diff options
Diffstat (limited to 'src/mame/audio/jx8p_synth.cpp')
-rw-r--r-- | src/mame/audio/jx8p_synth.cpp | 98 |
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 --- /dev/null +++ b/src/mame/audio/jx8p_synth.cpp @@ -0,0 +1,98 @@ +// 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 +} |