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-rw-r--r--src/devices/bus/epson_qx/sound_card.cpp125
1 files changed, 125 insertions, 0 deletions
diff --git a/src/devices/bus/epson_qx/sound_card.cpp b/src/devices/bus/epson_qx/sound_card.cpp
new file mode 100644
index 00000000000..95e833fac03
--- /dev/null
+++ b/src/devices/bus/epson_qx/sound_card.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Brian Johnson
+/*******************************************************************
+ *
+ * YM2149 based sound card with header for an external MPU401
+ *
+ * Board Design: https://github.com/brijohn/qx10/tree/master/kicad/ym2149_sound_card
+ *
+ *******************************************************************/
+
+#include "emu.h"
+#include "sound_card.h"
+
+#include "speaker.h"
+
+//**************************************************************************
+// YM2149 SOUND CARD DEVICE
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(EPSON_QX_OPTION_YM2149, bus::epson_qx::ym2149_sound_card_device, "epson_qx_option_sound_card", "Epson QX-10 YM2149 Sound Card")
+
+namespace bus::epson_qx {
+
+static INPUT_PORTS_START( ym2149_sound_card )
+ PORT_START("IOBASE")
+ PORT_CONFNAME(0xf0, 0xc0, "IO Base Address Selection")
+ PORT_CONFSETTING(0x80, "&80")
+ PORT_CONFSETTING(0x90, "&90")
+ PORT_CONFSETTING(0xa0, "&A0")
+ PORT_CONFSETTING(0xb0, "&B0")
+ PORT_CONFSETTING(0xc0, "&C0")
+ PORT_CONFSETTING(0xd0, "&D0")
+ PORT_CONFSETTING(0xe0, "&E0")
+ PORT_CONFSETTING(0xf0, "&F0")
+ PORT_START("IRQ")
+ PORT_CONFNAME(0x03, 0x03, "MPU IRQ")
+ PORT_CONFSETTING(0x00, "NONE")
+ PORT_CONFSETTING(0x01, "INTH1")
+ PORT_CONFSETTING(0x02, "INTH2")
+ PORT_CONFSETTING(0x03, "INTL")
+INPUT_PORTS_END
+
+//-------------------------------------------------
+// ym2149_sound_card_device - constructor
+//-------------------------------------------------
+ym2149_sound_card_device::ym2149_sound_card_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+ device_t(mconfig, EPSON_QX_OPTION_YM2149, tag, owner, clock),
+ device_option_expansion_interface(mconfig, *this),
+ m_mpu401(*this, "mpu401"),
+ m_ssg(*this, "ym2149"),
+ m_iobase(*this, "IOBASE"),
+ m_irq(*this, "IRQ"),
+ m_installed(false)
+{
+}
+
+//-------------------------------------------------
+// device_input_ports - device-specific ports
+//-------------------------------------------------
+ioport_constructor ym2149_sound_card_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME( ym2149_sound_card );
+}
+
+//-------------------------------------------------
+// device_add_mconfig - device-specific config
+//-------------------------------------------------
+void ym2149_sound_card_device::device_add_mconfig(machine_config &config)
+{
+ MPU401(config, m_mpu401).irq_cb().set(FUNC(ym2149_sound_card_device::mpu_irq_out)).invert();
+ SPEAKER(config, "speaker").front_center();
+ YM2149(config, m_ssg, clock()).add_route(ALL_OUTPUTS, "speaker", 1.0);
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+void ym2149_sound_card_device::device_start()
+{
+ m_installed = false;
+
+ save_item(NAME(m_installed));
+ save_item(NAME(m_irqline));
+}
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+void ym2149_sound_card_device::device_reset()
+{
+ m_ssg->set_pin26_low_w();
+
+ m_irqline = m_irq->read() & 0x03;
+
+ if (!m_installed) {
+ address_space &space = m_bus->iospace();
+ offs_t iobase = m_iobase->read() & 0xf0;
+ space.install_device(iobase, iobase+0x03, *this, &ym2149_sound_card_device::map);
+ m_installed = true;
+ }
+}
+
+void ym2149_sound_card_device::map(address_map &map)
+{
+ map(0x01, 0x01).r(m_ssg, FUNC(ym2149_device::data_r));
+ map(0x00, 0x01).w(m_ssg, FUNC(ym2149_device::address_data_w));
+ map(0x02, 0x03).rw(m_mpu401, FUNC(mpu401_device::mpu_r), FUNC(mpu401_device::mpu_w));
+}
+
+void ym2149_sound_card_device::mpu_irq_out(int state)
+{
+ switch(m_irqline) {
+ case 1:
+ get_slot()->inth1_w(state);
+ break;
+ case 2:
+ get_slot()->inth2_w(state);
+ break;
+ case 3:
+ get_slot()->intl_w(state);
+ break;
+ }
+}
+
+} // namespace bus::epson_qx