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-rw-r--r--src/devices/bus/st/replay.cpp108
1 files changed, 108 insertions, 0 deletions
diff --git a/src/devices/bus/st/replay.cpp b/src/devices/bus/st/replay.cpp
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+// license:BSD-3-Clause
+// copyright-holders: Olivier Galibert
+
+// Microdeal ST Replay
+
+// A 8-bit mono DAC and a 8-bit mono ADC on a cartridge, with a vague
+// lowpass filter.
+
+// A peculiarity of the ST cartridge port is that it's readonly. So
+// writing to the DAC is done by reading at an appropriate address.
+
+#include "emu.h"
+#include "replay.h"
+
+#include "sound/adc.h"
+#include "sound/dac.h"
+#include "speaker.h"
+
+namespace {
+
+class st_replay_device : public device_t, public device_stcart_interface
+{
+public:
+ st_replay_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
+ virtual ~st_replay_device();
+
+ virtual void map(address_space_installer &space) override;
+
+protected:
+ virtual void device_start() override ATTR_COLD;
+ virtual void device_reset() override ATTR_COLD;
+ virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
+
+private:
+ required_device<zn449_device> m_adc;
+ required_device<zn429e_device> m_dac;
+ required_device<microphone_device> m_mic;
+ required_device<speaker_device> m_speaker;
+
+ void cartmap(address_map &map) ATTR_COLD;
+
+ u16 dac_w(offs_t data);
+ u8 adc_r();
+};
+
+st_replay_device::st_replay_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+ device_t(mconfig, ST_REPLAY, tag, owner, clock),
+ device_stcart_interface(mconfig, *this),
+ m_adc(*this, "adc"),
+ m_dac(*this, "dac"),
+ m_mic(*this, "mic"),
+ m_speaker(*this, "speaker")
+{
+}
+
+st_replay_device::~st_replay_device()
+{
+}
+
+u16 st_replay_device::dac_w(offs_t data)
+{
+ m_dac->write(data);
+ return 0xffff;
+}
+
+u8 st_replay_device::adc_r()
+{
+ double tm = machine().time().as_double();
+ s8 level = 127 * sin(tm*440*2*M_PI);
+ return level + 0x80;
+}
+
+void st_replay_device::map(address_space_installer &space)
+{
+ space.install_device(0xfa0000, 0xfbffff, *this, &st_replay_device::cartmap);
+}
+
+void st_replay_device::cartmap(address_map &map)
+{
+ map(0x00000, 0x001ff).r(FUNC(st_replay_device::dac_w)).mirror(0xfe00);
+ map(0x10001, 0x10001).r(m_adc, FUNC(zn449_device::read)).mirror(0xfffe);
+}
+
+void st_replay_device::device_add_mconfig(machine_config &config)
+{
+ MICROPHONE(config, m_mic, 1).front_center();
+ m_mic->add_route(0, m_adc, 1.0, 0);
+
+ ZN449(config, m_adc);
+
+ // ZN429D the schematics say, not sure if any significant difference
+ ZN429E(config, m_dac);
+ m_dac->add_route(0, m_speaker, 1.0, 0);
+
+ SPEAKER(config, m_speaker, 1).front_center();
+}
+
+void st_replay_device::device_start()
+{
+}
+
+void st_replay_device::device_reset()
+{
+}
+
+} // anonymous namespace
+
+DEFINE_DEVICE_TYPE_PRIVATE(ST_REPLAY, device_stcart_interface, st_replay_device, "st_replay", "Microdeal ST Replay")