amstrad: added preliminary Amstrad/Pace RS232C interface. The terminal

software included with the original Amstrad interface works, but not much else
does at this stage.  [Barry Rodewald]

Out of whatsnew:  HoneyTerm (part of the later Pace interface) expects bit 6
of RR0 on the Z80DART to be set (seems to unsupported in the current z80dart
device).  Not sure on why other software doesn't work as yet.

.gitattributes

@@ -753,6 +753,8 @@ src/emu/bus/cpc/cpc_pds.c svneol=native#text/plain
 src/emu/bus/cpc/cpc_pds.h svneol=native#text/plain
 src/emu/bus/cpc/cpc_rom.c svneol=native#text/plain
 src/emu/bus/cpc/cpc_rom.h svneol=native#text/plain
+src/emu/bus/cpc/cpc_rs232.c svneol=native#text/plain
+src/emu/bus/cpc/cpc_rs232.h svneol=native#text/plain
 src/emu/bus/cpc/cpc_ssa1.c svneol=native#text/plain
 src/emu/bus/cpc/cpc_ssa1.h svneol=native#text/plain
 src/emu/bus/cpc/cpcexp.c svneol=native#text/plain

src/emu/bus/bus.mak

@@ -974,6 +974,7 @@ BUSOBJS += $(BUSOBJ)/cpc/cpcexp.o
 BUSOBJS += $(BUSOBJ)/cpc/cpc_ssa1.o
 BUSOBJS += $(BUSOBJ)/cpc/cpc_rom.o
 BUSOBJS += $(BUSOBJ)/cpc/cpc_pds.o
+BUSOBJS += $(BUSOBJ)/cpc/cpc_rs232.o
 BUSOBJS += $(BUSOBJ)/cpc/mface2.o
 endif
 

src/emu/bus/cpc/cpc_rs232.c

@@ -0,0 +1,147 @@
+/*
+ * cpc_rs232.c
+ *
+ *  Created on: 22/04/2014
+ */
+
+#include "cpc_rs232.h"
+#include "includes/amstrad.h"
+
+//**************************************************************************
+//  DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type CPC_RS232 = &device_creator<cpc_rs232_device>;
+
+Z80DART_INTERFACE(dart_intf)
+{
+	0, //m_rxca;
+	0, //m_txca;
+	0, //m_rxcb;
+	0, //m_txcb;
+
+	DEVCB_DEVICE_LINE_MEMBER("rs232",rs232_port_device,write_txd), //m_out_txda_cb;
+	DEVCB_DEVICE_LINE_MEMBER("rs232",rs232_port_device,write_dtr), //m_out_dtra_cb;
+	DEVCB_DEVICE_LINE_MEMBER("rs232",rs232_port_device,write_rts), //m_out_rtsa_cb;
+	DEVCB_NULL, //m_out_wrdya_cb;
+	DEVCB_NULL, //m_out_synca_cb;
+
+	DEVCB_NULL, //m_out_txdb_cb;
+	DEVCB_NULL, //m_out_dtrb_cb;
+	DEVCB_NULL, //m_out_rtsb_cb;
+	DEVCB_NULL, //m_out_wrdyb_cb;
+	DEVCB_NULL, //m_out_syncb_cb;
+
+	DEVCB_NULL, //m_out_int_cb;
+	DEVCB_NULL, //m_out_rxdrqa_cb;
+	DEVCB_NULL, //m_out_txdrqa_cb;
+	DEVCB_NULL, //m_out_rxdrqb_cb;
+	DEVCB_NULL //m_out_txdrqb_cb;
+};
+
+
+// device machine config
+static MACHINE_CONFIG_FRAGMENT( cpc_rs232 )
+	MCFG_DEVICE_ADD("pit", PIT8253, 0)
+	MCFG_PIT8253_CLK0(2000000)
+	MCFG_PIT8253_CLK1(2000000)
+	MCFG_PIT8253_CLK2(2000000)
+	MCFG_PIT8253_OUT0_HANDLER(WRITELINE(cpc_rs232_device, pit_out0_w))
+	MCFG_PIT8253_OUT1_HANDLER(WRITELINE(cpc_rs232_device, pit_out1_w))
+	MCFG_PIT8253_OUT2_HANDLER(WRITELINE(cpc_rs232_device, pit_out2_w))
+
+	MCFG_Z80DART_ADD("dart", XTAL_4MHz, dart_intf)
+
+	MCFG_RS232_PORT_ADD("rs232",default_rs232_devices,NULL)
+	MCFG_RS232_RXD_HANDLER(DEVWRITELINE("dart",z80dart_device,rxa_w))
+	MCFG_RS232_DCD_HANDLER(DEVWRITELINE("dart",z80dart_device,dcda_w))
+	MCFG_RS232_CTS_HANDLER(DEVWRITELINE("dart",z80dart_device,ctsa_w))
+//	MCFG_RS232_RI_HANDLER(DEVWRITELINE("dart",z80dart_device,ria_w))
+
+	// pass-through
+	MCFG_DEVICE_ADD("exp", CPC_EXPANSION_SLOT, 0)
+	MCFG_DEVICE_SLOT_INTERFACE(cpc_exp_cards, NULL, false)
+	MCFG_CPC_EXPANSION_SLOT_OUT_IRQ_CB(DEVWRITELINE("^", cpc_expansion_slot_device, irq_w))
+	MCFG_CPC_EXPANSION_SLOT_OUT_NMI_CB(DEVWRITELINE("^", cpc_expansion_slot_device, nmi_w))
+	MCFG_CPC_EXPANSION_SLOT_OUT_ROMDIS_CB(DEVWRITELINE("^", cpc_expansion_slot_device, romdis_w))  // ROMDIS
+	MCFG_CPC_EXPANSION_SLOT_OUT_ROMEN_CB(DEVWRITELINE("^", cpc_expansion_slot_device, romen_w))  // /ROMEN
+
+MACHINE_CONFIG_END
+
+machine_config_constructor cpc_rs232_device::device_mconfig_additions() const
+{
+	return MACHINE_CONFIG_NAME( cpc_rs232 );
+}
+
+
+//**************************************************************************
+//  LIVE DEVICE
+//**************************************************************************
+
+cpc_rs232_device::cpc_rs232_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+	device_t(mconfig, CPC_RS232, "Amstrad/Pace RS232C interface", tag, owner, clock, "cpc_ser", __FILE__),
+	device_cpc_expansion_card_interface(mconfig, *this),
+	m_pit(*this,"pit"),
+	m_dart(*this,"dart"),
+	m_rs232(*this,"rs232")
+{
+}
+
+//-------------------------------------------------
+//  device_start - device-specific startup
+//-------------------------------------------------
+
+void cpc_rs232_device::device_start()
+{
+	device_t* cpu = machine().device("maincpu");
+	address_space& space = cpu->memory().space(AS_IO);
+	m_slot = dynamic_cast<cpc_expansion_slot_device *>(owner());
+
+	space.install_readwrite_handler(0xfadc,0xfadf,0,0,read8_delegate(FUNC(cpc_rs232_device::dart_r),this),write8_delegate(FUNC(cpc_rs232_device::dart_w),this));
+	space.install_readwrite_handler(0xfbdc,0xfbdf,0,0,read8_delegate(FUNC(cpc_rs232_device::pit_r),this),write8_delegate(FUNC(cpc_rs232_device::pit_w),this));
+}
+
+//-------------------------------------------------
+//  device_reset - device-specific reset
+//-------------------------------------------------
+
+void cpc_rs232_device::device_reset()
+{
+}
+
+
+WRITE_LINE_MEMBER(cpc_rs232_device::pit_out0_w)
+{
+	m_dart->txca_w(state);
+}
+
+WRITE_LINE_MEMBER(cpc_rs232_device::pit_out1_w)
+{
+	m_dart->rxca_w(state);
+}
+
+WRITE_LINE_MEMBER(cpc_rs232_device::pit_out2_w)
+{
+	m_dart->txcb_w(state);
+	m_dart->rxcb_w(state);
+}
+
+READ8_MEMBER(cpc_rs232_device::dart_r)
+{
+	return m_dart->ba_cd_r(space,offset);
+}
+
+WRITE8_MEMBER(cpc_rs232_device::dart_w)
+{
+	m_dart->ba_cd_w(space,offset,data);
+}
+
+READ8_MEMBER(cpc_rs232_device::pit_r)
+{
+	return m_pit->read(space,offset);
+}
+
+WRITE8_MEMBER(cpc_rs232_device::pit_w)
+{
+	m_pit->write(space,offset,data);
+}

src/emu/bus/cpc/cpc_rs232.h

@@ -0,0 +1,50 @@
+/*
+ * cpc_rs232.h
+ *
+ *  Created on: 22/04/2014
+ */
+
+#ifndef CPC_RS232_H_
+#define CPC_RS232_H_
+
+#include "emu.h"
+#include "machine/z80dart.h"
+#include "machine/pit8253.h"
+#include "bus/rs232/rs232.h"
+#include "cpcexp.h"
+
+class cpc_rs232_device : public device_t,
+					 	 public device_cpc_expansion_card_interface
+{
+public:
+	// construction/destruction
+	cpc_rs232_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+	// optional information overrides
+	virtual machine_config_constructor device_mconfig_additions() const;
+
+	DECLARE_WRITE_LINE_MEMBER(pit_out0_w);
+	DECLARE_WRITE_LINE_MEMBER(pit_out1_w);
+	DECLARE_WRITE_LINE_MEMBER(pit_out2_w);
+
+	DECLARE_READ8_MEMBER(dart_r);
+	DECLARE_WRITE8_MEMBER(dart_w);
+	DECLARE_READ8_MEMBER(pit_r);
+	DECLARE_WRITE8_MEMBER(pit_w);
+
+	required_device<pit8253_device> m_pit;
+	required_device<z80dart_device> m_dart;
+	required_device<rs232_port_device> m_rs232;
+protected:
+	// device-level overrides
+	virtual void device_start();
+	virtual void device_reset();
+
+private:
+	cpc_expansion_slot_device *m_slot;
+};
+
+// device type definition
+extern const device_type CPC_RS232;
+
+#endif /* CPC_RS232_H_ */

src/mess/drivers/amstrad.c

@@ -835,6 +835,7 @@ SLOT_INTERFACE_START(cpc_exp_cards)
 	SLOT_INTERFACE("rom", CPC_ROM)
 	SLOT_INTERFACE("multiface2", CPC_MFACE2)
 	SLOT_INTERFACE("pds", CPC_PDS)
+	SLOT_INTERFACE("rs232", CPC_RS232)
 SLOT_INTERFACE_END
 
 SLOT_INTERFACE_START(cpcplus_exp_cards)
@@ -842,6 +843,7 @@ SLOT_INTERFACE_START(cpcplus_exp_cards)
 	SLOT_INTERFACE("dkspeech", CPC_DKSPEECH)
 	SLOT_INTERFACE("rom", CPC_ROM)
 	SLOT_INTERFACE("pds", CPC_PDS)
+	SLOT_INTERFACE("rs232", CPC_RS232)
 SLOT_INTERFACE_END
 
 static MACHINE_CONFIG_START( amstrad_nofdc, amstrad_state )

src/mess/includes/amstrad.h

@@ -19,6 +19,7 @@
 #include "bus/cpc/cpc_rom.h"
 #include "bus/cpc/mface2.h"
 #include "bus/cpc/cpc_pds.h"
+#include "bus/cpc/cpc_rs232.h"
 #include "machine/ram.h"
 #include "imagedev/cassette.h"
 #include "bus/centronics/ctronics.h"