apple2: Added support for the ProDOS ROM Drive card. [R. Belmont]

scripts/src/bus.lua

@@ -2587,6 +2587,8 @@ if (BUSES["A2BUS"]~=null) then
 		MAME_DIR .. "src/devices/bus/a2bus/nippelclock.h",
 		MAME_DIR .. "src/devices/bus/a2bus/pc_xporter.cpp",
 		MAME_DIR .. "src/devices/bus/a2bus/pc_xporter.h",
+		MAME_DIR .. "src/devices/bus/a2bus/prodosromdrive.cpp",
+		MAME_DIR .. "src/devices/bus/a2bus/prodosromdrive.h",
 		MAME_DIR .. "src/devices/bus/a2bus/q68.cpp",
 		MAME_DIR .. "src/devices/bus/a2bus/q68.h",
 		MAME_DIR .. "src/devices/bus/a2bus/ramcard128k.cpp",

src/devices/bus/a2bus/cards.cpp

@@ -47,6 +47,7 @@
 #include "bus/a2bus/grappler.h"
 #include "bus/a2bus/laser128.h"
 #include "bus/a2bus/mouse.h"
+#include "bus/a2bus/prodosromdrive.h"
 #include "bus/a2bus/ramcard128k.h"
 #include "bus/a2bus/ramcard16k.h"
 #include "bus/a2bus/ssbapple.h"
@@ -215,6 +216,7 @@ void apple2e_cards(device_slot_interface &device)
 	device.option_add("q68plus", A2BUS_Q68PLUS);               // Stellation Q68 Plus 68000 card
 	device.option_add("a2sd", A2BUS_A2SD);                     // Florian Reitz AppleIISD
 	device.option_add("grafex", A2BUS_GRAFEX);                 // Grafex card (uPD7220 graphics)
+	device.option_add("pdromdrive", A2BUS_PRODOSROMDRIVE);	   // ProDOS ROM Drive
 }
 
 void apple2gs_cards(device_slot_interface &device)
@@ -285,6 +287,7 @@ void apple2gs_cards(device_slot_interface &device)
 	device.option_add("q68", A2BUS_Q68);                       // Stellation Q68 68000 card
 	device.option_add("q68plus", A2BUS_Q68PLUS);               // Stellation Q68 Plus 68000 card
 	device.option_add("grafex", A2BUS_GRAFEX);                 // Grafex card (uPD7220 graphics)
+	device.option_add("pdromdrive", A2BUS_PRODOSROMDRIVE);	   // ProDOS ROM Drive
 }
 
 void apple3_cards(device_slot_interface &device)

src/devices/bus/a2bus/prodosromdrive.cpp

@@ -0,0 +1,119 @@
+// license:BSD-3-Clause
+// copyright-holders:R. Belmont
+/*********************************************************************
+
+	prodosromdrive.cpp
+
+	Implementation of the ProDOS ROM Drive card
+
+	This is a hobbyist board which provides a minimal SmartPort API
+	interface to boot from a 1 MiB disk image stored in a 27C080 or
+	compatible EPROM.
+
+	Board and firmware by Terence J. Boldt
+	http://apple2.ca/
+	https://github.com/tjboldt/ProDOS-ROM-Drive
+
+	The firmware requires a IIe or better, and some of the games
+	included require a 65C02 (enhanced IIe).
+
+*********************************************************************/
+
+#include "emu.h"
+#include "prodosromdrive.h"
+
+namespace {
+
+//**************************************************************************
+//  TYPE DEFINITIONS
+//**************************************************************************
+
+class a2bus_pdromdrive_device : public device_t,
+							public device_a2bus_card_interface
+{
+public:
+	// construction/destruction
+	a2bus_pdromdrive_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+	a2bus_pdromdrive_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
+
+	virtual void device_start() override;
+	virtual const tiny_rom_entry *device_rom_region() const override;
+
+	// overrides of standard a2bus slot functions
+	virtual uint8_t read_c0nx(uint8_t offset) override;
+	virtual void write_c0nx(uint8_t offset, uint8_t data) override;
+	virtual uint8_t read_cnxx(uint8_t offset) override;
+
+private:
+	required_region_ptr<u8> m_rom;
+
+	u16 m_latch;
+};
+
+//**************************************************************************
+//  LIVE DEVICE
+//**************************************************************************
+
+a2bus_pdromdrive_device::a2bus_pdromdrive_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+	a2bus_pdromdrive_device(mconfig, A2BUS_PRODOSROMDRIVE, tag, owner, clock)
+{
+}
+
+a2bus_pdromdrive_device::a2bus_pdromdrive_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) :
+	device_t(mconfig, type, tag, owner, clock),
+	device_a2bus_card_interface(mconfig, *this),
+	m_rom(*this, "romdrive")
+{
+}
+
+void a2bus_pdromdrive_device::device_start()
+{
+	save_item(NAME(m_latch));
+}
+
+ROM_START( pdromdrive )
+	ROM_REGION(0x100000, "romdrive", 0)
+	ROM_LOAD( "gameswithfirmware.bin", 0x000000, 0x100000, CRC(a1efd23b) SHA1(f0733b7a68126adc5247a1008de2ea4f65ad645a) )
+ROM_END
+
+const tiny_rom_entry *a2bus_pdromdrive_device::device_rom_region() const
+{
+	return ROM_NAME(pdromdrive);
+}
+
+uint8_t a2bus_pdromdrive_device::read_c0nx(uint8_t offset)
+{
+	return m_rom[(m_latch << 4) | (offset & 0xf)];
+}
+
+void a2bus_pdromdrive_device::write_c0nx(uint8_t offset, uint8_t data)
+{
+	switch (offset)
+	{
+		case 0:
+			m_latch &= 0xff00;
+			m_latch |= data;
+			break;
+
+		case 1:
+			m_latch &= 0x00ff;
+			m_latch |= (data << 8);
+			break;
+	}
+}
+
+uint8_t a2bus_pdromdrive_device::read_cnxx(uint8_t offset)
+{
+	return m_rom[offset + 0x300];
+}
+
+} // anonymous namespace
+
+
+//**************************************************************************
+//  GLOBAL VARIABLES
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE_PRIVATE(A2BUS_PRODOSROMDRIVE, device_a2bus_card_interface, a2bus_pdromdrive_device, "a2pdromdr", "ProDOS ROM Drive")

src/devices/bus/a2bus/prodosromdrive.h

@@ -0,0 +1,21 @@
+// license:BSD-3-Clause
+// copyright-holders:R. Belmont
+/*********************************************************************
+
+    prodosromdrive.h
+
+    Implementation of the ProDOS ROM Drive card
+
+*********************************************************************/
+
+#ifndef MAME_BUS_A2BUS_PRODOSROMDRIVE_H
+#define MAME_BUS_A2BUS_PRODOSROMDRIVE_H
+
+#pragma once
+
+#include "a2bus.h"
+
+// device type definition
+DECLARE_DEVICE_TYPE(A2BUS_PRODOSROMDRIVE, device_a2bus_card_interface)
+
+#endif  // MAME_BUS_A2BUS_PRODOSROMDRIVE_H