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Diffstat (limited to 'src/devices/bus/pc8801/jmbx1.cpp')
-rw-r--r--src/devices/bus/pc8801/jmbx1.cpp58
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
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+// 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);
+}