diff options
Diffstat (limited to 'src/devices/bus/bbc/1mhzbus/beebopl.cpp')
-rw-r--r-- | src/devices/bus/bbc/1mhzbus/beebopl.cpp | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/src/devices/bus/bbc/1mhzbus/beebopl.cpp b/src/devices/bus/bbc/1mhzbus/beebopl.cpp new file mode 100644 index 00000000000..9c3db9ca6ff --- /dev/null +++ b/src/devices/bus/bbc/1mhzbus/beebopl.cpp @@ -0,0 +1,95 @@ +// license:BSD-3-Clause +// copyright-holders:Nigel Barnes +/********************************************************************** + + BeebOPL FM Synthesiser emulation + + https://github.com/JudgeBeeb/BeebOPL + +**********************************************************************/ + + +#include "emu.h" +#include "beebopl.h" +#include "speaker.h" + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +DEFINE_DEVICE_TYPE(BBC_BEEBOPL, bbc_beebopl_device, "beebopl", "BeebOPL FM Synthesiser") + + +//------------------------------------------------- +// device_add_mconfig - add device configuration +//------------------------------------------------- + +void bbc_beebopl_device::device_add_mconfig(machine_config &config) +{ + SPEAKER(config, "speaker").front_center(); + + YM3812(config, m_ym3812, 3.579_MHz_XTAL); + m_ym3812->irq_handler().set(DEVICE_SELF_OWNER, FUNC(bbc_1mhzbus_slot_device::irq_w)); + m_ym3812->add_route(ALL_OUTPUTS, "speaker", 1.0); + + BBC_1MHZBUS_SLOT(config, m_1mhzbus, DERIVED_CLOCK(1, 1), bbc_1mhzbus_devices, nullptr); + m_1mhzbus->irq_handler().set(DEVICE_SELF_OWNER, FUNC(bbc_1mhzbus_slot_device::irq_w)); + m_1mhzbus->nmi_handler().set(DEVICE_SELF_OWNER, FUNC(bbc_1mhzbus_slot_device::nmi_w)); +} + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// bbc_beebopl_device - constructor +//------------------------------------------------- + +bbc_beebopl_device::bbc_beebopl_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) + : device_t(mconfig, BBC_BEEBOPL, tag, owner, clock) + , device_bbc_1mhzbus_interface(mconfig, *this) + , m_1mhzbus(*this, "1mhzbus") + , m_ym3812(*this, "ym3812") +{ +} + + +//************************************************************************** +// IMPLEMENTATION +//************************************************************************** + +uint8_t bbc_beebopl_device::fred_r(offs_t offset) +{ + uint8_t data = 0xff; + + if ((offset & 0xfe) == 0x04) + { + data = m_ym3812->read(offset); + } + + data &= m_1mhzbus->fred_r(offset); + + return data; +} + +void bbc_beebopl_device::fred_w(offs_t offset, uint8_t data) +{ + if ((offset & 0xfe) == 0x04) + { + m_ym3812->write(offset, data); + } + + m_1mhzbus->fred_w(offset, data); +} + +uint8_t bbc_beebopl_device::jim_r(offs_t offset) +{ + return m_1mhzbus->jim_r(offset); +} + +void bbc_beebopl_device::jim_w(offs_t offset, uint8_t data) +{ + m_1mhzbus->jim_w(offset, data); +} |