diff options
Diffstat (limited to 'src/devices/bus/pc8801/jmbx1.cpp')
-rw-r--r-- | src/devices/bus/pc8801/jmbx1.cpp | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/src/devices/bus/pc8801/jmbx1.cpp b/src/devices/bus/pc8801/jmbx1.cpp new file mode 100644 index 00000000000..c868a7e2c7b --- /dev/null +++ b/src/devices/bus/pc8801/jmbx1.cpp @@ -0,0 +1,58 @@ +// license:BSD-3-Clause +// copyright-holders:Angelo Salese +/************************************************************************************************** + + JMB-X1 sound card + + Used for PC-8001mkII/PC-8801 NRTDRV88J sound program + http://upd780c1.g1.xrea.com/pc-8001/j80-25.html + + TODO: + - Source claims it runs on INT3, but the vector that uses NRTDRV is clearly INT4. + Is it configurable? + +**************************************************************************************************/ + +#include "emu.h" +#include "jmbx1.h" + + +DEFINE_DEVICE_TYPE(JMBX1, jmbx1_device, "jmbx1", "JMB-X1 \"Sound Board X\"") + +jmbx1_device::jmbx1_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) + : pc8801_exp_device(mconfig, JMBX1, tag, owner, clock) + , m_opm1(*this, "opm1") + , m_opm2(*this, "opm2") + , m_ssg(*this, "ssg") +{ +} + +void jmbx1_device::io_map(address_map &map) +{ + map(0xc8, 0xc9).rw(m_opm1, FUNC(ym2151_device::read), FUNC(ym2151_device::write)); + map(0xca, 0xcb).rw(m_opm2, FUNC(ym2151_device::read), FUNC(ym2151_device::write)); + map(0xcc, 0xcd).w(m_ssg, FUNC(ym2149_device::address_data_w)); + map(0xcd, 0xcd).r(m_ssg, FUNC(ym2149_device::data_r)); +} + +void jmbx1_device::device_add_mconfig(machine_config &config) +{ + constexpr XTAL jmb_x1_clock = XTAL(8'000'000); + + // TODO: OPM mixing + // (SSG is mono) + // doesn't seem to have irq mask + YM2151(config, m_opm1, jmb_x1_clock / 2); + m_opm1->irq_handler().set(FUNC(jmbx1_device::int4_w)); + m_opm1->add_route(ALL_OUTPUTS, "^^lspeaker", 0.25); + m_opm1->add_route(ALL_OUTPUTS, "^^rspeaker", 0.25); + + YM2151(config, m_opm2, jmb_x1_clock / 2); + m_opm2->add_route(ALL_OUTPUTS, "^^lspeaker", 0.25); + m_opm2->add_route(ALL_OUTPUTS, "^^rspeaker", 0.25); + + YM2149(config, m_ssg, jmb_x1_clock / 4); + // TODO: adds a non-negligible DC offset, likely needs high pass filter + m_ssg->add_route(ALL_OUTPUTS, "^^lspeaker", 0.20); + m_ssg->add_route(ALL_OUTPUTS, "^^rspeaker", 0.20); +} |