From 30a0f6567e1ffa9c81d362fe25400e60ad8f554f Mon Sep 17 00:00:00 2001
From: Curt Coder <curtcoder@mail.com>
Date: Tue, 7 Apr 2015 15:29:44 +0300
Subject: [PATCH] z80pio: Added individual write line handlers for port bits.
 [Curt Coder]

---
 src/emu/machine/z80pio.c | 44 +++++++++-------------------------------
 src/emu/machine/z80pio.h | 44 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+), 34 deletions(-)

diff --git a/src/emu/machine/z80pio.c b/src/emu/machine/z80pio.c
index 12525ee93ec..b53b3fe6158 100644
--- a/src/emu/machine/z80pio.c
+++ b/src/emu/machine/z80pio.c
@@ -28,30 +28,6 @@
 
 #define LOG 0
 
-enum
-{
-	MODE_OUTPUT = 0,
-	MODE_INPUT,
-	MODE_BIDIRECTIONAL,
-	MODE_BIT_CONTROL
-};
-
-enum
-{
-	ANY = 0,
-	IOR,
-	MASK
-};
-
-const int ICW_ENABLE_INT    = 0x80;
-//const int ICW_AND_OR        = 0x40;
-//const int ICW_AND           = 0x40;
-//const int ICW_OR            = 0x00;
-//const int ICW_HIGH_LOW      = 0x20;
-//const int ICW_HIGH          = 0x20;
-//const int ICW_LOW           = 0x00;
-const int ICW_MASK_FOLLOWS  = 0x10;
-
 
 
 //**************************************************************************
@@ -65,16 +41,16 @@ const device_type Z80PIO = &device_creator<z80pio_device>;
 //  z80pio_device - constructor
 //-------------------------------------------------
 
-z80pio_device::z80pio_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
-	: device_t(mconfig, Z80PIO, "Z80 PIO", tag, owner, clock, "z80pio", __FILE__),
-		device_z80daisy_interface(mconfig, *this),
-		m_out_int_cb(*this),
-		m_in_pa_cb(*this),
-		m_out_pa_cb(*this),
-		m_out_ardy_cb(*this),
-		m_in_pb_cb(*this),
-		m_out_pb_cb(*this),
-		m_out_brdy_cb(*this)
+z80pio_device::z80pio_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+	device_t(mconfig, Z80PIO, "Z80 PIO", tag, owner, clock, "z80pio", __FILE__),
+	device_z80daisy_interface(mconfig, *this),
+	m_out_int_cb(*this),
+	m_in_pa_cb(*this),
+	m_out_pa_cb(*this),
+	m_out_ardy_cb(*this),
+	m_in_pb_cb(*this),
+	m_out_pb_cb(*this),
+	m_out_brdy_cb(*this)
 {
 }
 
diff --git a/src/emu/machine/z80pio.h b/src/emu/machine/z80pio.h
index f82786174d8..c27ac4ecba1 100644
--- a/src/emu/machine/z80pio.h
+++ b/src/emu/machine/z80pio.h
@@ -118,6 +118,7 @@ public:
 	// port I/O
 	UINT8 port_read(int offset) { return m_port[offset & 1].read(); }
 	void port_write(int offset, UINT8 data) { m_port[offset & 1].write(data); }
+	void port_write(int offset, int bit, int state) { port_write(offset, (m_port[offset & 1].m_input & ~(1 << bit)) | (state << bit));  }
 	UINT8 port_a_read() { return port_read(PORT_A); }
 	UINT8 port_b_read() { return port_read(PORT_B); }
 	void port_a_write(UINT8 data) { port_write(PORT_A, data); }
@@ -126,6 +127,22 @@ public:
 	DECLARE_READ8_MEMBER( pa_r ) { return port_a_read(); }
 	DECLARE_WRITE8_MEMBER( pb_w ) { port_b_write(data); }
 	DECLARE_READ8_MEMBER( pb_r ) { return port_b_read(); }
+	DECLARE_WRITE_LINE_MEMBER( pa0_w ) { port_write(PORT_A, 0, state); }
+	DECLARE_WRITE_LINE_MEMBER( pa1_w ) { port_write(PORT_A, 1, state); }
+	DECLARE_WRITE_LINE_MEMBER( pa2_w ) { port_write(PORT_A, 2, state); }
+	DECLARE_WRITE_LINE_MEMBER( pa3_w ) { port_write(PORT_A, 3, state); }
+	DECLARE_WRITE_LINE_MEMBER( pa4_w ) { port_write(PORT_A, 4, state); }
+	DECLARE_WRITE_LINE_MEMBER( pa5_w ) { port_write(PORT_A, 5, state); }
+	DECLARE_WRITE_LINE_MEMBER( pa6_w ) { port_write(PORT_A, 6, state); }
+	DECLARE_WRITE_LINE_MEMBER( pa7_w ) { port_write(PORT_A, 7, state); }
+	DECLARE_WRITE_LINE_MEMBER( pb0_w ) { port_write(PORT_B, 0, state); }
+	DECLARE_WRITE_LINE_MEMBER( pb1_w ) { port_write(PORT_B, 1, state); }
+	DECLARE_WRITE_LINE_MEMBER( pb2_w ) { port_write(PORT_B, 2, state); }
+	DECLARE_WRITE_LINE_MEMBER( pb3_w ) { port_write(PORT_B, 3, state); }
+	DECLARE_WRITE_LINE_MEMBER( pb4_w ) { port_write(PORT_B, 4, state); }
+	DECLARE_WRITE_LINE_MEMBER( pb5_w ) { port_write(PORT_B, 5, state); }
+	DECLARE_WRITE_LINE_MEMBER( pb6_w ) { port_write(PORT_B, 6, state); }
+	DECLARE_WRITE_LINE_MEMBER( pb7_w ) { port_write(PORT_B, 7, state); }
 
 	// standard read/write, with C/D in bit 1, B/A in bit 0
 	DECLARE_READ8_MEMBER( read );
@@ -136,6 +153,33 @@ public:
 	DECLARE_WRITE8_MEMBER( write_alt );
 
 private:
+	enum
+	{
+		MODE_OUTPUT = 0,
+		MODE_INPUT,
+		MODE_BIDIRECTIONAL,
+		MODE_BIT_CONTROL
+	};
+
+	enum
+	{
+		ANY = 0,
+		IOR,
+		MASK
+	};
+
+	enum
+	{
+		ICW_ENABLE_INT    = 0x80,
+		ICW_AND_OR        = 0x40,
+		ICW_AND           = 0x40,
+		ICW_OR            = 0x00,
+		ICW_HIGH_LOW      = 0x20,
+		ICW_HIGH          = 0x20,
+		ICW_LOW           = 0x00,
+		ICW_MASK_FOLLOWS  = 0x10
+	};
+
 	// device-level overrides
 	virtual void device_start();
 	virtual void device_reset();