bus/cbus: add MIF-201 MIDI interface stub

scripts/src/bus.lua

@@ -5288,6 +5288,8 @@ if (BUSES["CBUS"]~=null) then
 	files {
 		MAME_DIR .. "src/devices/bus/cbus/amd98.cpp",
 		MAME_DIR .. "src/devices/bus/cbus/amd98.h",
+		MAME_DIR .. "src/devices/bus/cbus/mif201.cpp",
+		MAME_DIR .. "src/devices/bus/cbus/mif201.h",
 		MAME_DIR .. "src/devices/bus/cbus/mpu_pc98.cpp",
 		MAME_DIR .. "src/devices/bus/cbus/mpu_pc98.h",
 		MAME_DIR .. "src/devices/bus/cbus/pc9801_26.cpp",

src/devices/bus/cbus/mif201.cpp

@@ -0,0 +1,70 @@
+// license:BSD-3-Clause
+// copyright-holders: Angelo Salese
+/**************************************************************************************************
+
+MIF-201 MIDI interface
+
+Bundled with Micro Musician VA
+
+References:
+- https://mamedev.emulab.it/kale/fast/files/micromusician_va.jpg
+
+TODO:
+- evasive, needs manual, dip-switch sheet and PCB pictures;
+
+**************************************************************************************************/
+
+#include "emu.h"
+#include "mif201.h"
+
+DEFINE_DEVICE_TYPE(MIF201, mif201_device, "mif201", "Micro Musician VA MIF-201 MIDI Interface")
+
+mif201_device::mif201_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+	: device_t(mconfig, MIF201, tag, owner, clock)
+	, m_bus(*this, DEVICE_SELF_OWNER)
+	, m_uart(*this, "uart%u", 1U)
+	, m_pit(*this, "pit")
+{
+}
+
+//void mif201_device::irq_out(int state)
+//{
+//	m_bus->int_w<2>(state);
+//}
+
+
+void mif201_device::device_add_mconfig(machine_config &config)
+{
+	// TODO: unknown clocks
+	I8251(config, m_uart[0], 1021800);
+
+	I8251(config, m_uart[1], 1021800);
+
+	PIT8253(config, m_pit, 1021800);
+}
+
+void mif201_device::device_start()
+{
+	// sheet claims i8251-1 having swapped ports compared to i8251-2 but micromus just uses
+	// $e2d2 for control, assume typo.
+	m_bus->install_io(0xe2d0, 0xe2d3,
+		read8sm_delegate(*this, [this](offs_t offset) { return m_uart[0]->read(offset); }, "uart1_r"),
+		write8sm_delegate(*this, [this](offs_t offset, u8 data) { m_uart[0]->write(offset, data); }, "uart1_w")
+	);
+	m_bus->install_io(0xe4d0, 0xe4d3,
+		read8sm_delegate(*this, [this](offs_t offset) { return m_uart[1]->read(offset); }, "uart2_r"),
+		write8sm_delegate(*this, [this](offs_t offset, u8 data) { m_uart[1]->write(offset, data); }, "uart2_w")
+	);
+	m_bus->install_io(0xe6d0, 0xe6d3,
+		read8sm_delegate(*this, [this](offs_t offset) { return m_pit->read(offset); }, "pit_low_r"),
+		write8sm_delegate(*this, [this](offs_t offset, u8 data) { m_pit->write(offset, data); }, "pit_low_w")
+	);
+	m_bus->install_io(0xe7d0, 0xe7d3,
+		read8sm_delegate(*this, [this](offs_t offset) { return m_pit->read(offset | 2); }, "pit_high_r"),
+		write8sm_delegate(*this, [this](offs_t offset, u8 data) { m_pit->write(offset | 2, data); }, "pit_high_w")
+	);
+}
+
+void mif201_device::device_reset()
+{
+}

src/devices/bus/cbus/mif201.h

@@ -0,0 +1,46 @@
+// license:BSD-3-Clause
+// copyright-holders: Angelo Salese
+#ifndef MAME_BUS_CBUS_MIF201_H
+#define MAME_BUS_CBUS_MIF201_H
+
+#pragma once
+
+#include "bus/cbus/pc9801_cbus.h"
+#include "machine/i8251.h"
+#include "machine/pit8253.h"
+
+//**************************************************************************
+//  TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> mpu_pc98_device
+
+class mif201_device : public device_t
+{
+public:
+	// construction/destruction
+	mif201_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+	static constexpr feature_type unemulated_features() { return feature::SOUND; }
+
+protected:
+	// device-level overrides
+	virtual void device_start() override ATTR_COLD;
+	virtual void device_reset() override ATTR_COLD;
+
+	// optional information overrides
+	virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
+
+private:
+	required_device<pc9801_slot_device> m_bus;
+	required_device_array<i8251_device, 2> m_uart;
+	required_device<pit8253_device>  m_pit;
+
+//	void map(address_map &map);
+};
+
+
+// device type definition
+DECLARE_DEVICE_TYPE(MIF201, mif201_device)
+
+#endif // MAME_BUS_CBUS_MIF201_H

src/devices/bus/cbus/pc9801_cbus.cpp

@@ -5,17 +5,21 @@
 C-bus slot interface for PC-98xx family
 
 a.k.a. NEC version of the ISA bus.
-    C-bus -> Card Bus
+C-bus -> Compatible Bus
+
+References:
+- https://98epjunk.shakunage.net/sw/ext_card/ext_card.html
+- https://ja.wikipedia.org/wiki/C%E3%83%90%E3%82%B9
+- https://www.pc-9800.net/db2/db2_ga_index.htm
+- http://ookumaneko.s1005.xrea.com/pcibios.htm (PCI era mapping)
 
 TODO:
-    - stub interface, checkout what actually belongs here.
+- stub interface, checkout what actually belongs here
-      Speculation is that C-bus has ROM / RAM slots always in the 0xc0000-0xdffff region,
-      and some opacity can be added if true.
 - move pc9801_cbus_devices declaration from pc9801 driver in here;
 - 8-bit I/O smearing should be handled here;
 - INT# should be handled here too;
 - Best way to inform user when it tries to install incompatible boards?
-    - Support for PCI bridging on later machines (cfr. pc9801cx3);
+- Support for PCI bridging on later machines (cfr. pc9821cx3);
 
 **************************************************************************************************/
 

src/mame/nec/pc88va.cpp

@@ -753,11 +753,11 @@ void pc88va_state::io_map(address_map &map)
 	);
 	map(0x0540, 0x0547).umask16(0x00ff).lrw8(
 		NAME([this] (offs_t offset) {
-			LOGGFXCTRL("PATRH%d R\n", offset);
+			LOGGFXCTRL("Multiplane PATRH%d R\n", offset);
 			return m_multiplane.patr[offset][1];
 		}),
 		NAME([this] (offs_t offset, u8 data) {
-			LOGGFXCTRL("PATRH%d W %02x\n", offset, data);
+			LOGGFXCTRL("Multiplane PATRH%d W %02x\n", offset, data);
 			m_multiplane.patr[offset][1] = data;
 		})
 	);
@@ -802,11 +802,11 @@ void pc88va_state::io_map(address_map &map)
 	);
 	map(0x0590, 0x0593).umask16(0x00ff).lrw8(
 		NAME([this] (offs_t offset) {
-			LOGGFXCTRL("Singleplane PATRL%d R\n", offset);
+			LOGGFXCTRL("Singleplane PATR%d R\n", offset);
 			return m_singleplane.patr[offset];
 		}),
 		NAME([this] (offs_t offset, u8 data) {
-			LOGGFXCTRL("Singleplane PATRL%d W %02x\n", offset, data);
+			LOGGFXCTRL("Singleplane PATR%d W %02x\n", offset, data);
 			m_singleplane.patr[offset] = data;
 		})
 	);
@@ -1265,6 +1265,7 @@ static void pc88va_cbus_devices(device_slot_interface &device)
 {
 	device.option_add("pc9801_55u", PC9801_55U);
 	device.option_add("pc9801_55l", PC9801_55L);
+	device.option_add("mif_201",    MIF201);
 	device.option_add("mpu_pc98",   MPU_PC98);
 }
 

src/mame/nec/pc88va.h

@@ -29,11 +29,12 @@
 #include "sound/ymopn.h"
 
 //#include "bus/cbus/amd98.h"
+#include "bus/cbus/mif201.h"
+#include "bus/cbus/mpu_pc98.h"
 //#include "bus/cbus/pc9801_26.h"
 #include "bus/cbus/pc9801_55.h"
 //#include "bus/cbus/pc9801_86.h"
 //#include "bus/cbus/pc9801_118.h"
-#include "bus/cbus/mpu_pc98.h"
 //#include "bus/cbus/sb16_ct2720.h"