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-rw-r--r--src/devices/bus/cpc/musicmachine.cpp128
1 files changed, 128 insertions, 0 deletions
diff --git a/src/devices/bus/cpc/musicmachine.cpp b/src/devices/bus/cpc/musicmachine.cpp
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+++ b/src/devices/bus/cpc/musicmachine.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Barry Rodewald
+/*
+ * The Music Machine - MIDI and sampling expansion
+ * by Ram Electronics
+ */
+
+#include "emu.h"
+#include "musicmachine.h"
+
+#include "sound/volt_reg.h"
+#include "bus/midi/midi.h"
+#include "machine/clock.h"
+#include "speaker.h"
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(CPC_MUSICMACHINE, cpc_musicmachine_device, "cpcmusic", "The Music Machine")
+
+
+void cpc_musicmachine_device::device_add_mconfig(machine_config &config)
+{
+ ACIA6850(config, m_acia).txd_handler().set("mdout", FUNC(midi_port_device::write_txd));
+ m_acia->irq_handler().set(DEVICE_SELF_OWNER, FUNC(cpc_expansion_slot_device::nmi_w));
+ MIDI_PORT(config, "mdin", midiin_slot, "midiin").rxd_handler().set(m_acia, FUNC(acia6850_device::write_rxd));
+ MIDI_PORT(config, "mdout", midiout_slot, "midiout");
+ clock_device &acia_clock(CLOCK(config, "acia_clock", 31250*16));
+ acia_clock.signal_handler().set(FUNC(cpc_musicmachine_device::write_acia_clock));
+
+ SPEAKER(config, "speaker").front_center();
+ ZN429E(config, m_dac, 0).add_route(ALL_OUTPUTS, "speaker", 0.2);
+ voltage_regulator_device &vref(VOLTAGE_REGULATOR(config, "vref"));
+ vref.add_route(0, "dac", 1.0, DAC_VREF_POS_INPUT);
+ vref.add_route(0, "dac", -1.0, DAC_VREF_NEG_INPUT);
+
+ // no pass-through
+}
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+cpc_musicmachine_device::cpc_musicmachine_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+ device_t(mconfig, CPC_MUSICMACHINE, tag, owner, clock),
+ device_cpc_expansion_card_interface(mconfig, *this),
+ m_slot(nullptr),
+ m_acia(*this,"acia"),
+ m_dac(*this,"dac"),
+ m_irq_select(false)
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void cpc_musicmachine_device::device_start()
+{
+ m_slot = dynamic_cast<cpc_expansion_slot_device *>(owner());
+ address_space &space = m_slot->cpu().space(AS_IO);
+
+ space.install_write_handler(0xf8e8,0xf8e8,write8_delegate(FUNC(cpc_musicmachine_device::irqsel_w),this));
+ space.install_readwrite_handler(0xf8ec,0xf8ef,read8_delegate(FUNC(cpc_musicmachine_device::acia_r), this),write8_delegate(FUNC(cpc_musicmachine_device::acia_w),this));
+ space.install_write_handler(0xf8f0,0xf8f0,write8_delegate(FUNC(cpc_musicmachine_device::dac_w),this));
+ // 0xf8f4 - ADC read8_delegate
+ // 0xf8f8 - ADC start
+}
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void cpc_musicmachine_device::device_reset()
+{
+ // TODO
+}
+
+WRITE8_MEMBER(cpc_musicmachine_device::dac_w)
+{
+ m_dac->write(data);
+}
+
+READ8_MEMBER(cpc_musicmachine_device::acia_r)
+{
+ uint8_t ret = 0;
+
+ switch(offset)
+ {
+ case 2:
+ ret = m_acia->status_r();
+ break;
+ case 3:
+ ret = m_acia->data_r();
+ break;
+ }
+
+ return ret;
+}
+
+WRITE8_MEMBER(cpc_musicmachine_device::acia_w)
+{
+ switch(offset)
+ {
+ case 0:
+ m_acia->control_w(data);
+ break;
+ case 1:
+ m_acia->data_w(data);
+ break;
+ }
+}
+
+WRITE8_MEMBER(cpc_musicmachine_device::irqsel_w)
+{
+ if(data == 0x01)
+ m_irq_select = true;
+ else
+ m_irq_select = false;
+}
+
+WRITE_LINE_MEMBER(cpc_musicmachine_device::irq_w)
+{
+ if(m_irq_select)
+ m_slot->nmi_w(state);
+}
+