diff --git a/src/emu/cpu/mcs48/mcs48.h b/src/emu/cpu/mcs48/mcs48.h
index 67a45704ded..52a32815bda 100644
--- a/src/emu/cpu/mcs48/mcs48.h
+++ b/src/emu/cpu/mcs48/mcs48.h
@@ -87,6 +87,9 @@ enum
     MACROS
 ***************************************************************************/
 
+#define MCS48_LC_CLOCK(_L, _C) \
+    (1 / (2 * 3.14159265358979323846 * sqrt(_L * _C)))
+
 #define MCS48_ALE_CLOCK(_clock) \
 	attotime::from_hz(_clock/(3*5))
 
diff --git a/src/emu/machine/rescap.h b/src/emu/machine/rescap.h
index e751623ae6d..73b69a06746 100644
--- a/src/emu/machine/rescap.h
+++ b/src/emu/machine/rescap.h
@@ -8,6 +8,9 @@
 #define CAP_U(cap) ((double)(cap) * 1e-6)
 #define CAP_N(cap) ((double)(cap) * 1e-9)
 #define CAP_P(cap) ((double)(cap) * 1e-12)
+#define IND_U(ind) ((double)(ind) * 1e-6)
+#define IND_N(ind) ((double)(ind) * 1e-9)
+#define IND_P(ind) ((double)(ind) * 1e-12)
 
 /*  vin --/\r1/\-- out --/\r2/\-- gnd  */
 #define RES_VOLTAGE_DIVIDER(r1, r2)     ((double)(r2) / ((double)(r1) + (double)(r2)))
diff --git a/src/mess/machine/kb_pcxt83.c b/src/mess/machine/kb_pcxt83.c
index 674897eedc6..3a05a3ca25e 100644
--- a/src/mess/machine/kb_pcxt83.c
+++ b/src/mess/machine/kb_pcxt83.c
@@ -1,6 +1,6 @@
 /**********************************************************************
 
-    IBM PC/XT 5150/5160 83-key keyboard emulation
+    IBM Model F PC/XT 5150/5160 83-key keyboard emulation
 
     Copyright MESS Team.
     Visit http://mamedev.org for licensing and usage restrictions.
@@ -33,6 +33,8 @@ const device_type PC_KBD_IBM_PC_XT_83 = &device_creator<ibm_pc_xt_83_keyboard_de
 ROM_START( ibm_pc_xt_83_keyboard )
 	ROM_REGION( 0x400, I8048_TAG, 0 )
 	/*
+	Keyboard Part No. 1501105
+
 	MOI 74 01
 	PN 4584751
 	GX 344231
@@ -61,6 +63,10 @@ const rom_entry *ibm_pc_xt_83_keyboard_device::device_rom_region() const
 //-------------------------------------------------
 
 static ADDRESS_MAP_START( ibm_pc_xt_83_keyboard_io, AS_IO, 8, ibm_pc_xt_83_keyboard_device )
+	AM_RANGE(MCS48_PORT_BUS, MCS48_PORT_BUS) AM_WRITE(bus_w)
+	AM_RANGE(MCS48_PORT_P1, MCS48_PORT_P1) AM_READ(p1_r) AM_WRITENOP
+	AM_RANGE(MCS48_PORT_P2, MCS48_PORT_P2) AM_WRITE(p2_w)
+	AM_RANGE(MCS48_PORT_T1, MCS48_PORT_T1) AM_READ(t1_r)
 ADDRESS_MAP_END
 
 
@@ -69,7 +75,7 @@ ADDRESS_MAP_END
 //-------------------------------------------------
 
 static MACHINE_CONFIG_FRAGMENT( ibm_pc_xt_83_keyboard )
-	MCFG_CPU_ADD(I8048_TAG, I8048, 4000000)
+	MCFG_CPU_ADD(I8048_TAG, I8048, MCS48_LC_CLOCK(IND_U(47), CAP_P(20)))
 	MCFG_CPU_IO_MAP(ibm_pc_xt_83_keyboard_io)
 MACHINE_CONFIG_END
 
@@ -126,6 +132,9 @@ ibm_pc_xt_83_keyboard_device::ibm_pc_xt_83_keyboard_device(const machine_config
 
 void ibm_pc_xt_83_keyboard_device::device_start()
 {
+	// state saving
+	save_item(NAME(m_cnt));
+	save_item(NAME(m_key_depressed));
 }
 
 
@@ -135,22 +144,81 @@ void ibm_pc_xt_83_keyboard_device::device_start()
 
 void ibm_pc_xt_83_keyboard_device::device_reset()
 {
+	m_maincpu->reset();
 }
 
 
 //-------------------------------------------------
-//  clock_write -
+//  bus_w -
 //-------------------------------------------------
 
-WRITE_LINE_MEMBER( ibm_pc_xt_83_keyboard_device::clock_write )
+WRITE8_MEMBER( ibm_pc_xt_83_keyboard_device::bus_w )
 {
+	m_cnt = data;
 }
 
 
 //-------------------------------------------------
-//  data_write -
+//  p1_r -
 //-------------------------------------------------
 
-WRITE_LINE_MEMBER( ibm_pc_xt_83_keyboard_device::data_write )
+READ8_MEMBER( ibm_pc_xt_83_keyboard_device::p1_r )
 {
+	/*
+	
+	    bit     description
+	
+	    0       -REQ IN
+	    1       DATA IN
+	    2       
+	    3       
+	    4       
+	    5       
+	    6       
+	    7       
+	
+	*/
+	
+	UINT8 data = 0;
+
+	data |= clock_signal();
+	data |= data_signal() << 1;
+
+	return data;
+}
+
+
+//-------------------------------------------------
+//  p2_w -
+//-------------------------------------------------
+
+WRITE8_MEMBER( ibm_pc_xt_83_keyboard_device::p2_w )
+{
+	/*
+	
+	    bit     description
+	
+	    0       -MATRIX STROBE
+	    1       CLOCK OUT
+	    2       DATA OUT
+	    3       
+	    4       
+	    5       
+	    6       
+	    7       
+	
+	*/
+
+	m_pc_kbdc->clock_write_from_kb(BIT(data, 1));
+	m_pc_kbdc->data_write_from_kb(BIT(data, 2));
+}
+
+
+//-------------------------------------------------
+//  t1_r -
+//-------------------------------------------------
+
+READ8_MEMBER( ibm_pc_xt_83_keyboard_device::t1_r )
+{
+	return m_key_depressed;
 }
diff --git a/src/mess/machine/kb_pcxt83.h b/src/mess/machine/kb_pcxt83.h
index 042e1698685..7a9aa3bd579 100644
--- a/src/mess/machine/kb_pcxt83.h
+++ b/src/mess/machine/kb_pcxt83.h
@@ -1,6 +1,6 @@
 /**********************************************************************
 
-    IBM PC/XT 5150/5160 83-key keyboard emulation
+    IBM Model F PC/XT 5150/5160 83-key keyboard emulation
 
     Copyright MESS Team.
     Visit http://mamedev.org for licensing and usage restrictions.
@@ -15,6 +15,7 @@
 #include "emu.h"
 #include "cpu/mcs48/mcs48.h"
 #include "machine/pc_kbdc.h"
+#include "machine/rescap.h"
 
 
 
@@ -36,17 +37,25 @@ public:
 	virtual machine_config_constructor device_mconfig_additions() const;
 	virtual ioport_constructor device_input_ports() const;
 
+	DECLARE_WRITE8_MEMBER( bus_w );
+	DECLARE_READ8_MEMBER( p1_r );
+	DECLARE_WRITE8_MEMBER( p2_w );
+	DECLARE_READ8_MEMBER( t1_r );
+
 protected:
 	// device-level overrides
 	virtual void device_start();
 	virtual void device_reset();
 
 	// device_pc_kbd_interface overrides
-	virtual DECLARE_WRITE_LINE_MEMBER( clock_write );
-	virtual DECLARE_WRITE_LINE_MEMBER( data_write );
+	virtual DECLARE_WRITE_LINE_MEMBER( clock_write ) { };
+	virtual DECLARE_WRITE_LINE_MEMBER( data_write ) { };
 
 private:
 	required_device<cpu_device> m_maincpu;
+
+	UINT8 m_cnt;
+	int m_key_depressed;
 };
 
 
diff --git a/src/mess/machine/pc_keyboards.h b/src/mess/machine/pc_keyboards.h
index e4462c69d3b..c7c3cd19726 100644
--- a/src/mess/machine/pc_keyboards.h
+++ b/src/mess/machine/pc_keyboards.h
@@ -10,7 +10,7 @@
 
 // PC XT protocol keyboards
 #define STR_KBD_KEYTRONIC_PC3270    "keytronc_pc3270"
-#define STR_KBD_IBM_PC_XT_83		"pcxt83"
+#define STR_KBD_IBM_PC_XT_83		"pcxt"
 
 SLOT_INTERFACE_EXTERN(pc_xt_keyboards);