bus/centronics: Added a skeleton Epson RX-80 printer device to allow the CPU ROM to be debugged. (#13391)

scripts/src/bus.lua

@@ -3304,6 +3304,8 @@ if (BUSES["CENTRONICS"]~=null) then
 		MAME_DIR .. "src/devices/bus/centronics/epson_lx800.h",
 		MAME_DIR .. "src/devices/bus/centronics/epson_lx810l.cpp",
 		MAME_DIR .. "src/devices/bus/centronics/epson_lx810l.h",
+		MAME_DIR .. "src/devices/bus/centronics/epson_rx80.cpp",
+		MAME_DIR .. "src/devices/bus/centronics/epson_rx80.h",
 		MAME_DIR .. "src/devices/bus/centronics/nec_p72.cpp",
 		MAME_DIR .. "src/devices/bus/centronics/nec_p72.h",
 		MAME_DIR .. "src/devices/bus/centronics/nlq401.cpp",

src/devices/bus/centronics/ctronics.cpp

@@ -122,6 +122,7 @@ device_centronics_peripheral_interface::~device_centronics_peripheral_interface(
 #include "epson_ex800.h"
 #include "epson_lx800.h"
 #include "epson_lx810l.h"
+#include "epson_rx80.h"
 #include "nec_p72.h"
 #include "printer.h"
 #include "digiblst.h"
@@ -139,6 +140,7 @@ void centronics_devices(device_slot_interface &device)
 	device.option_add("lx800", EPSON_LX800);
 	device.option_add("lx810l", EPSON_LX810L);
 	device.option_add("ap2000", EPSON_AP2000);
+	device.option_add("rx80", EPSON_RX80);
 	device.option_add("p72", NEC_P72);
 	device.option_add("printer", CENTRONICS_PRINTER);
 	device.option_add("digiblst", CENTRONICS_DIGIBLASTER);

src/devices/bus/centronics/epson_rx80.cpp

@@ -0,0 +1,171 @@
+// license:BSD-3-Clause
+// copyright-holders:Golden Child
+/***************************************************************************
+
+    Epson RX-80 Dot Matrix printer (skeleton)
+
+ Main CPU is a UPD7810 running at 11 MHz.
+     8K of mask ROM (marked EPSON M64200CA)
+     uses 256 bytes of ram inside upd7810, no external ram chips
+     has a limited line buffer of 137 bytes maximum from ff00 to ff88,
+     used for character buffer as well as during graphic print operation.
+     137 bytes is approximate maximum line length during condensed print.
+
+*****************************************************************************/
+
+#include "emu.h"
+#include "epson_rx80.h"
+
+#include "cpu/upd7810/upd7810.h"
+
+
+namespace {
+
+//**************************************************************************
+//  TYPE DEFINITIONS
+//**************************************************************************
+
+class epson_rx80_device :  public device_t, public device_centronics_peripheral_interface
+{
+public:
+	// construction/destruction
+	epson_rx80_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+	static constexpr feature_type unemulated_features() { return feature::PRINTER; }
+
+	/* Centronics stuff */
+	virtual void input_init(int state) override;
+	virtual void input_strobe(int state) override;
+	virtual void input_data0(int state) override { if (state) m_centronics_data |= 0x01; else m_centronics_data &= ~0x01; }
+	virtual void input_data1(int state) override { if (state) m_centronics_data |= 0x02; else m_centronics_data &= ~0x02; }
+	virtual void input_data2(int state) override { if (state) m_centronics_data |= 0x04; else m_centronics_data &= ~0x04; }
+	virtual void input_data3(int state) override { if (state) m_centronics_data |= 0x08; else m_centronics_data &= ~0x08; }
+	virtual void input_data4(int state) override { if (state) m_centronics_data |= 0x10; else m_centronics_data &= ~0x10; }
+	virtual void input_data5(int state) override { if (state) m_centronics_data |= 0x20; else m_centronics_data &= ~0x20; }
+	virtual void input_data6(int state) override { if (state) m_centronics_data |= 0x40; else m_centronics_data &= ~0x40; }
+	virtual void input_data7(int state) override { if (state) m_centronics_data |= 0x80; else m_centronics_data &= ~0x80; }
+
+protected:
+	virtual void device_start() override ATTR_COLD;
+	virtual void device_reset() override ATTR_COLD;
+
+	virtual const tiny_rom_entry *device_rom_region() const override ATTR_COLD;
+	virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
+	virtual ioport_constructor device_input_ports() const override ATTR_COLD;
+
+	virtual bool supports_pin35_5v() override { return true; }
+
+private:
+	uint8_t centronics_data_r(offs_t offset) { return m_centronics_data; };
+
+	void epson_rx80_mem(address_map &map) ATTR_COLD;
+
+	required_device<upd7810_device> m_maincpu;
+
+	uint8_t m_centronics_data;
+};
+
+//-------------------------------------------------
+//  ROM( epson_rx80 )
+//-------------------------------------------------
+
+ROM_START( epson_rx80 )
+	ROM_REGION(0x2000, "maincpu", 0)  // 8K rom for upd7810
+	ROM_LOAD("rx80_2764.bin", 0x0000, 0x2000, CRC(5206104a) SHA1(3e304f5331181aedb321d3db23a9387e3cfacf0c))
+ROM_END
+
+
+//-------------------------------------------------
+//  rom_region - device-specific ROM region
+//-------------------------------------------------
+
+const tiny_rom_entry *epson_rx80_device::device_rom_region() const
+{
+	return ROM_NAME( epson_rx80 );
+}
+
+
+//-------------------------------------------------
+//  ADDRESS_MAP( epson_rx80_mem )
+//-------------------------------------------------
+
+void epson_rx80_device::epson_rx80_mem(address_map &map)
+{
+	map(0x0000, 0x1fff).rom().region("maincpu", 0);
+	map(0xd800, 0xd800).r(FUNC(epson_rx80_device::centronics_data_r));
+}
+
+
+//-------------------------------------------------
+//  device_add_mconfig - add device configuration
+//-------------------------------------------------
+
+void epson_rx80_device::device_add_mconfig(machine_config &config)
+{
+	upd7810_device &upd(UPD7810(config, m_maincpu, 11000000)); // 11 Mhz
+	upd.set_addrmap(AS_PROGRAM, &epson_rx80_device::epson_rx80_mem);
+
+}
+
+
+//-------------------------------------------------
+//  INPUT_PORTS( epson_rx80 )
+//-------------------------------------------------
+
+INPUT_PORTS_START( epson_rx80 )
+INPUT_PORTS_END
+
+
+//-------------------------------------------------
+//  input_ports - device-specific input ports
+//-------------------------------------------------
+
+ioport_constructor epson_rx80_device::device_input_ports() const
+{
+	return INPUT_PORTS_NAME( epson_rx80 );
+}
+
+
+//-------------------------------------------------
+//  epson_rx80_device - constructor
+//-------------------------------------------------
+
+epson_rx80_device::epson_rx80_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+	device_t(mconfig, EPSON_RX80, tag, owner, clock),
+	device_centronics_peripheral_interface(mconfig, *this),
+	m_maincpu(*this, "maincpu")
+{
+}
+
+//-------------------------------------------------
+//  device_start - device-specific startup
+//-------------------------------------------------
+
+void epson_rx80_device::device_start()
+{
+}
+
+//-------------------------------------------------
+//  device_reset - device-specific reset
+//-------------------------------------------------
+
+void epson_rx80_device::device_reset()
+{
+}
+
+/***************************************************************************
+    Centronics
+***************************************************************************/
+
+void epson_rx80_device::input_strobe(int state)
+{
+}
+
+void epson_rx80_device::input_init(int state)
+{
+}
+
+} // anonymous namespace
+
+// GLOBAL
+DEFINE_DEVICE_TYPE_PRIVATE(EPSON_RX80, device_centronics_peripheral_interface, epson_rx80_device, "epson_rx80", "Epson RX-80")

src/devices/bus/centronics/epson_rx80.h

@@ -0,0 +1,19 @@
+// license:BSD-3-Clause
+// copyright-holders:Golden Child
+/**********************************************************************
+
+    Epson RX-80 dot matrix printer emulation (skeleton)
+
+**********************************************************************/
+
+#ifndef MAME_BUS_CENTRONICS_EPSON_RX80_H
+#define MAME_BUS_CENTRONICS_EPSON_RX80_H
+
+#pragma once
+
+#include "ctronics.h"
+
+// device type declaration
+DECLARE_DEVICE_TYPE(EPSON_RX80, device_centronics_peripheral_interface)
+
+#endif // MAME_BUS_CENTRONICS_EPSON_RX80_H