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-rw-r--r--src/mame/audio/jx8p_synth.cpp98
1 files changed, 98 insertions, 0 deletions
diff --git a/src/mame/audio/jx8p_synth.cpp b/src/mame/audio/jx8p_synth.cpp
new file mode 100644
index 00000000000..3a2513715f6
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+++ b/src/mame/audio/jx8p_synth.cpp
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+// license:BSD-3-Clause
+// copyright-holders:AJR
+/****************************************************************************
+
+ Skeleton device for Roland JX-8P and Super JX synthesizer boards.
+
+****************************************************************************/
+
+#include "emu.h"
+#include "jx8p_synth.h"
+
+DEFINE_DEVICE_TYPE(JX8P_SYNTH, jx8p_synth_device, "jx8p_synth", "Roland JX-8P Synthesizer Board")
+DEFINE_DEVICE_TYPE(SUPERJX_SYNTH, superjx_synth_device, "superjx_synth", "Roland Super JX Synthesizer Board")
+
+
+jx8p_synth_device::jx8p_synth_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock)
+ : device_t(mconfig, type, tag, owner, clock)
+ , m_synthcpu(*this, "synthcpu")
+ , m_ramio(*this, "ramio")
+ , m_pit(*this, "pit%u", 1U)
+{
+}
+
+jx8p_synth_device::jx8p_synth_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : jx8p_synth_device(mconfig, JX8P_SYNTH, tag, owner, clock)
+{
+}
+
+superjx_synth_device::superjx_synth_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : jx8p_synth_device(mconfig, SUPERJX_SYNTH, tag, owner, clock)
+{
+}
+
+void jx8p_synth_device::device_start()
+{
+}
+
+
+void jx8p_synth_device::prescale_w(u8 data)
+{
+ double clockin = clock() / (16.0 - (data & 0x0f));
+ for (int n = 0; n < 2; n++)
+ {
+ m_pit[n]->set_clockin(0, clockin);
+ m_pit[n]->set_clockin(1, clockin);
+ m_pit[n]->set_clockin(2, clockin);
+ }
+
+ u32 timerin = clock() / (16 - ((data & 0xf0) >> 4));
+ m_ramio->set_unscaled_clock(timerin);
+}
+
+void jx8p_synth_device::adc_w(offs_t offset, u8 data)
+{
+}
+
+void jx8p_synth_device::prog_map(address_map &map)
+{
+ map.global_mask(0x3fff);
+ map(0x0000, 0x3fff).rom().region("program", 0);
+}
+
+void jx8p_synth_device::ext_map(address_map &map)
+{
+ map(0x0000, 0x00ff).mirror(0x3800).rw(m_ramio, FUNC(i8155_device::memory_r), FUNC(i8155_device::memory_w));
+ map(0x0100, 0x0107).mirror(0x38f8).rw(m_ramio, FUNC(i8155_device::io_r), FUNC(i8155_device::io_w));
+ map(0x0200, 0x0203).mirror(0x38fc).w(m_pit[0], FUNC(pit8253_device::write));
+ map(0x0300, 0x0303).mirror(0x38fc).w(m_pit[1], FUNC(pit8253_device::write));
+ map(0x0400, 0x0403).mirror(0x38fc).w(m_pit[2], FUNC(pit8253_device::write));
+ map(0x0500, 0x0503).mirror(0x38fc).w(m_pit[3], FUNC(pit8253_device::write));
+ map(0x0600, 0x0600).select(0xf0).mirror(0x380f).w(FUNC(jx8p_synth_device::adc_w));
+}
+
+void jx8p_synth_device::device_add_mconfig(machine_config &config)
+{
+ I8031(config, m_synthcpu, 12_MHz_XTAL); // 8051-319 (EA tied to GND)
+ m_synthcpu->set_addrmap(AS_PROGRAM, &jx8p_synth_device::prog_map);
+ m_synthcpu->set_addrmap(AS_IO, &jx8p_synth_device::ext_map);
+
+ I8155(config, m_ramio, 0); // µPD8155HC
+ m_ramio->out_pa_callback().set(FUNC(jx8p_synth_device::prescale_w));
+
+ for (auto &pit : m_pit)
+ PIT8253(config, pit); // µPD8253C-2
+}
+
+void superjx_synth_device::device_add_mconfig(machine_config &config)
+{
+ I8031(config, m_synthcpu, 12_MHz_XTAL); // MBL8031AH-P-G
+ m_synthcpu->set_addrmap(AS_PROGRAM, &superjx_synth_device::prog_map);
+ m_synthcpu->set_addrmap(AS_IO, &superjx_synth_device::ext_map);
+
+ I8155(config, m_ramio, 0); // µPD8155HC-2
+ m_ramio->out_pa_callback().set(FUNC(superjx_synth_device::prescale_w));
+
+ for (auto &pit : m_pit)
+ PIT8254(config, pit); // M5M82C54 P-6-D-1
+}