diff options
Diffstat (limited to 'src/devices/bus/archimedes/podule/nexus.cpp')
-rw-r--r-- | src/devices/bus/archimedes/podule/nexus.cpp | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/src/devices/bus/archimedes/podule/nexus.cpp b/src/devices/bus/archimedes/podule/nexus.cpp new file mode 100644 index 00000000000..9ab8dd63d46 --- /dev/null +++ b/src/devices/bus/archimedes/podule/nexus.cpp @@ -0,0 +1,127 @@ +// license:BSD-3-Clause +// copyright-holders:Nigel Barnes +/********************************************************************** + + SJ Research Nexus Interface + + http://chrisacorns.computinghistory.org.uk/32bit_UpgradesH2Z/SJR_A300NexusI4.html + +**********************************************************************/ + +#include "emu.h" +#include "nexus.h" +//#include "machine/imsc012.h" + + +namespace { + +class arc_nexus_device : + public device_t, + public device_archimedes_podule_interface +{ +public: + // construction/destruction + arc_nexus_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock); + + static constexpr feature_type unemulated_features() { return feature::COMMS; } + +protected: + // device-level overrides + virtual void device_start() override; + virtual void device_reset() override; + + // optional information overrides + virtual void device_add_mconfig(machine_config &config) override; + virtual const tiny_rom_entry *device_rom_region() const override; + + // device_archimedes_podule_interface overrides + virtual void ioc_map(address_map &map) override; + virtual void memc_map(address_map &map) override; + +private: + required_memory_region m_podule_rom; + + u8 m_rom_page; +}; + + +void arc_nexus_device::ioc_map(address_map &map) +{ + map(0x0000, 0x03fff).lr8(NAME([this](offs_t offset) { return m_podule_rom->base()[offset | ((m_rom_page << 12) & 0x7000)]; })).umask32(0x000000ff); +} + +void arc_nexus_device::memc_map(address_map &map) +{ + map(0x0040, 0x0040).lrw8(NAME([this]() { return m_rom_page; }), NAME([this](u8 data) { m_rom_page = data; })); + //map(0x0060, 0x006f).rw("c012", FUNC(imsc012_device::read), FUNC(imsc012_device::write)).umask32(0x000000ff); +} + + +//------------------------------------------------- +// ROM( nexus ) +//------------------------------------------------- + +ROM_START( nexus ) + ROM_REGION(0x8000, "podule_rom", 0) + ROM_LOAD("a500_2.24.bin", 0x0000, 0x8000, CRC(5d857330) SHA1(4d1c8cf82fddde1e0772c475da1b3283986aa7d3)) +ROM_END + +const tiny_rom_entry *arc_nexus_device::device_rom_region() const +{ + return ROM_NAME( nexus ); +} + + +//------------------------------------------------- +// device_add_mconfig - add device configuration +//------------------------------------------------- + +void arc_nexus_device::device_add_mconfig(machine_config &config) +{ + //IMSC012(config, "c012", 5_MHz_XTAL); // INMOS IMSC012-P20S link adaptor +} + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// arc_nexus_device - constructor +//------------------------------------------------- + +arc_nexus_device::arc_nexus_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) + : device_t(mconfig, ARC_NEXUS_A500, tag, owner, clock) + , device_archimedes_podule_interface(mconfig, *this) + , m_podule_rom(*this, "podule_rom") + , m_rom_page(0) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void arc_nexus_device::device_start() +{ + save_item(NAME(m_rom_page)); +} + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void arc_nexus_device::device_reset() +{ + m_rom_page = 0xff; +} + +} // anonymous namespace + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +DEFINE_DEVICE_TYPE_PRIVATE(ARC_NEXUS_A500, device_archimedes_podule_interface, arc_nexus_device, "arc_nexus_a500", "SJ Research Nexus Interface (A500)") |