diff --git a/src/mame/drivers/rainbow.cpp b/src/mame/drivers/rainbow.cpp
index b3e830c9800..3ac6560a199 100644
--- a/src/mame/drivers/rainbow.cpp
+++ b/src/mame/drivers/rainbow.cpp
@@ -903,7 +903,7 @@ void rainbow_state::machine_reset()
 	INT88 = false;
 
 	m_kbd_tx_ready = m_kbd_rx_ready = false;
-	m_kbd8251->write_cts(1);
+	m_kbd8251->write_cts(0);
 	m_KBD = 0;
 
 	m_irq_high = 0;
diff --git a/src/mame/machine/dec_lk201.cpp b/src/mame/machine/dec_lk201.cpp
index ca640dc7add..dc3b07f7d2d 100644
--- a/src/mame/machine/dec_lk201.cpp
+++ b/src/mame/machine/dec_lk201.cpp
@@ -192,6 +192,7 @@ static ADDRESS_MAP_START( lk201_map, AS_PROGRAM, 8, lk201_device )
 	AM_RANGE(0x0004, 0x0006) AM_READWRITE(ddr_r, ddr_w)
 	AM_RANGE(0x000a, 0x000c) AM_READWRITE(spi_r, spi_w)
 	AM_RANGE(0x000d, 0x0011) AM_READWRITE(sci_r, sci_w)
+	AM_RANGE(0x0012, 0x001b) AM_READWRITE(timer_r, timer_w)
 	AM_RANGE(0x0050, 0x00ff) AM_RAM
 	AM_RANGE(0x0100, 0x1fff) AM_ROM AM_REGION(LK201_CPU_TAG, 0x100)
 ADDRESS_MAP_END
@@ -495,6 +496,7 @@ lk201_device::lk201_device(const machine_config &mconfig, const char *tag, devic
 
 void lk201_device::device_start()
 {
+	m_count = timer_alloc(1);
 	m_tx_handler.resolve_safe();
 }
 
@@ -507,6 +509,8 @@ void lk201_device::device_reset()
 {
 	set_data_frame(1, 8, PARITY_NONE, STOP_BITS_1);
 	set_rate(4800);
+	m_count->adjust(attotime::from_hz(1200), 0, attotime::from_hz(1200));
+	memset(m_timer.regs, 0, sizeof(m_timer.regs));
 
 	sci_status = (SCSR_TC | SCSR_TDRE);
 
@@ -522,7 +526,14 @@ void lk201_device::device_reset()
 
 void lk201_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
 {
-	device_serial_interface::device_timer(timer, id, param, ptr);
+	if(id == 1)
+	{
+		if(m_timer.tcr & 0x40)
+			m_maincpu->set_input_line(M68HC05EG_INT_TIMER, ASSERT_LINE);
+		m_timer.tsr |= 0x40;
+	}
+	else
+		device_serial_interface::device_timer(timer, id, param, ptr);
 }
 
 void lk201_device::rcv_complete()
@@ -556,6 +567,22 @@ void lk201_device::update_interrupts()
 	}
 }
 
+READ8_MEMBER( lk201_device::timer_r )
+{
+	UINT8 ret = m_timer.regs[offset];
+	if(m_timer.tsr)
+	{
+		m_timer.tsr = 0;
+		m_maincpu->set_input_line(M68HC05EG_INT_TIMER, CLEAR_LINE);
+	}
+	return ret;
+}
+
+WRITE8_MEMBER( lk201_device::timer_w )
+{
+	m_timer.regs[offset] = data;
+}
+
 READ8_MEMBER( lk201_device::ddr_r )
 {
 	return ddrs[offset];
diff --git a/src/mame/machine/dec_lk201.h b/src/mame/machine/dec_lk201.h
index 88271331523..0871f1c3c4e 100644
--- a/src/mame/machine/dec_lk201.h
+++ b/src/mame/machine/dec_lk201.h
@@ -53,6 +53,8 @@ public:
 	DECLARE_WRITE8_MEMBER( sci_w );
 	DECLARE_READ8_MEMBER( spi_r );
 	DECLARE_WRITE8_MEMBER( spi_w );
+	DECLARE_READ8_MEMBER( timer_r );
+	DECLARE_WRITE8_MEMBER( timer_w );
 
 	template<class _Object> static devcb_base &set_tx_handler(device_t &device, _Object wr) { return downcast<lk201_device &>(device).m_tx_handler.set_callback(wr); }
 
@@ -76,6 +78,24 @@ private:
 	UINT8 led_data;
 	UINT8 kbd_data;
 
+	union {
+		struct {
+			UINT8 tcr;
+			UINT8 tsr;
+			UINT8 icrh;
+			UINT8 icrl;
+			UINT8 ocrh;
+			UINT8 ocrl;
+			UINT8 crh;
+			UINT8 crl;
+			UINT8 acrh;
+			UINT8 acrl;
+		};
+		UINT8 regs[10];
+	} m_timer;
+
+	emu_timer *m_count;
+
 	UINT8 sci_ctl2;
 	UINT8 sci_status;
 	//UINT8 sci_data;