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-rw-r--r--src/devices/bus/archimedes/podule/nexus.cpp127
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
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+++ b/src/devices/bus/archimedes/podule/nexus.cpp
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+// 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)")