bus/spectrum: Added ZXBUS Nemo IDE Controller. (#11523)

scripts/src/bus.lua

@@ -4612,6 +4612,8 @@ if (BUSES["ZXBUS"]~=null) then
 	files {
 		MAME_DIR .. "src/devices/bus/spectrum/zxbus.cpp",
 		MAME_DIR .. "src/devices/bus/spectrum/zxbus.h",
+		MAME_DIR .. "src/devices/bus/spectrum/nemoide.cpp",
+		MAME_DIR .. "src/devices/bus/spectrum/nemoide.h",
 		MAME_DIR .. "src/devices/bus/spectrum/neogs.cpp",
 		MAME_DIR .. "src/devices/bus/spectrum/neogs.h",
 		MAME_DIR .. "src/devices/bus/spectrum/smuc.cpp",

src/devices/bus/spectrum/nemoide.cpp

@@ -0,0 +1,85 @@
+// license:BSD-3-Clause
+// copyright-holders:Andrei I. Holub
+
+#include "emu.h"
+#include "nemoide.h"
+
+#include "bus/ata/ataintf.h"
+#include "bus/ata/atapicdr.h"
+#include "bus/ata/hdd.h"
+
+namespace bus::spectrum::zxbus {
+
+namespace {
+
+class nemoide_device : public device_t, public device_zxbus_card_interface
+{
+public:
+	nemoide_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+		: device_t(mconfig, ZXBUS_NEMOIDE, tag, owner, clock)
+		, device_zxbus_card_interface(mconfig, *this)
+		, m_ata(*this, "ata")
+	{ }
+
+protected:
+	virtual void device_add_mconfig(machine_config &config) override;
+	virtual void device_start() override;
+
+private:
+	void map_io(address_map &map);
+
+	u8 ata_r(offs_t offset);
+	void ata_w(offs_t offset, u8 data);
+
+	required_device<ata_interface_device> m_ata;
+
+	u8 m_ata_data_latch;
+};
+
+u8 nemoide_device::ata_r(offs_t offset)
+{
+    const u16 data = m_ata->cs0_r((offset >> 5) & 7);
+	if (!machine().side_effects_disabled())
+		m_ata_data_latch = data >> 8;
+
+	return data & 0xff;
+}
+
+void nemoide_device::ata_w(offs_t offset, u8 data)
+{
+	const u16 ata_data = (m_ata_data_latch << 8) | data;
+    m_ata->cs0_w((offset >> 5) & 7, ata_data);
+}
+
+void nemoide_device::map_io(address_map &map)
+{
+	map(0x00011, 0x00011).mirror(0xff00).lrw8(NAME([this]() { return m_ata_data_latch; })
+		, NAME([this](offs_t offset, u8 data) { m_ata_data_latch = data; }));
+	map(0x00010, 0x00010).select(0xffe0).rw(FUNC(nemoide_device::ata_r), FUNC(nemoide_device::ata_w));
+	map(0x000c8, 0x000c8).mirror(0xff00).lrw8(NAME([this]() { return m_ata->cs1_r(6); })
+		, NAME([this](offs_t offset, u8 data) { m_ata->cs1_w(6, data); }));
+}
+
+static void nemoide_ata_devices(device_slot_interface &device)
+{
+	device.option_add("hdd", IDE_HARDDISK);
+	device.option_add("cdrom", ATAPI_CDROM);
+}
+
+void nemoide_device::device_add_mconfig(machine_config &config)
+{
+	ATA_INTERFACE(config, m_ata).options(nemoide_ata_devices, "hdd", "hdd", false);
+}
+
+void nemoide_device::device_start()
+{
+	save_item(NAME(m_ata_data_latch));
+
+	m_zxbus->install_device(0x00000, 0x1ffff, *this, &nemoide_device::map_io);
+}
+
+} // anonymous namespace
+
+} // namespace bus::spectrum::zxbus
+
+DEFINE_DEVICE_TYPE_PRIVATE(ZXBUS_NEMOIDE, device_zxbus_card_interface, bus::spectrum::zxbus::nemoide_device, "nemoide", "Nemo IDE Controller")

src/devices/bus/spectrum/nemoide.h

@@ -0,0 +1,14 @@
+// license:BSD-3-Clause
+// copyright-holders:Andrei I. Holub
+
+#ifndef MAME_SINCLAIR_NEMOIDE_H
+#define MAME_SINCLAIR_NEMOIDE_H
+
+#pragma once
+
+#include "zxbus.h"
+
+
+DECLARE_DEVICE_TYPE(ZXBUS_NEMOIDE, device_zxbus_card_interface)
+
+#endif // MAME_SINCLAIR_NEMOIDE_H

src/devices/bus/spectrum/neogs.cpp

@@ -426,9 +426,9 @@ const tiny_rom_entry *neogs_device::device_rom_region() const
 
 void neogs_device::neogsmap(address_map &map)
 {
-	map(0x00bb, 0x00bb).mirror(0xff00).rw(FUNC(neogs_device::neogs_status_r), FUNC(neogs_device::neogs_command_w));
+	map(0x000bb, 0x000bb).mirror(0xff00).rw(FUNC(neogs_device::neogs_status_r), FUNC(neogs_device::neogs_command_w));
-	map(0x00b3, 0x00b3).mirror(0xff00).rw(FUNC(neogs_device::neogs_data_r), FUNC(neogs_device::neogs_data_w));
+	map(0x000b3, 0x000b3).mirror(0xff00).rw(FUNC(neogs_device::neogs_data_r), FUNC(neogs_device::neogs_data_w));
-	map(0x0033, 0x0033).mirror(0xff00).w(FUNC(neogs_device::neogs_ctrl_w));
+	map(0x00033, 0x00033).mirror(0xff00).w(FUNC(neogs_device::neogs_ctrl_w));
 }
 
 void neogs_device::device_start()

src/devices/bus/spectrum/zxbus.cpp

@@ -66,11 +66,13 @@ void device_zxbus_card_interface::interface_pre_start()
 }
 
 
+#include "nemoide.h"
 #include "neogs.h"
 #include "smuc.h"
 
 void zxbus_cards(device_slot_interface &device)
 {
+	device.option_add("nemoide", ZXBUS_NEMOIDE);
 	device.option_add("neogs", ZXBUS_NEOGS);
 	device.option_add("smuc", ZXBUS_SMUC);
 }