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-rw-r--r--src/devices/bus/archimedes/podule/rom.cpp231
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diff --git a/src/devices/bus/archimedes/podule/rom.cpp b/src/devices/bus/archimedes/podule/rom.cpp
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+++ b/src/devices/bus/archimedes/podule/rom.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ Acorn AKA05 ROM Podule
+
+ http://chrisacorns.computinghistory.org.uk/32bit_UpgradesA2G/Acorn_AKA05_ROMpodule.html
+
+**********************************************************************/
+
+#include "emu.h"
+#include "rom.h"
+#include "bus/generic/slot.h"
+#include "bus/generic/carts.h"
+#include "bus/generic/ram.h"
+#include "bus/generic/rom.h"
+#include "softlist_dev.h"
+
+
+namespace {
+
+class arc_rom_aka05_device :
+ public device_t,
+ public device_archimedes_podule_interface
+{
+public:
+ // construction/destruction
+ arc_rom_aka05_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+ static constexpr feature_type unemulated_features() { return feature::ROM; }
+
+protected:
+ arc_rom_aka05_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock);
+
+ // device_t 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;
+
+private:
+ required_memory_region m_podule_rom;
+ required_device_array<generic_slot_device, 8> m_rom;
+
+ u8 rom_r(offs_t offset);
+ void rom_w(offs_t offset, u8 data);
+
+ u8 m_rom_select;
+ u8 m_rom_page;
+};
+
+// ======================> arc_rom_r225_device
+
+class arc_rom_r225_device : public arc_rom_aka05_device
+{
+public:
+ // construction/destruction
+ arc_rom_r225_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+protected:
+ // optional information overrides
+ virtual const tiny_rom_entry *device_rom_region() const override;
+};
+
+
+void arc_rom_aka05_device::ioc_map(address_map &map)
+{
+ map(0x0000, 0x1fff).rw(FUNC(arc_rom_aka05_device::rom_r), FUNC(arc_rom_aka05_device::rom_w)).umask32(0x000000ff);
+ map(0x2000, 0x2fff).lw8(NAME([this](u8 data) { m_rom_page = data & 0x3f; m_rom_select = (m_rom_select & 0x04) | ((data >> 6) & 0x03); })).umask32(0x000000ff);
+ map(0x3000, 0x37ff).lw8(NAME([this](u8 data) { m_rom_select &= ~0x04; })).umask32(0x000000ff);
+ map(0x3800, 0x3fff).lw8(NAME([this](u8 data) { m_rom_select |= 0x04; })).umask32(0x000000ff);
+}
+
+
+//-------------------------------------------------
+// ROM( rom )
+//-------------------------------------------------
+
+ROM_START( rom_aka05 )
+ ROM_REGION(0x20000, "podule_rom", ROMREGION_ERASEFF)
+ ROM_SYSTEM_BIOS(0, "2", "Second release 18-Dec-87")
+ ROMX_LOAD("0276,221-02_manager.bin", 0x0000, 0x4000, CRC(23ec4ddb) SHA1(e699157895433010b1ea110c78fbc80a4bc58f09), ROM_BIOS(0))
+ROM_END
+
+ROM_START( rom_r225 )
+ ROM_REGION(0x40000, "podule_rom", ROMREGION_ERASEFF)
+ ROM_LOAD("0270,751-01_r225_boot_rom1.bin", 0x00000, 0x20000, CRC(69117329) SHA1(3ce1a3630bc5d3475216cc403df348f55cad681a))
+ ROM_LOAD("0270,752-01_r225_boot_rom2.bin", 0x20000, 0x20000, CRC(2756ee10) SHA1(bb0825670bde59c80a73895141b2d8ad6ea87a2f))
+ROM_END
+
+const tiny_rom_entry *arc_rom_aka05_device::device_rom_region() const
+{
+ return ROM_NAME( rom_aka05 );
+}
+
+const tiny_rom_entry *arc_rom_r225_device::device_rom_region() const
+{
+ return ROM_NAME( rom_r225 );
+}
+
+
+void arc_ram_devices(device_slot_interface &device)
+{
+ device.option_add("ram", GENERIC_RAM_32K_PLAIN);
+}
+
+//-------------------------------------------------
+// device_add_mconfig - add device configuration
+//-------------------------------------------------
+
+void arc_rom_aka05_device::device_add_mconfig(machine_config &config)
+{
+ // rom sockets 6 x 128K
+ GENERIC_SOCKET(config, m_rom[0], generic_plain_slot, "bbc_rom", "bin,rom");
+ GENERIC_SOCKET(config, m_rom[1], generic_plain_slot, "bbc_rom", "bin,rom");
+ GENERIC_SOCKET(config, m_rom[2], generic_plain_slot, "bbc_rom", "bin,rom");
+ GENERIC_SOCKET(config, m_rom[3], generic_plain_slot, "bbc_rom", "bin,rom");
+ GENERIC_SOCKET(config, m_rom[4], generic_plain_slot, "bbc_rom", "bin,rom");
+ GENERIC_SOCKET(config, m_rom[5], generic_plain_slot, "bbc_rom", "bin,rom");
+
+ // ram sockets 2 x 32K
+ GENERIC_SOCKET(config, m_rom[6], arc_ram_devices, "bbc_rom", "bin,rom").set_user_loadable(false);
+ GENERIC_SOCKET(config, m_rom[7], arc_ram_devices, "bbc_rom", "bin,rom").set_user_loadable(false);
+
+ SOFTWARE_LIST(config, "rom_ls").set_original("bbc_rom").set_filter("B");
+}
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// arc_rom_aka05_device - constructor
+//-------------------------------------------------
+
+arc_rom_aka05_device::arc_rom_aka05_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock)
+ : device_t(mconfig, type, tag, owner, clock)
+ , device_archimedes_podule_interface(mconfig, *this)
+ , m_podule_rom(*this, "podule_rom")
+ , m_rom(*this, "rom%u", 1U)
+ , m_rom_select(0)
+ , m_rom_page(0)
+{
+}
+
+arc_rom_aka05_device::arc_rom_aka05_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : arc_rom_aka05_device(mconfig, ARC_ROM_AKA05, tag, owner, clock)
+{
+}
+
+arc_rom_r225_device::arc_rom_r225_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : arc_rom_aka05_device(mconfig, ARC_ROM_R225, tag, owner, clock)
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void arc_rom_aka05_device::device_start()
+{
+ save_item(NAME(m_rom_select));
+ save_item(NAME(m_rom_page));
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void arc_rom_aka05_device::device_reset()
+{
+ m_rom_select = 0x00;
+ m_rom_page = 0x00;
+}
+
+
+//**************************************************************************
+// IMPLEMENTATION
+//**************************************************************************
+
+u8 arc_rom_aka05_device::rom_r(offs_t offset)
+{
+ u8 data = 0xff;
+ u32 const addr = offset | (m_rom_page << 11);
+
+ switch (m_rom_select)
+ {
+ case 0: case 1: case 2: case 3: case 4: case 5:
+ if ((m_rom_select * 0x20000) < m_podule_rom->bytes())
+ data = m_podule_rom->base()[(m_rom_select * 0x20000) | addr];
+ else
+ data = m_rom[m_rom_select]->read_rom(addr);
+ break;
+
+ case 6: case 7:
+ data = m_rom[m_rom_select]->read_ram(addr);
+ break;
+ }
+
+ return data;
+}
+
+void arc_rom_aka05_device::rom_w(offs_t offset, u8 data)
+{
+ u32 const addr = offset | (m_rom_page << 11);
+
+ switch (m_rom_select)
+ {
+ case 6: case 7:
+ m_rom[m_rom_select]->write_ram(addr, data);
+ break;
+ }
+}
+
+} // anonymous namespace
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE_PRIVATE(ARC_ROM_AKA05, device_archimedes_podule_interface, arc_rom_aka05_device, "arc_rom_aka05", "Acorn AKA05 ROM Podule")
+DEFINE_DEVICE_TYPE_PRIVATE(ARC_ROM_R225, device_archimedes_podule_interface, arc_rom_r225_device, "arc_rom_r225", "Acorn AKA05 ROM (with DiscLess Bootstrap support)")