amstrad: Added a basic implementation of the Programmers Development System hardware for the CPC. Only lacks a way to set up a parallel connection between MESS instances to enable PC<->CPC communication. [Barry Rodewald]

.gitattributes

@@ -7926,6 +7926,8 @@ src/mess/machine/concept.c svneol=native#text/plain
 src/mess/machine/concept_exp.c svneol=native#text/plain
 src/mess/machine/concept_exp.h svneol=native#text/plain
 src/mess/machine/corvushd.c svneol=native#text/plain
+src/mess/machine/cpc_pds.c svneol=native#text/plain
+src/mess/machine/cpc_pds.h svneol=native#text/plain
 src/mess/machine/cpc_rom.c svneol=native#text/plain
 src/mess/machine/cpc_rom.h svneol=native#text/plain
 src/mess/machine/cpc_ssa1.c svneol=native#text/plain

src/mess/drivers/amstrad.c

@@ -860,12 +860,14 @@ SLOT_INTERFACE_START(cpc_exp_cards)
 	SLOT_INTERFACE("dkspeech", CPC_DKSPEECH)
 	SLOT_INTERFACE("rom", CPC_ROM)
 	SLOT_INTERFACE("multiface2", CPC_MFACE2)
+	SLOT_INTERFACE("pds", CPC_PDS)
 SLOT_INTERFACE_END
 
 SLOT_INTERFACE_START(cpcplus_exp_cards)
 	SLOT_INTERFACE("ssa1", CPC_SSA1)
 	SLOT_INTERFACE("dkspeech", CPC_DKSPEECH)
 	SLOT_INTERFACE("rom", CPC_ROM)
+	SLOT_INTERFACE("pds", CPC_PDS)
 SLOT_INTERFACE_END
 
 static MACHINE_CONFIG_START( amstrad_nofdc, amstrad_state )

src/mess/includes/amstrad.h

@@ -18,6 +18,7 @@
 #include "machine/cpc_ssa1.h"
 #include "machine/cpc_rom.h"
 #include "machine/mface2.h"
+#include "machine/cpc_pds.h"
 #include "machine/ram.h"
 #include "imagedev/cassette.h"
 #include "bus/centronics/ctronics.h"

src/mess/machine/cpc_pds.c

@@ -0,0 +1,87 @@
+/*
+ * cpc_pds.c  --  CPC interface hardware for the Programmers Development System
+ *
+ *  Created on: 10/02/2014
+ */
+
+#include "emu.h"
+#include "cpc_pds.h"
+#include "includes/amstrad.h"
+
+
+//**************************************************************************
+//  DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type CPC_PDS = &device_creator<cpc_pds_device>;
+
+
+static Z80PIO_INTERFACE( pio_intf )
+{
+	DEVCB_NULL, //m_out_int_cb;
+
+	DEVCB_NULL, //m_in_pa_cb;
+	DEVCB_NULL, //m_out_pa_cb;
+	DEVCB_NULL, //m_out_ardy_cb;
+
+	DEVCB_NULL, //m_in_pb_cb;
+	DEVCB_NULL, //m_out_pb_cb;
+	DEVCB_NULL, //m_out_brdy_cb;
+};
+
+static MACHINE_CONFIG_FRAGMENT( cpc_pds )
+	MCFG_Z80PIO_ADD("pio",XTAL_4MHz,pio_intf) // no clock on the PCB, so will presume that it uses the CPC's clock
+
+	// no pass-through seen on remake PCBs, unknown if actual hardware had a pass-through port or not
+MACHINE_CONFIG_END
+
+
+machine_config_constructor cpc_pds_device::device_mconfig_additions() const
+{
+	return MACHINE_CONFIG_NAME( cpc_pds );
+}
+
+
+//**************************************************************************
+//  LIVE DEVICE
+//**************************************************************************
+
+cpc_pds_device::cpc_pds_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+	device_t(mconfig, CPC_PDS, "Programmers Development System (CPC Target)", tag, owner, clock, "cpc_pds", __FILE__),
+	device_cpc_expansion_card_interface(mconfig, *this),
+	m_pio(*this,"pio")
+{
+}
+
+//-------------------------------------------------
+//  device_start - device-specific startup
+//-------------------------------------------------
+
+void cpc_pds_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(0xfbec,0xfbef,0,0,read8_delegate(FUNC(cpc_pds_device::pio_r),this),write8_delegate(FUNC(cpc_pds_device::pio_w),this));
+}
+
+//-------------------------------------------------
+//  device_reset - device-specific reset
+//-------------------------------------------------
+
+void cpc_pds_device::device_reset()
+{
+	// TODO
+}
+
+
+READ8_MEMBER(cpc_pds_device::pio_r)
+{
+	return m_pio->read(space,offset);
+}
+
+WRITE8_MEMBER(cpc_pds_device::pio_w)
+{
+	m_pio->write(space,offset,data);
+}

src/mess/machine/cpc_pds.h

@@ -0,0 +1,56 @@
+/*
+ * cpc_pds.h  --  CPC interface hardware for the Programmers Development System
+ *
+ *  Created on: 10/02/2014
+ *
+ *  Contains a Z80 PIO used to communicate with PC-side hardware (8-bit ISA card containing an 8255 PPI),
+ *  connected via a 16-pin cable.  Although it would seem that the C64 has a different cable that directly
+ *  interfaces with the user port.
+ *
+ *  The Z80 PIO is mapped to the CPC at:
+ *  FBEC Z80 PIO Port A Data (8bit data to/from PC)
+ *  FBED Z80 PIO Port B Data (handshake to/from PC)
+ *  FBEE Z80 PIO Port A Control
+ *  FBEF Z80 PIO Port B Control
+ *
+ *  More info: http://cpcwiki.eu/index.php/PDS_development_system
+ *
+ *  TODO: Come up with some way to connect two instances of MESS, one running the PC software, the other
+ *  running the target side
+ */
+
+#ifndef CPC_PDS_H_
+#define CPC_PDS_H_
+
+#include "emu.h"
+#include "machine/cpcexp.h"
+#include "machine/z80pio.h"
+
+class cpc_pds_device  : public device_t,
+						public device_cpc_expansion_card_interface
+{
+public:
+	// construction/destruction
+	cpc_pds_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_READ8_MEMBER(pio_r);
+	DECLARE_WRITE8_MEMBER(pio_w);
+
+protected:
+	// device-level overrides
+	virtual void device_start();
+	virtual void device_reset();
+
+private:
+	cpc_expansion_slot_device *m_slot;
+
+	required_device<z80pio_device> m_pio;
+};
+
+// device type definition
+extern const device_type CPC_PDS;
+
+#endif /* CPC_PDS_H_ */

src/mess/mess.mak

@@ -914,6 +914,7 @@ $(MESSOBJ)/amstrad.a:           \
 	$(MESS_MACHINE)/cpcexp.o    \
 	$(MESS_MACHINE)/cpc_ssa1.o  \
 	$(MESS_MACHINE)/cpc_rom.o   \
+	$(MESS_MACHINE)/cpc_pds.o   \
 	$(MESS_MACHINE)/mface2.o    \
 	$(MESS_DRIVERS)/amstr_pc.o  \
 	$(MESS_MACHINE)/amstr_pc.o  \