Amiga: Add keyboard reset circuit. You can now reset the Amiga with the

usual Ctrl-Amiga-Amiga key combination.

src/mame/includes/amiga.h

@@ -437,6 +437,7 @@ public:
 	DECLARE_CUSTOM_INPUT_MEMBER( floppy_drive_status );
 
 	DECLARE_WRITE_LINE_MEMBER( m68k_reset );
+	DECLARE_WRITE_LINE_MEMBER( kbreset_w );
 
 	DECLARE_READ16_MEMBER( cia_r );
 	DECLARE_WRITE16_MEMBER( cia_w );

src/mame/machine/amiga.c

@@ -268,6 +268,17 @@ void amiga_state::machine_reset()
 	m_overlay->set_bank(1);
 }
 
+WRITE_LINE_MEMBER( amiga_state::kbreset_w )
+{
+	// this is connected to the gary chip, gary then resets the 68k, agnus, paula and the cias
+	if (!state)
+	{
+		m_sound->reset();
+		machine_reset();
+		m_maincpu->reset();
+	}
+}
+
 // simple mirror of region 0xf80000 to 0xfbffff
 READ16_MEMBER( amiga_state::rom_mirror_r )
 {

src/mess/drivers/amiga.c

@@ -1293,6 +1293,7 @@ static MACHINE_CONFIG_START( amiga_base, amiga_state )
 	MCFG_DEVICE_ADD("kbd", AMIGAKBD, 0)
 	MCFG_AMIGA_KEYBOARD_KCLK_CALLBACK(DEVWRITELINE("cia_0", mos8520_device, cnt_w))
 	MCFG_AMIGA_KEYBOARD_KDAT_CALLBACK(DEVWRITELINE("cia_0", mos8520_device, sp_w))
+	MCFG_AMIGA_KEYBOARD_KRST_CALLBACK(WRITELINE(amiga_state, kbreset_w))
 
 	// software
 	MCFG_SOFTWARE_LIST_ADD("wb_list", "amiga_workbench")

src/mess/machine/amigakbd.c

@@ -18,6 +18,7 @@
 ***************************************************************************/
 
 #include "amigakbd.h"
+#include "machine/rescap.h"
 
 
 //**************************************************************************
@@ -79,11 +80,11 @@ const rom_entry *amigakbd_device::device_rom_region() const
 static INPUT_PORTS_START( a500_us_keyboard )
 	PORT_START("special")
 	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNUSED)
-	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LWIN)      PORT_CHAR(UCHAR_MAMEKEY(LWIN))      PORT_NAME("Left Amiga")
+	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LWIN)      PORT_CHAR(UCHAR_MAMEKEY(LWIN))      PORT_NAME("Left Amiga")  PORT_CHANGED_MEMBER(DEVICE_SELF, amigakbd_device, check_reset, NULL)
 	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LALT)      PORT_CHAR(UCHAR_MAMEKEY(LALT))
 	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LSHIFT)    PORT_CHAR(UCHAR_SHIFT_1)
-	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LCONTROL)  PORT_CHAR(UCHAR_SHIFT_2)            PORT_NAME("Ctrl")
+	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LCONTROL)  PORT_CHAR(UCHAR_SHIFT_2)            PORT_NAME("Ctrl")        PORT_CHANGED_MEMBER(DEVICE_SELF, amigakbd_device, check_reset, NULL)
-	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_RWIN)      PORT_CHAR(UCHAR_MAMEKEY(RWIN))      PORT_NAME("Right Amiga")
+	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_RWIN)      PORT_CHAR(UCHAR_MAMEKEY(RWIN))      PORT_NAME("Right Amiga") PORT_CHANGED_MEMBER(DEVICE_SELF, amigakbd_device, check_reset, NULL)
 	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_RALT)      PORT_CHAR(UCHAR_MAMEKEY(RALT))
 	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_RSHIFT)    PORT_CHAR(UCHAR_SHIFT_1)
 
@@ -256,7 +257,9 @@ amigakbd_device::amigakbd_device(const machine_config &mconfig, const char *tag,
 	: device_t(mconfig, AMIGAKBD, "Amiga 500 Keyboard with 6570-036 MPU", tag, owner, clock, "amigakbd", __FILE__),
 	m_write_kclk(*this),
 	m_write_kdat(*this),
+	m_write_krst(*this),
 	m_mpu(*this, "mos6570_036"),
+	m_special(*this, "special"),
 	m_row_d6(*this, "row_d6"),
 	m_row_d5(*this, "row_d5"),
 	m_row_d4(*this, "row_d4"),
@@ -274,6 +277,7 @@ amigakbd_device::amigakbd_device(const machine_config &mconfig, const char *tag,
 	m_row_c0(*this, "row_c0"),
 	m_timer(NULL),
 	m_watchdog(NULL),
+	m_reset(NULL),
 	m_kdat(1),
 	m_kclk(1),
 	m_port_c(0xff),
@@ -292,8 +296,10 @@ void amigakbd_device::device_start()
 {
 	m_write_kclk.resolve_safe();
 	m_write_kdat.resolve_safe();
+	m_write_krst.resolve_safe();
 	m_timer = timer_alloc(0, NULL);
 	m_watchdog = timer_alloc(1, NULL);
+	m_reset = timer_alloc(2, NULL);
 }
 
 //-------------------------------------------------
@@ -321,6 +327,7 @@ void amigakbd_device::device_timer(emu_timer &timer, device_timer_id tid, int pa
 {
 	switch (tid)
 	{
+	// 6500/1 internal timer
 	case 0:
 		switch (m_control & 0x03)
 		{
@@ -348,10 +355,16 @@ void amigakbd_device::device_timer(emu_timer &timer, device_timer_id tid, int pa
 		}
 		break;
 
+	// watchdog
 	case 1:
 		m_mpu->reset();
 		m_watchdog->adjust(attotime::from_msec(54));
 		break;
+
+	// keyboard reset timer
+	case 2:
+		m_write_krst(1);
+		break;
 	}
 }
 
@@ -360,6 +373,18 @@ void amigakbd_device::device_timer(emu_timer &timer, device_timer_id tid, int pa
 //  IMPLEMENTATION
 //**************************************************************************
 
+INPUT_CHANGED_MEMBER( amigakbd_device::check_reset )
+{
+	UINT8 keys = m_special->read();
+
+	// ctrl-amiga-amiga pressed?
+	if (!BIT(keys, 6) && !BIT(keys, 3) && !BIT(keys, 2))
+	{
+		m_write_krst(0);
+		m_reset->adjust(PERIOD_OF_555_MONOSTABLE(RES_K(47), CAP_U(10)));
+	}
+}
+
 void amigakbd_device::update_irqs()
 {
 	if ((m_control & PA1_INT_ENABLED) && (m_control & PA1_NEGATIVE_EDGE))

src/mess/machine/amigakbd.h

@@ -29,6 +29,9 @@
 #define MCFG_AMIGA_KEYBOARD_KDAT_CALLBACK(_write) \
 	devcb = &amigakbd_device::set_kdat_wr_callback(*device, DEVCB_##_write);
 
+#define MCFG_AMIGA_KEYBOARD_KRST_CALLBACK(_write) \
+	devcb = &amigakbd_device::set_krst_wr_callback(*device, DEVCB_##_write);
+
 
 //**************************************************************************
 //  TYPE DEFINITIONS
@@ -46,6 +49,8 @@ public:
 		{ return downcast<amigakbd_device &>(device).m_write_kclk.set_callback(object); }
 	template<class _Object> static devcb_base &set_kdat_wr_callback(device_t &device, _Object object)
 		{ return downcast<amigakbd_device &>(device).m_write_kdat.set_callback(object); }
+	template<class _Object> static devcb_base &set_krst_wr_callback(device_t &device, _Object object)
+		{ return downcast<amigakbd_device &>(device).m_write_krst.set_callback(object); }
 
 	DECLARE_WRITE_LINE_MEMBER( kdat_w );
 
@@ -64,6 +69,8 @@ public:
 	DECLARE_READ8_MEMBER( control_r );
 	DECLARE_WRITE8_MEMBER( control_w );
 
+	DECLARE_INPUT_CHANGED_MEMBER( check_reset );
+
 protected:
 	// device-level overrides
 	virtual const rom_entry *device_rom_region() const;
@@ -97,9 +104,11 @@ private:
 
 	devcb_write_line m_write_kclk;
 	devcb_write_line m_write_kdat;
+	devcb_write_line m_write_krst;
 
 	required_device<m6502_device> m_mpu;
 
+	required_ioport m_special;
 	required_ioport m_row_d6;
 	required_ioport m_row_d5;
 	required_ioport m_row_d4;
@@ -118,6 +127,7 @@ private:
 
 	emu_timer *m_timer;
 	emu_timer *m_watchdog;
+	emu_timer *m_reset;
 
 	int m_kdat;
 	int m_kclk;