+++ b/src/emu/machine/mccs1850.h
@@ -47,11 +47,9 @@ class mccs1850_device :	public device_t,
 						public device_nvram_interface
 {
 public:
-	typedef delegate<void (bool state)> cb_t;
-
     // construction/destruction
     mccs1850_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
-	void set_cb(cb_t int_cb, cb_t pse_cb, cb_t nuc_cb);
+	void set_cb(line_cb_t int_cb, line_cb_t pse_cb, line_cb_t nuc_cb);
 
 	DECLARE_WRITE_LINE_MEMBER( ce_w );
 	DECLARE_WRITE_LINE_MEMBER( sck_w );
@@ -85,7 +83,7 @@ private:
 
 	static const device_timer_id TIMER_CLOCK = 0;
 
-	cb_t int_cb, pse_cb, nuc_cb;
+	line_cb_t int_cb, pse_cb, nuc_cb;
 
 	UINT8 m_ram[0x80];			// RAM